Which of the following oxyacids of chlorine is least tendency to get oxidise?

(1) HOCl

(2) HClO2

(3) HClO3

(4) HClO4

Subtopic:  Group 17 - Preparation, Properties & Uses |
 61%
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Which of the following is most basic

(1) F-

(2) Cl-

(3) Br-

(4) I-

Subtopic:  Group 17 - Preparation, Properties & Uses |
 65%
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Of the hydrides, H2OH2Seand H2Te, the one which has the smallest pKa value is

1. H2O

2. H2S

3. H2Se

4. H2Te

Subtopic:  Group 16 - Preparation, Properties & Uses |
 75%
From NCERT
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The shape of ClO3- is

(1) Tetrahedral

(2) Triangular planer

(3) Triangular pyramid

(4) Planer

Subtopic:  Group 17 - Preparation, Properties & Uses |
 61%
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Which reaction can not be used for the preparation of halogen acid

(A) 2KBr +H2SO4(conc.) K2SO4 +2HBr
(B) NaCl +H2SO4(conc.) NaHSO4 +HCl
(C) NaHSO4 +NaCl Na2SO4 +HCl
(D) CaF2 +H2SO4(conc.) CaSO4 +2HF

Subtopic:  Group 17 - Preparation, Properties & Uses |
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An element (X) forms compounds of the formula XCl3, X2O5 and Ca3X2,but does not form XCl5. Which of the following is the element

(1) B

(2) Al

(3) N

(4) P

Subtopic:  Group 15 - Preparation, Properties & Uses |
 73%
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Oxygen does not form OF6 because

1. It has a small size

2. There are no vacant d- orbitals available

3.  It has high ionization energy

4. It has a large size

Subtopic:  Group 16 - Preparation, Properties & Uses |
 89%
From NCERT
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The molecule having the smallest bond angle is

(1) H2O

(2) H2S

(3) H2Te

(4) H2Se

Subtopic:  Group 16 - Preparation, Properties & Uses |
 62%
From NCERT
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The correct statement regarding H3PO3 is:

1. Each hydrogen atom is attached to oxygen.

2. Two hydrogen atoms are attached to oxygen atoms.

3. One atom of H is attached to oxygen.

4. None of the above.

Subtopic:  Group 16 - Preparation, Properties & Uses |
 80%
From NCERT
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Strong oxidising agent and strong reducing agents are respectively

(1) F2, HI

(2) Cl2, HCl

(3) Br2,HBr

(4) I2, HF

Subtopic:  Group 17 - Preparation, Properties & Uses |
 87%
From NCERT
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