JEE Main 2024 Apr 5 Shift 2 — Question Paper

Let the set $S = \{2, 4, 8, 16, \ldots, 512\}$ be partitioned into 3 sets $A$, $B$, $C$ with equal number of elements such that $A \cup B \cup C = S$ and $A \cap B = B \cap C = A \cap C = \phi$. The maximum number of such possible partitions of $S$ is equal to :

Let $f, g : \mathbf{R} \rightarrow \mathbf{R}$ be defined as :

$f(x) = |x - 1|$ and $g(x) = \begin{cases} \mathrm{e}^{x}, & x \geq 0 \\ x + 1, & x \leq 0. \end{cases}$

Then the function $f(g(x))$ is

Let $S_1 = \{z \in \mathbf{C} : |z| \leq 5\}$, $S_2 = \left\{z \in \mathbf{C} : \operatorname{Im}\left(\dfrac{z + 1 - \sqrt{3}\,i}{1 - \sqrt{3}\,i}\right) \geq 0\right\}$ and $S_3 = \{z \in \mathbf{C} : \operatorname{Re}(z) \geq 0\}$. Then the area of the region $S_1 \cap S_2 \cap S_3$ is :

The values of $m$, $n$, for which the system of equations

$x + y + z = 4$,

$2x + 5y + 5z = 17$,

$x + 2y + mz = n$

has infinitely many solutions, satisfy the equation :

Let $\alpha\beta \neq 0$ and $A = \begin{bmatrix} \beta & \alpha & 3 \\ \alpha & \alpha & \beta \\ -\beta & \alpha & 2\alpha \end{bmatrix}$. If $B = \begin{bmatrix} 3\alpha & -9 & 3\alpha \\ -\alpha & 7 & -2\alpha \\ -2\alpha & 5 & -2\beta \end{bmatrix}$ is the matrix of cofactors of the elements of $A$, then $\det(AB)$ is equal to :

60 words can be made using all the letters of the word BHBJO, with or without meaning. If these words are written as in a dictionary, then the $50^{\text{th}}$ word is :

The coefficients $a$, $b$, $c$ in the quadratic equation $ax^2 + bx + c = 0$ are from the set $\{1, 2, 3, 4, 5, 6\}$. If the probability of this equation having one real root bigger than the other is $p$, then $216p$ equals :

For $x \geq 0$, the least value of $K$, for which $4^{1+x} + 4^{1-x}$, $\dfrac{K}{2}$, $16^x + 16^{-x}$ are three consecutive terms of an A.P., is equal to :

If the constant term in the expansion of $\left(\dfrac{\sqrt[5]{3}}{x} + \dfrac{2x}{\sqrt[3]{5}}\right)^{12}$, $x \neq 0$, is $\alpha \times 2^8 \times \sqrt[5]{3}$, then $25\alpha$ is equal to :

Let $f : [-1, 2] \rightarrow \mathbf{R}$ be given by $f(x) = 2x^2 + x + [x^2] - [x]$, where $[t]$ denotes the greatest integer less than or equal to $t$. The number of points, where $f$ is not continuous, is :

Let $\beta(m, n) = \displaystyle\int_0^1 x^{m-1}(1-x)^{n-1}\,\mathrm{d}x$, $m, n > 0$. If $\displaystyle\int_0^1 (1 - x^{10})^{20}\,\mathrm{d}x = a \times \beta(b, c)$, then $100(a + b + c)$ equals ________.

