Archives

2H2S + SO2 → 2H2O + 3S. In the following reaction, what is the magnitude of difference in the oxidation state of sulphur in H2S and in SO2?

(A) 0, +2 (B) -4, 0 (C) -2, +2 (D) +2, -4 The Correct Answer is (D) +2, -4. Solution: The oxidation state of S changes from -2 in H2S... View Article

When F2 reacts with H2S, Sulphur’s product (x) is formed.

(A) SF2 (B) SF4 (C) SF6 (D) OF2 The Correct Answer is (C) SF6 Solution: When Hydrogen Sulfide (H2S) reacts with Fluorine (F2), the compound... View Article

A greenish coating that develops on copper utensils is due to the formation of

(A) CuO (B) CuCO3 (C) Cu(OH)2 (D) Cu(OH)2.CuCO3 The Correct Answer is (D) Cu(OH)2.CuCO3. Solution: All copper vessels develop a green... View Article

An electron is moving in the 3rd orbit of Li2+ and its separation energy is y. The separation energy of an electron moving in the 2nd orbit of He+ is:

(A) y (B) (C) (D) The Correct Answer is (A) y Solution: As given: The separation energy of Li2+ is y Then Therefore, y = 13.6... View Article

Identify A and B in the following reaction.

Solution: In this reaction, Mg will exist as Mg2+, and it will attack chlorine since it has more electron density. This will be a... View Article

Generally, transition elements form coloured salts due to the presence of unpaired electrons. Which of the following compounds are expected to be coloured in solid-state?

(A) CuF2 (B) ZnF2 (C) Cu2Cl2 (D) Ag2SO4 The Correct Answer is (A) CuF2. Solution: Transition elements form coloured salts due to the... View Article

For the given compound X, the total number of optically active stereoisomers is

(A) 4 (B) 5 (C) 6 (D) 7 The Correct Answer is (D) 7 Solution: The total number of optically active stereoisomers is 7. Explore more such... View Article

The weights of two elements which combine with one another are in the ratio of their:

(A) Equivalent weight (B) Atomic weight (C) Molecular weight (D) All of these The Correct Answer is (B) Atomic weight. Solution: According... View Article

What is the maximum number of emission lines when the excited electron of a hydrogen atom in n = 6 drops to the ground state?

(A) 10 lines (B) 12 lines (C) 15 lines (D) 18 lines The Correct Answer is (C) 15 lines. Solution: The maximum number of emission lines when... View Article

Which of the following is not a state function?

(A) Work (B) Entropy (C) Enthalpy (D) Internal energy The Correct Answer is (A) Work Solution: Work is not a state function. A state... View Article

Where would you locate the element with electronic configuration 2, 8 in the Modern Periodic Table?

(A) Group 2 (B) Group 8 (C) Group 10 (D) Group 18 The Correct Answer is (D) Group 18. Solution: The Group 18 elements are called noble gas.... View Article

If the distance between Na+ and Cl- ions in NaCl crystals is ‘a’ pm. What is the length of the edge of the unit cell?

(A) 2X pm (B) 4X pm (C) X/2 pm (D) X/4 pm The Correct Answer is (A) 2X pm Solution: In the fcc unit cell of NaCl, along a given edge,... View Article

Which of the following is a non-stoichiometric defect?

(A) Frenkel defect (B) Schottky defect (C) Interstitial defect (D) Metal deficiency defect The Correct Answer is (D) Metal deficiency defect.... View Article

Let r be the relation on z defined by R = {( a , b ): a , b ∈ Z , a – b is an integer}. Find the domain and range of R.

Given, r is the relation on Z defined by:... View Article

Which of the following equations have a unique solution or infinitely many solutions. (i) x−3y−3=0;3x−9y−2=0 (ii) 2x+y=5;3x+2y=8

In the following equations we need to find which one have a unique solution or infinitely many solutions. (i) x−3y−3=0;... View Article

For a body in a circular motion with a constant angular velocity, the magnitude of the average acceleration over a period of half a revolution is…… times the magnitude of its instantaneous acceleration

a) 2/π b) π/2 c) π d) 2 Answer: a) 2/π Solution: Average acceleration, aavg = ΔV/ Δt =... View Article

M	T	W	T	F	S	S
					1	2
3	4	5	6	7	8	9
10	11	12	13	14	15	16
17	18	19	20	21	22	23
24	25	26	27	28	29	30
31