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:

The ratio of the wavelengths of the light absorbed by a Hydrogen atom when it undergoes n = 2 → n = 3 and n = 4 → n = 6 transitions, respectively, is

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

Predict the major product 'P' in the following sequence of reactions:

Which of the following are paramagnetic? A. [NiCl₄]²⁻ B. Ni(CO)₄ C. [Ni(CN)₄]²⁻ D. [Ni(H₂O)₆]²⁺ E. Ni(PPh₃)₄ Choose the correct answer from the options given below.

Given below are two statements : Statement I : Like nitrogen that can form ammonia, arsenic can form arsine. Statement II : Antimony cannot form antimony pentoxide. In the light of the above statements, choose the most appropriate answer from the options given below.

Which among the following electronic configurations belong to main group elements? A. [Ne]3s¹ B. [Ar]3d³4s² C. [Kr]4d¹⁰5s²5p⁵ D. [Ar]3d¹⁰4s¹ E. [Rn]5f⁰6d²7s² Choose the correct answer from the options given below.

Dalton’s Atomic theory could not explain which of the following?

Consider the following compounds: KO₂, H₂O₂ and H₂SO₄. The oxidation states of the underlined elements in them are, respectively,