The area enclosed between the curves $y = x|x|$ and $y = x - |x|$ is :

The differential equation of the family of circles passing through the origin and having centre at the line $y = x$ is :

Let ABCD and AEFG be squares of side 4 and 2 units, respectively. The point E is on the line segment AB and the point F is on the diagonal AC. Then the radius $r$ of the circle passing through the point F and touching the line segments BC and CD satisfies :

Let the circle $C_1 : x^2 + y^2 - 2(x + y) + 1 = 0$ and $C_2$ be a circle having centre at $(-1, 0)$ and radius 2. If the line of the common chord of $C_1$ and $C_2$ intersects the $y$-axis at the point P, then the square of the distance of P from the centre of $C_1$ is :

Let $A(-1, 1)$ and $B(2, 3)$ be two points and P be a variable point above the line AB such that the area of $\triangle PAB$ is 10. If the locus of P is $ax + by = 15$, then $5a + 2b$ is :

Let $(\alpha, \beta, \gamma)$ be the image of the point $(8, 5, 7)$ in the line $\dfrac{x-1}{2} = \dfrac{y+1}{3} = \dfrac{z-2}{5}$. Then $\alpha + \beta + \gamma$ is equal to :

Let $\vec{a} = 2\hat{i} + 5\hat{j} - \hat{k}$, $\vec{b} = 2\hat{i} - 2\hat{j} + 2\hat{k}$ and $\vec{c}$ be three vectors such that $(\vec{c} + \hat{i}) \times (\vec{a} + \vec{b} + \hat{i}) = \vec{a} \times (\vec{c} + \hat{i})$. If $\vec{a} \cdot \vec{c} = -29$, then $\vec{c} \cdot (-2\hat{i} + \hat{j} + \hat{k})$ is equal to :

Consider three vectors $\vec{a}, \vec{b}, \vec{c}$. Let $|\vec{a}| = 2$, $|\vec{b}| = 3$ and $\vec{a} = \vec{b} \times \vec{c}$. If $\alpha \in \left[0, \dfrac{\pi}{3}\right]$ is the angle between the vectors $\vec{b}$ and $\vec{c}$, then the minimum value of $27|\vec{c} - \vec{a}|^2$ is equal to :

If $y(\theta) = \dfrac{2\cos\theta + \cos 2\theta}{\cos 3\theta + 4\cos 2\theta + 5\cos\theta + 2}$, then at $\theta = \dfrac{\pi}{2}$, $y'' + y' + y$ is equal to :

The number of solutions of $\sin^2 x + (2 + 2x - x^2)\sin x - 3(x - 1)^2 = 0$, where $-\pi \leq x \leq \pi$, is ________.

If $1 + \dfrac{\sqrt{3} - \sqrt{2}}{2\sqrt{3}} + \dfrac{5 - 2\sqrt{6}}{18} + \dfrac{9\sqrt{3} - 11\sqrt{2}}{36\sqrt{3}} + \dfrac{49 - 20\sqrt{6}}{180} + \ldots \text{upto } \infty = 2 + \left(\sqrt{\dfrac{b}{a}} + 1\right)\log_{\mathrm{e}}\left(\dfrac{a}{b}\right)$, where $a$ and $b$ are integers with $\gcd(a, b) = 1$, then $11a + 18b$ is equal to ________.

Let $a > 0$ be a root of the equation $2x^2 + x - 2 = 0$. If $\lim\limits_{x \to \frac{1}{a}} \dfrac{16\left(1 - \cos(2 + x - 2x^2)\right)}{(1 - ax)^2} = \alpha + \beta\sqrt{17}$, where $\alpha, \beta \in \mathbb{Z}$, then $\alpha + \beta$ is equal to ________.

Let the maximum and minimum values of $\left(\sqrt{8x - x^2 - 12} - 4\right)^2 + (x - 7)^2$, $x \in \mathbf{R}$ be $M$ and $m$, respectively. Then $M^2 - m^2$ is equal to ________.

If $f(t) = \displaystyle\int_0^{\pi} \dfrac{2x\,\mathrm{d}x}{1 - \cos^2 t \sin^2 x}$, $0 < t < \pi$, then the value of $\displaystyle\int_0^{\frac{\pi}{2}} \dfrac{\pi^2\,\mathrm{d}t}{f(t)}$ equals ________.

