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The lanthanide contraction is responsible for the fact that__________.

(A) Zn and Y have about the same radii (B) Zr and Hf have about the same radii (C) Zr and Zb have a similar oxidation state (D) Zr and Zn... View Article

Iodoform test is not given by:

(A) CH3CHO (B) C2H5OH (C) Pentan-3-one (D) Pentan-2-one The Correct Answer is (C) Pentane-3-one Solution: Iodoform test is given by... View Article

In which of the following most efficient packing in present?

(A) hcp (B) bcc (C) Simple cubic (D) None Of These The Correct Answer is (A) hcp Solution: The packing efficiency of the lattices... View Article

Which of the following molecules is paramagnetic?

(A) O3 (B) N2 (C) CO (D) NO The Correct Answer is (D) NO Solution: Nitric oxide (NO) is paramagnetic among the given molecules. A... View Article

What is the percentage of nitrogen present in ammonium nitrate? (N=14, H=1, O=16)

(A) 25 % (B) 30 % (C) 35 % (D) 40 % The Correct Answer is (C) 35 %. Solution: The percentage of Nitrogen (N) present in Ammonium... View Article

The outer orbitals of C in ethene molecule can be considered to be hybridized to give three equivalent SP2 orbitals.The total number of sigma(σ) and Pi(π) bonds in ethene molecule is

(A) 1 sigma(σ) and 2 Pi(π) bonds (B) 2 sigma(σ) and 1 Pi(π) bonds (C) 3 sigma(σ) and 2 Pi(π) bonds (D) 4... View Article

The density of metal which crystallises in bcc lattice with unit cell edge length 300 pm and molar mass 50 g mol-1 will be

(A) 6.15 g cm-3 (B) 9.31 g cm-3 (C) 10.0 g cm-3 (D) 14.2 g cm-3 The Correct Answer is (A) 6.15 g cm-3 Unit Cell is the smallest part... View Article

Which of the following has the highest bond order?

(A) H2 (B) O2 (C) N2 (D) He2 The Correct Answer is (C) N2 Solution: Nitrogen (N2) has the highest bond order among H2, O2 and He2... View Article

P is an aqueous solution of acid and Q is an aqueous solution of base. When these two are diluted separately, then:

(A) The pH of P and Q increases (B) The pH of P and Q decreases (C) The pH of P increases, and the pH of Q decreases (D) The pH of P... View Article

If two liquids A and B form minimum boiling azeotrope at some specific composition then:

(A) A-B interactions are weaker than those between A-A or B-B. (B) A-B interactions are stronger than those between A-A or B-B. (C) The vapour... View Article

Calculate the percentage by mole of NO2 in a mixture of NO2(g) and NO(g) having average molecular mass equal to 34?

(A) 20 % (B) 25 % (C) 40 % (D) 75 % The Correct Answer is (B) 25 % Solution: Let x be the percentage by mole of NO2 in the mixture. The... View Article

Atoms of element B from HCP lattice and those of the element A occupy 2/3 rd of tetrahedral voids. What is the formula of the compound formed by the elements A and B?

(A) A1B1 (B) A2B1 (C) A3B2 (D) A4B3 The Correct Answer is (D) A4B3 Solution: As given in the question, Atoms of element B from HCP... View Article

The ease of formation of free radicals follows which of the following order?

(A) 1° > 2° > 3° > CH3 (B) 2° > 1° > 3° > CH3 (C) 3° > 2° > 1° > CH3 (D) CH3 > 3° > 2° > 1° The Correct... View Article

If the concentration of hydrogen ion in a sample of soft drink is 3.8 * 10–3 m.What will be its pH?

(A) 2.42 (B) 2.82 (C) 3.08 (D) None Of These The Correct Answer is (A) 2.42. Solution: As given in the question: The concentration of... View Article

Two plots are shown below between concentration and time t. Which of the given orders are shown by the graphs respectively?

(A) Zero-order and first-order reaction (B) Zero-order and second-order reaction (C) Second-order and zero-order reaction (D) First-order and... View Article

Which of the following statement is true for an oxidation reaction?

(A) Removal of oxygen (B) Addition of oxygen (C) Removal of hydrogen (D) Both (B) and (C) The Correct Answer is (D) Both (B) and (C)... View Article

What will be the ratio between the root mean square speed of H2 at 50 k and that of O2 at 800 k?

(A) 1 (B) 2 (C) 4 (D) 1/4 The Correct Answer is (A) 1 Solution: As we know, For H_{2} at 50 K For O_{2} at 800 K... View Article

The first ionisation potential of Na is 5.1 eV. The value of electron gain enthalpy of Na+ will be:

(A) -51eV (B) -5.1eV (C) -255eV (D) -2.55eV The Correct Answer is (B) -5.1eV Solution: Here IE = 5.1 eV Here the second reaction is... View Article

Which of the following statement explains why oxygen can be separated from nitrogen by the fractional distillation of liquid air?

(A) Oxygen is denser than nitrogen (B) Oxygen is more reactive than nitrogen (C) Both oxygen and nitrogen have different boiling points (D)... View Article

A compound XY crystallizes in BCC lattice with unit cell edge length of 480 pm. If the radius of Y− is 225 pm. What will be the radius of X+

(A) 225 pm (B) 255 pm (C) 127.5 pm (D) 190.68 pm The Correct Answer is (D) 190.68 pm Solution: As we know, the sum of the ionic... View Article