NTA JEE Mains 23rd Jan 2026 Shift 2 - Chemistry

Given above is the concentration vs time plot for a dissociation reaction : $$A \rightarrow nB$$ .
Based on the data of the initial phase of the reaction (initial 10 min), the value of n is________.

It is noticed that $$Pb^{2+}$$ is more stable than $$Pb^{4+}$$ but $$Sn^{2+}$$ is less stable than $$Sn^{4+}$$
Observe the following reactions.

$$ PbO_2+Pb\rightarrow 2PbO;\triangle_rG^{o}(1) $$
$$ SnO_2+Sn\rightarrow 2SnO;\triangle_rG^{o}(2) $$

Identify the correct set from the following

Elements X and Y belong to Group 15 . The difference between the electronegativity values of 'X' and phosphorus is higher than that of the difference between phosphorus and 'Y'. 'X' & 'Y' are respectively

Given below are two statements:

Statement I: The second ionisation enthalpy of Na is larger than the corresponding ionisation enthalpy of Mg.

Statement II: The ionic radius of $$O^{2-}$$ is larger than that of $$F^{-}$$.

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

Both human DNA and RNA are chiral molecules. The chirality in DNA and RNA arises due to the presence of

A mixed ether (P), when heated with excess of hot concentrated hydrogen iodide produces two different alkyl iodides which when treated with aq. NaOH give compounds (Q) and (R). Both (Q) and (R) give yellow precipitate with NaOI. Identify the mixed ether (P):

Identify the CORRECT set of details from the following:

A. $$[Co(NH_3)_6]^{3+}$$ : Inner orbital compex; $$d^{2}sp^{3}$$ hybridized

B. $$[MnCl_6]^{3-}$$ : Outer orbital complex; $$sp^{3}d^{2}$$ hybridized

C. $$[CoF_6]^{3-}$$ : Outer orbital complex; $$d^{2}sp^{3}$$ hybridized

D. $$[FeF_6]^{3-}$$ : Outer orbital complex; $$sp^{3}d^{2}$$ hybridized

E. $$[Ni(CN)_4]^{2-}$$ : Inner orbital complex; $$sp^{3}d^{2}$$ hybridized

Choose the correct answer from the options given below:

A student has been given a compound "x" of molecular formula- $$C_{6}H_{7}N$$. 'x' is sparingly soluble in water. However, on addition of dilute mineral acid, 'x' becomes soluble in water. 'x' when treated with $$CHCl_{3}$$ and KOH(alc), 'Y' is produced. 'y' has a specific unpleasant smell. On treatment with benzenesulphonyl chloride, 'x' gives a compound 'z' which is soluble in alkali. The number of different "H" atoms present in 'z' is :-

Iodoform test can differentiate between

A. Methanol and Ethanol
B. $$CH_{3}COOH$$ and $$CH_{3}CH_{2}COOH$$
C. Cyclohexene and cyclohexanone
D. Diethyl ether and Pentan-3-one
E. Anisole and acetone

Choose the correct answer from the options given below:

The work functions of two metals ($$M_{A}$$ and $$M_{B}$$ ) are in the 1 : 2 ratio. When these metals are exposed to photons of energy 6 eV, the kinetic energy of liberated electrons of $$M_{A}$$ : $$M_{B}$$ is in the ratio of 2.642 : 1. The work functions (in eV) of $$M_{A}$$ and $$M_{A}$$ are respectively.

Identify the INCORRECT statements from the following:

A. Notation $$_{12}^{24}Mg$$ represents 24 protons and 12 neutrons.
B. Wavelength of a radiation of frequency $$ 4.5\times10^{15}s^{-1} $$ is $$ 6.7\times10^{-8} $$m.
C. One radiation has wavelength =$$\lambda_1(900nm) $$ and energy= $$E_{1}$$. Other radiation has wavelength = $$\lambda_2(300nm) $$ and energy= $$E2 \cdot E1 : E_2= 3 : 1$$.
D. Number of photons of light of wavelength 2000 pm that provides 1 J of
energy is $$1.006 x 10^{16}$$.