Let $y = y(x)$ be the solution of the differential equation

$$\dfrac{\mathrm{d}y}{\mathrm{d}x} + \dfrac{2x}{(1 + x^2)^2}\,y = x\,\mathrm{e}^{\frac{1}{(1 + x^2)}};\ y(0) = 0.$$

Then the area enclosed by the curve $f(x) = y(x)\,\mathrm{e}^{-\frac{1}{(1 + x^2)}}$ and the line $y - x = 4$ is ________.

Let a line perpendicular to the line $2x - y = 10$ touch the parabola $y^2 = 4(x - 9)$ at the point P. The distance of the point P from the centre of the circle $x^2 + y^2 - 14x - 8y + 56 = 0$ is ________.

Let the point $(-1, \alpha, \beta)$ lie on the line of the shortest distance between the lines $\dfrac{x + 2}{-3} = \dfrac{y - 2}{4} = \dfrac{z - 5}{2}$ and $\dfrac{x + 2}{-1} = \dfrac{y + 6}{2} = \dfrac{z - 1}{0}$. Then $(\alpha - \beta)^2$ is equal to ________.

Let the mean and the standard deviation of the probability distribution

$X$	$\alpha$	$1$	$0$	$-3$
$P(X)$	$\dfrac{1}{3}$	$K$	$\dfrac{1}{6}$	$\dfrac{1}{4}$

be $\mu$ and $\sigma$, respectively. If $\sigma - \mu = 2$, then $\sigma + \mu$ is equal to ________.

The number of real solutions of the equation $x|x + 5| + 2|x + 7| - 2 = 0$ is ________.

What is the dimensional formula of $ab^{-1}$ in the equation $\left(P + \frac{a}{V^2}\right)(V - b) = RT$, where letters have their usual meaning.

A man carrying a monkey on his shoulder does cycling smoothly on a circular track of radius $9\ \mathrm{m}$ and completes 120 resolutions in 3 minutes. The magnitude of centripetal acceleration of monkey is (in $\mathrm{m/s^2}$) :

A heavy box of mass 50 kg is moving on a horizontal surface. If co-efficient of kinetic friction between the box and horizontal surface is 0.3 then force of kinetic friction is :

A particle moves in $x$-$y$ plane under the influence of a force $\vec{F}$ such that its linear momentum is $\vec{p}(t) = \hat{i}\cos(kt) - \hat{j}\sin(kt)$. If $k$ is constant, the angle between $\vec{F}$ and $\vec{P}$ will be :

A body is moving unidirectionally under the influence of a constant power source. Its displacement in time t is proportional to :

A vernier callipers has 20 divisions on the vernier scale, which coincides with $19^{\text{th}}$ division on the main scale. The least count of the instrument is 0.1 mm. One main scale division is equal to ________ mm.

A satellite revolving around a planet in stationary orbit has time period 6 hours. The mass of planet is one-fourth the mass of earth. The radius orbit of planet is :

(Given = Radius of geo-stationary orbit for earth is $4.2 \times 10^4\ \mathrm{km}$)

Match List-I with List-II :

List-I	List-II
(A) A force that restores an elastic body of unit area to its original state	(I) Bulk modulus
(B) Two equal and opposite forces parallel to opposite faces	(II) Young's modulus
(C) Forces perpendicular everywhere to the surface per unit area same everywhere	(III) Stress
(D) Two equal and opposite forces perpendicular to opposite faces	(IV) Shear modulus

Choose the correct answer from the options given below :

If n is the number density and d is the diameter of the molecule, then the average distance covered by a molecule between two successive collisions (i.e. mean free path) is represented by :

The vehicles carrying inflammable fluids usually have metallic chains touching the ground :

A series LCR circuit is subjected to an ac signal of 200 V, 50 Hz. If the voltage across the inductor ($L = 10\ \mathrm{mH}$) is 31.4 V, then the current in this circuit is ________.

