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Which of these elements of the 2nd period forms the strongest acidic oxide?

(A) Boron (B) Carbon (C) Nitrogen (D) Fluorine The Correct Answer is (D) Fluorine. Solution: Among the given elements of... View Article

Which of the following molecules has non – dipole moment?

(A) NH+4 (B) PCl5 (C) BrF3 (D) XeO3F2 The Correct Answer is (C) BrF3 Bromine trifluoride (BrF3) molecule has a non-dipole... View Article

The correct order of density of the following elements is:(Be, Mg, Ca, Sr)?

(A) Be > Mg > Ca > Sr (B) Ca > Mg > Be > Sr (C) Mg < Ca... View Article

Which of the following is the incorrect order of dipole moment?

(A) HF > HCl > HBr (B) NH3 > NCl3 > NF3 (C) NH3 > NF3 > NCl3 (D) CH3Cl... View Article

Which one of the following is the incorrect order of boiling points of the alkyl/aryl halides?

(A) CHCl3 > CH2Cl2 (B) (CH3)3CCL > (CH3)2CHCH2Cl (C) CH3 (CH2)3 Cl > CH3 (CH2)2 Cl (D) CH3 (CH2)3 Cl... View Article

Which of the following elements has the highest electron affinity?

(A) Oxygen (B) Chlorine (C) Nitrogen (D) Fluorine The Correct Answer is (B) Chlorine. Solution: Among the following elements, chlorine... View Article

Assertion: Sodium hydrogen-carbonate is an acidic salt. Reason: The pH of an aqueous solution of sodium hydrogen-carbonate is more than 7.0.

(A) Assertion is true and the reason is false. (B) Assertion is false and the reason is true. (C) Both... View Article

Mechanism of a hypothetical reaction X2 + Y2 → 2xy is given below.(i) X2 ⇌ X + X (fast)(ii) X + Y2 → XY + Y (slow)(iii) X + Y → XY (fast)What will be the overall order of the reaction?

(A) 0 (B) 1 (C) 2 (D) 1.5 The Correct Answer is (D) 1.5. Solution: Let the above-given reaction (i)... View Article

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:... 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... 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... 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) \(\begin{array}{l} \frac{y}{9}\end{array} \) (C) \(\begin{array}{l} -\frac{y}{9}\end{array} \) (D) \(\begin{array}{l} \frac{4y}{9}\end{array} \) The Correct Answer is (A) y... 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... 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... 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... 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.... 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:... View Article

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