Choose the correct answer from the options given below:

Given below are two statements:

Statement I: $$(CH_3)_3C^+$$ is more stable than $$CH_3^+$$ as nine hyperconjugation interactions are possible in $$(CH_3)_3C^+$$.
Statement II: $$CH_3^+$$ is less stable than $$(CH_3)_3C^+$$ as only three hyperconjugation interactions are possible in $$CH_3^+$$.

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

Consider the above electrochemical cell where a metal electrode (M) is undergoing redox reaction by forming $$M^{+}(M\rightarrow M^{+}+e^{-})$$. The cation $$M^{+}$$ is present in two different concentrations $$c_{1}$$ and $$c_{2}$$ as shown above. which of the following statement is correct for generating a positive cell potential?

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

In Carius method 0.2425 g of an organic compound gave 0.5253 g silver chloride.
The percentage of chlorine in the organic compound is

Which statements are NOT TRUE about $$XeO_2 F_2$$?

A. It has a see-saw shape.
B. Xe has 5 electron pairs in its valence sheU in XeO 2 F 2.
C. The $$O - Xe- O$$ bond angle is close to $$180^{o}$$.
D. The $$F- Xe -F$$ bond angle is close to $$180^{o}$$.
E. $$Xe$$ has 16 valence electrons in $$XeO_2 F_2$$.

Choose the correct answer from the options given below:

Observe the following reactions at T(K).

I. $$A\rightarrow$$products
II. $$5Br^{-}(aq)+BrO_{3}\text{ } ^{-}(aq)\rightarrow 3Br_2(aq)+3H_2O(l)$$

Both the reactions are started at 10.00 am. The rates of these reactions at 10.10 am are same. The value of $$-\frac{\triangle[Br^{-}]}{\triangle t}$$ at 10.10am. is $$2\times 10^{-4} mol \text{ }L^{-1}min^{-1}$$. The concentration of A at 10.10am is $$10^{-1}mol \text{ } L^{-1}$$. What is the first order rate constant (in min^{-1}) of reaction I?

Which of the following statements are TRUE about Haloform reaction?:

A. Sodium hypochlorite reacts with KI to give KOI.
B. KOI is a reducing agent.

C. $$ \alpha,\beta$$-unsaturated methylketone $$\mathrm{CH_3 - CH = CH - C(=O) - CH_3}$$ will give iodoform reaction.
D. Isopropyl alcohol will not give iodoform test.
E. Methanoic acid will give positive iodoform test.

Choose the correct answer from the options given below:

The oxidation state of chromium in the final product formed in the reaction between $$KI$$ and acidified $$K_2 Cr_2 O_7$$ solution is:

$$X_2(g ) + Y_2(g ) \rightleftharpoons 2Z(g)$$

$$X_2(g )$$ and $$Y_2(g )$$ are added to a 1 L flask and it is found that the system attains the above equilibrium at T(K) with the number of moles of $$X_2(g ),\text{ } Y_2(g )$$ and $$Z(g)$$ being 3, 3 and 9 mol respectively (equilibrium moles). Under this condition of equilibrium, 10 mol of $$Z(g$$) is added to the flask and the temperature is maintained at $$T(K)$$. Then the number of moles of $$Z(g)$$ in the flask when the new equilibrium is established is __ . (Nearest integer)

Consider the following reaction of benzene.

In compound (Q), the percentage of oxygen is ___ %. (Nearest integer)

200 cc of $$ x\times 10^{-3} M$$ potassium dichromate is required to oxidise 750 cc of 0.6 M Mohr's salt solution in acidic mediun.
Here $$x$$ =___________

Two liquids A and B form an ideal solution. At 320 K, the vapour pressure of the solution, containing 3 mol of A and 1 mol of B is 500 mm Hg. At the same
temperature, if 1 mol of A is farther added to this solution, vapour pressure of the solution increases by 20 mm Hg. Vapour pressure (in mm Hg) of B in pure state is ____ . (Nearest integer)

Total number of unpaired electrons present in the central met al atoms/ions of
$$[Ni(CO)_4],[NiCl_4]^{2-},[PtCl_2(NH_3)_2],[Ni(CN)_4]^{2-}$$ and $$[Pt(CN)_4]^{2-}$$ is_____