The ratio of heat dissipated per second through the resistance $5\ \Omega$ and $10\ \Omega$ in the circuit given below is :

[Figure: a 10 V battery connected to a $20\ \Omega$ resistor in series with a parallel combination of $5\ \Omega$ and $10\ \Omega$ resistors]

The electrostatic force $\left(\vec{F}_1\right)$ and magnetic force $\left(\vec{F}_2\right)$ acting on a charge q moving with velocity $v$ can be written :

Match List-I with List-II :

List-I (EM-Wave)	List-II (Wavelength Range)
(A) Infra-red	(I) $< 10^{-3}$ nm
(B) Ultraviolet	(II) 400 nm to 1 nm
(C) X-rays	(III) 1 mm to 700 nm
(D) Gamma rays	(IV) 1 nm to $10^{-3}$ nm

Choose the correct answer from the options given below :

Given below are two statements :

Statement I : When the white light passed through a prism, the red light bends lesser than yellow and violet.

Statement II : The refractive indices are different for different wavelengths in dispersive medium.

In the light of the above statements, chose the correct answer from the options given below :

A galvanometer of resistance $100\ \Omega$ when connected in series with $400\ \Omega$ measures a voltage of upto 10 V. The value of resistance required to convert the galvanometer into ammeter to read upto 10 A is $x \times 10^{-2}\ \Omega$. The value of $x$ is :

Which of the following statement is not true about stopping potential $(V_0)$ ?

The angular momentum of an electron in a hydrogen atom is proportional to : (Where r is the radius of orbit of electron)

During an adiabatic process, if the pressure of a gas is found to be proportional to the cube of its absolute temperature, then the ratio of $\frac{C_P}{C_V}$ for the gas is :

The output (Y) of logic circuit given below is 0 only when :

[Figure: logic circuit — inputs A and B feed an OR gate; input B and a constant input 1 feed an AND gate; the outputs of the OR gate and the AND gate feed a final OR gate whose output is Y]

The maximum height reached by a projectile is 64 m. If the initial velocity is halved, the new maximum height of the projectile is ________ m.

A hollow sphere is rolling on a plane surface about its axis of symmetry. The ratio of rotational kinetic energy to its total kinetic energy is $\frac{x}{5}$. The value of $x$ is ________.

In a single slit experiment, a parallel beam of green light of wavelength 550 nm passes through a slit of width 0.20 mm. The transmitted light is collected on a screen 100 cm away. The distance of first order minima from the central maximum will be $x \times 10^{-5}$ m. The value of $x$ is :

A hydraulic press containing water has two arms with diameters as mentioned in the figure. A force of 10 N is applied on the surface of water in the thinner arm. The force required to be applied on the surface of water in the thicker arm to maintain equilibrium of water is ________ N.

[Figure: a U-shaped hydraulic press — the wider arm has diameter 14 cm; the thinner arm has diameter 1.4 cm with a 10 N force applied downward on it]

A sonometer wire of resonating length 90 cm has a fundamental frequency of 400 Hz when kept under some tension. The resonating length of the wire with fundamental frequency of 600 Hz under same tension ________ cm.

A wire of resistance $20\ \Omega$ is divided into 10 equal parts, resulting pairs. A combination of two parts are connected in parallel and so on. Now resulting pairs of parallel combination are connected in series. The equivalent resistance of final combination is ________ $\Omega$.

A solenoid of length 0.5 m has a radius of 1 cm and is made up of 'm' number of turns. It carries a current of 5 A. If the magnitude of the magnetic field inside the solenoid is $6.28 \times 10^{-3}\ \mathrm{T}$ then the value of m is ________.

