Chemistry Previous
Year Questions

Select the reagents that reduce nitriles to primary amines.

Match List-I with List-II: Choose the correct answer from the options given below.

Consider the following reaction: 2A(g) + B(g) → 2D(g) ΔU° = −10 kJ mol⁻¹ and ΔS° = −44 J K⁻¹ at 298 K Identify the correct option with ΔG° for the reaction and spontaneity of the reaction at 298 K. (Given: R = 8.31 J mol⁻¹ K⁻¹)

Match List I with List II: Choose the correct answer from the options given below.

In a qualitative analysis, Bi³⁺ is detected by appearance of precipitate of BiO(OH)(s). Calculate pH when the following equilibrium is established at 298 K: BiO(OH)(s) ⇌ BiO⁺(aq) + OH⁻(aq), K = 4 × 10⁻¹⁰ (Given: log2 = 0.3010)

The pair of molecules that are metamers among the following is:

Match List I with List II: Choose the correct answer from the options given below :

Match List I with List II: Choose the correct answer from the options given below :

The correct IUPAC name of the following compound is:

Methane reacts with steam at 1273 K in the presence of nickel catalyst to form:

Compound P(C₈H₈O) gives a red-orange precipitate with 2,4-DNP reagent and does not reduce Fehling's reagent. On drastic oxidation with chromic acid, P gives an aromatic acidic product Q that produces effervescence on treatment with aq. NaHCO₃. Compound P and Q respectively are:

Match List I with List II: Choose the correct answer from the options given below:

The following two reactions give the same foul smelling product Z. X and Z, respectively, are:

The number of hydrogen atoms present in 5.4 g of urea is: (Given: Molar mass of urea = 60 g mol⁻¹; Nₐ = 6.022 × 10²³ particles mol⁻¹)

Identify the incorrect statement from the following:

Which one of the following is an ambidentate ligand?

The correct order of increasing metallic character of Na, Be, P, Mg and Si is:

Match List I with List II: Choose the correct answer from the options given below:

Although +3 oxidation state is most common in lanthanoids, cerium still shows +4 oxidation state because:

In the following reaction sequence, X and Z respectively are:

Match List I with List II: Choose the correct answer from the options given below :

The functional group that can be identified through phthalein dye test is:

Two products X and Y are formed in the following reaction sequence. The suitable method that can be used for separation of products X and Y is:

Identify the correct statements: (A) The molality of 2.5 g of ethanoic acid (Molar mass: 60 g mol⁻¹) in 75 g of benzene solution is 0.556 m. (B) The molarity of a solution containing 5 g of NaOH (molar mass: 40 g mol⁻¹) in 450 mL of solution is 0.278 M at 298 K. (C) Aquatic species are more comfortable in cold water. (D) The solubility of gas increases with decrease in pressure. (E) For a binary mixture of A and B, the number of moles of A and B are nₐ and nᵦ respectively. The mole fraction of B will be: Xᵦ = nₐ / (nₐ + nᵦ) Choose the correct answer from the options given below :

During Lassaigne’s test, the elements present in an organic compound are converted from:

A solution of copper sulphate is electrolysed for 10 minutes with a current of 1.5 amperes. The mass of copper deposited at cathode is: (Given: Molar mass of Cu = 63 g mol⁻¹, 1F = 96487 C mol⁻¹)

For a certain reaction R → Product, the plot of concentration [R] versus time has a negative slope as shown. The order of reaction is:

Identify the correct statement about ClF₃ from the following options:

In a test tube containing a salt, a few drops of dilute H₂SO₄ was added, which gave colourless vapours having the smell of vinegar. The vapours turned blue litmus paper red. Identify the correct anion:

At 298 K, a certain buffer solution contains equal concentrations of X⁻ and HX. K$_b$ for X⁻ is 10⁻¹⁰. What is the pH of this buffer solution?

Calculate emf of the half cell:

The calculated spin-only magnetic moment of Ti²⁺ (3d²) is:

Identify the incorrect statement from the following:

The correct formal charges on oxygen atoms numbered 2, 1 and 3 respectively are:

Phenolphthalein is used as an indicator for the titration of sodium hydroxide solution against a standard solution of oxalic acid. The colour change observed at alkaline pH close to the equivalence point is:

When 1 dm³ of CO₂ gas is passed over hot coke, the volume of gaseous mixture after complete reaction at STP becomes 1.4 dm³. The composition of the gaseous mixture at STP is:

The major product Z formed in the following sequence of reactions is:

Given the expression for the rate constant of a first-order reaction at temperature T(K): ln k = 14.34 − (1.25 × 10⁴)/T. The energy of activation in kcal mol⁻¹ is: (Given: k in s⁻¹, R = 1.987 cal mol⁻¹ K⁻¹)

Given below are certain reactions. Identify the reaction for which Kp ≠ Kc.

Identify the incorrect statement from the following:

Mixture of chloroform and acetone forms a solution with negative deviation from Raoult’s law due to:

The number of chlorine atoms present in the organic products X and Y of the following reactions, respectively, are:

For the following reaction sequence, choose the correct option. $\text{Benzene} \xrightarrow[\text{ii. NaOCl}]{\text{i. }\mathrm{CH_3COCl,\ AlCl_3}} \mathrm{P + Q}$

Given below are two statements: Statement-I : $\mathrm{[Fe(ox)_3]^{3-}}$ is chiral. Statement-II : trans – $\mathrm{[Cr(H_2O)_2(ox)_2]^{-}}$ is chiral. (Given : $\mathrm{oxH_2 = HOOC-COOH}$) In light of the above statements, choose the most appropriate answer from the options given below:

The following carbocation is stabilized by the interaction of the empty $p$ orbital with $\mathrm{C_6H_5\overset{+}{C}H{-}CH_3}$

In potash alum, the ratio of $\mathrm{K^+}$ and $\mathrm{SO_4^{2-}}$ ions is

The correct statement about peptides and proteins is

The numbers $17.0145$ and $21.0235$ were rounded to three figures after the decimal point. The resulting numbers, respectively, are

The correct order of solubility of the given salts in water at 298 K is Salt | $K_{sp}$ at 298 K $\mathrm{AgBr}$ | $5.0 \times 10^{-13}$ $\mathrm{Zn(OH)_2}$ | $1.0 \times 10^{-15}$ $\mathrm{Hg_2Cl_2}$ | $1.3 \times 10^{-18}$

Among the following options, the correct trend in the electron gain enthalpy is