The electric field at point p due to an electric dipole is E. The electric field at point R on equitorial line will be $\frac{E}{x}$. The value of $x$ :

[Figure: a dipole with $-q$ and $+q$ on a horizontal axis about origin O; point p lies on the axial line at distance r from O; point Q lies on the equatorial (perpendicular) line at distance r from O and point R at distance 2r from O]

The current in an inductor is given by $I = (3t + 8)$ where t is in second. The magnitude of induced emf produced in the inductor is 12 mV. The self-inductance of the inductor ________ mH.

The shortest wavelength of the spectral lines in the Lyman series of hydrogen spectrum is $915\ \mathrm{\mathring{A}}$. The longest wavelength of spectral lines in the Balmer series will be ________ $\mathrm{\mathring{A}}$.

The number of moles of methane required to produce $11 \mathrm{~g} \mathrm{~CO_2(g)}$ after complete combustion is : (Given molar mass of methane in $\mathrm{g} \mathrm{~mol}^{-1}$ : 16)

Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R).

Assertion (A) : $\mathrm{NH_3}$ and $\mathrm{NF_3}$ molecule have pyramidal shape with a lone pair of electrons on nitrogen atom. The resultant dipole moment of $\mathrm{NH_3}$ is greater than that of $\mathrm{NF_3}$.

Reason (R) : In $\mathrm{NH_3}$, the orbital dipole due to lone pair is in the same direction as the resultant dipole moment of the $\mathrm{N-H}$ bonds. F is the most electronegative element.

In the light of the above statements, choose the correct answer from the options given below :

Given below are two statements :

Statement I : On passing $\mathrm{HCl_{(g)}}$ through a saturated solution of $\mathrm{BaCl_2}$, at room temperature white turbidity appears.

Statement II : When HCl gas is passed through a saturated solution of NaCl, sodium chloride is precipitated due to common ion effect.

In the light of the above statements, choose the most appropriate answer from the options given below :

For the electro chemical cell

$$\mathrm{M | M^{2+} \| X | X^{2-}}$$

If $\mathrm{E^0_{(M^{2+}/M)}} = 0.46 \mathrm{~V}$ and $\mathrm{E^0_{(X/X^{2-})}} = 0.34 \mathrm{~V}$.

Which of the following is correct ?

The quantity of silver deposited when one coulomb charge is passed through $\mathrm{AgNO_3}$ solution :

Given below are two statements :

Statement I : The metallic radius of Na is $1.86 \mathrm{~\mathring{A}}$ and the ionic radius of $\mathrm{Na^+}$ is lesser than $1.86 \mathrm{~\mathring{A}}$.

Statement II : Ions are always smaller in size than the corresponding elements.

In the light of the above statements, choose the correct answer from the options given below :

Match List - I with List - II.

List - I	List - II
(A) $\mathrm{ICl}$	(I) T - shape
(B) $\mathrm{ICl_3}$	(II) Square pyramidal
(C) $\mathrm{ClF_5}$	(III) Pentagonal bipyramidal
(D) $\mathrm{IF_7}$	(IV) Linear

Choose the correct answer from the options given below :

The correct statements from the following are :

(A) The decreasing order of atomic radii of group 13 elements is $\mathrm{Tl > In > Ga > Al > B}$.

(B) Down the group 13 electronegativity decreases from top to bottom.

(C) Al dissolves in dil. HCl and liberates $\mathrm{H_2}$ but conc. $\mathrm{HNO_3}$ renders Al passive by forming a protective oxide layer on the surface.

(D) All elements of group 13 exhibits highly stable $+1$ oxidation state.

(E) Hybridisation of Al in $\mathrm{[Al(H_2O)_6]^{3+}}$ ion is $\mathrm{sp^3d^2}$.

Choose the correct answer from the options given below :

The number of ions from the following that have the ability to liberate hydrogen from a dilute acid is ________.

$\mathrm{Ti^{2+}}$, $\mathrm{Cr^{2+}}$ and $\mathrm{V^{2+}}$

The metal atom present in the complex MABXL (where A, B, X and L are unidentate ligands and M is metal) involves $\mathrm{sp^3}$ hybridization. The number of geometrical isomers exhibited by the complex is :

The number of complexes from the following with no electrons in the $\mathrm{t_2}$ orbital is ________.

$\mathrm{TiCl_4}$, $\mathrm{[MnO_4]^-}$, $\mathrm{[FeO_4]^{2-}}$, $\mathrm{[FeCl_4]^-}$, $\mathrm{[CoCl_4]^{2-}}$

While preparing crystals of Mohr's salt, dil $\mathrm{H_2SO_4}$ is added to a mixture of ferrous sulphate and ammonium sulphate, before dissolving this mixture in water, dil $\mathrm{H_2SO_4}$ is added here to :

The correct nomenclature for the following compound is :

[Figure: a seven-carbon chain bearing a $-\mathrm{COOH}$ group and a $-\mathrm{CHO}$ group on C-2, an $-\mathrm{OH}$ group on C-4, and a terminal $\mathrm{CH_2{=}CH-}$ double bond at the chain end; i.e. $\mathrm{CH_2{=}CH-CH_2-CH(OH)-CH_2-CH(CHO)-COOH}$]

Match List - I with List - II.

List - I (Pair of Compounds)	List - II (Isomerism)
(A) n-propanol and Isopropanol	(I) Metamerism
(B) Methoxypropane and ethoxyethane	(II) Chain Isomerism
(C) Propanone and propanal	(III) Position Isomerism
(D) Neopentane and Isopentane	(IV) Functional Isomerism

Choose the correct answer from the options given below :

Identify A and B in the given chemical reaction sequence :

[Figure: benzene $\xrightarrow{\text{succinic anhydride, } \mathrm{AlCl_3}}$ A $\xrightarrow[\mathrm{HCl}]{\mathrm{Zn-Hg}}$ B $\xrightarrow{\mathrm{H^+}}$ 3,4-dihydronaphthalen-1(2H)-one ($\alpha$-tetralone)]

Which one of the following reactions is NOT possible ?

Identify the major product in the following reaction.

[Figure: 1-bromo-1-methylcyclopentane $\xrightarrow[\mathrm{C_2H_5OH}]{\bar{\mathrm{O}}\mathrm{H}}$ Major Product]

$$\mathrm{CH_3CH_2{-}OH} \xrightarrow[\substack{\text{(ii) } \mathrm{KMnO_4} \\ \text{(iii) } \mathrm{NaOH, CaO, \Delta}}]{\text{(i) Jone's Reagent}} \mathrm{P}$$

Consider the above reaction sequence and identify the major product P.

Consider the given chemical reaction :

[Figure: cyclohexene $\xrightarrow[\text{Heat}]{\mathrm{KMnO_4 - H_2SO_4}}$ Product "A"]

Product "A" is :

Coagulation of egg, on heating is because of :

In an atom, total number of electrons having quantum numbers $n = 4$, $|m_l| = 1$ and $m_s = -\frac{1}{2}$ is ________.

Number of compounds from the following with zero dipole moment is ________.

$\mathrm{HF}$, $\mathrm{H_2}$, $\mathrm{H_2S}$, $\mathrm{CO_2}$, $\mathrm{NH_3}$, $\mathrm{BF_3}$, $\mathrm{CH_4}$, $\mathrm{CHCl_3}$, $\mathrm{SiF_4}$, $\mathrm{H_2O}$, $\mathrm{BeF_2}$

Combustion of 1 mole of benzene is expressed at

$$\mathrm{C_6H_6(l) + \frac{15}{2} O_2(g) \rightarrow 6\,CO_2(g) + 3\,H_2O(l)}.$$

The standard enthalpy of combustion of 2 mol of benzene is $-\,'x'$ kJ.

$x =$ ________.

Given :

1. standard Enthalpy of formation of 1 mol of $\mathrm{C_6H_6(l)}$, for the reaction $\mathrm{6\,C\,(graphite) + 3\,H_2(g) \rightarrow C_6H_6(l)}$ is $48.5 \mathrm{~kJ} \mathrm{~mol}^{-1}$.

2. Standard Enthalpy of formation of 1 mol of $\mathrm{CO_2(g)}$, for the reaction $\mathrm{C\,(graphite) + O_2(g) \rightarrow CO_2(g)}$ is $-393.5 \mathrm{~kJ} \mathrm{~mol}^{-1}$.

3. Standard and Enthalpy of formation of 1 mol of $\mathrm{H_2O(l)}$, for the reaction $\mathrm{H_2(g) + \frac{1}{2} O_2(g) \rightarrow H_2O\,(l)}$ is $-286 \mathrm{~kJ} \mathrm{~mol}^{-1}$.

Considering acetic acid dissociates in water, its dissociation constant is $6.25 \times 10^{-5}$. If 5 mL of acetic acid is dissolved in 1 litre water, the solution will freeze at $-x \times 10^{-2}\,°\mathrm{C}$, provided pure water freezes at $0\,°\mathrm{C}$.

$x =$ ________. (Nearest integer)

Given : $(\mathrm{K}_f)_{\text{water}} = 1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$.

density of acetic acid is $1.2 \mathrm{~g} \mathrm{~mol}^{-1}$.

molar mass of water $= 18 \mathrm{~g} \mathrm{~mol}^{-1}$.

molar mass of acetic acid $= 60 \mathrm{~g} \mathrm{~mol}^{-1}$.

density of water $= 1 \mathrm{~g} \mathrm{~cm}^{-3}$

Acetic acid dissociates as $\mathrm{CH_3COOH \rightleftharpoons CH_3COO^{\ominus} + H^{\oplus}}$

Consider the following single step reaction in gas phase at constant temperature.

$$\mathrm{2A_{(g)} + B_{(g)} \rightarrow C_{(g)}}$$

The initial rate of the reaction is recorded as $r_1$ when the reaction starts with 1.5 atm pressure of A and 0.7 atm pressure of B. After some time, the rate $r_2$ is recorded when the pressure of C becomes 0.5 atm. The ratio $r_1 : r_2$ is ________ $\times 10^{-1}$. (Nearest integer)

The fusion of chromite ore with sodium carbonate in the presence of air leads to the formation of products A and B along with the evolution of $\mathrm{CO_2}$. The sum of spin-only magnetic moment values of A and B is ________ B.M. (Nearest integer)

[Given atomic number : C : 6, Na : 11, O : 8, Fe : 26, Cr : 24]

In the Claisen-Schmidt reaction to prepare 351 g of dibenzalacetone using 87 g of acetone, the amount of benzaldehyde required is ________ g. (Nearest integer)

Using the given figure, the ratio of $R_f$ values of sample A and sample C is $x \times 10^{-2}$. Value of $x$ is ________.

[Figure: paper chromatography of samples (A, B, C) — base line at 0.0 cm, sample A spot at 5.0 cm, sample B spot at 6.5 cm, sample C spot at 10.0 cm, solvent front at 12.5 cm]

The product $\mathrm{(C)}$ in the following sequence of reactions has ________ $\pi$ bonds.

[Figure: propylbenzene ($\mathrm{C_6H_5{-}CH_2CH_2CH_3}$) $\xrightarrow[\Delta]{\mathrm{KMnO_4 - KOH}}$ (A) $\xrightarrow{\mathrm{H_3O^+}}$ (B) $\xrightarrow[\mathrm{FeBr_3}]{\mathrm{Br_2}}$ (C)]

X g of ethanamine was subjected to reaction with $\mathrm{NaNO_2/HCl}$ followed by hydrolysis to liberate $\mathrm{N_2}$ and HCl. The HCl generated was completely neutralised by 0.2 moles of NaOH. X is ________ g.