The element that does not form pentoxide is:

1. As
2. Sb
3. Bi
4. P

Subtopic:  Group 15 - Preparation, Properties & Uses |
 70%
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F2 reacts with dilute NaOH to give oxygen difluroide of the formula

(1) F2O

(2) OF2

(3) F2O2

(4) F2O3

Subtopic:  Group 17 - Preparation, Properties & Uses |
 86%
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Which of the following oxyacids of chlorine is having least tendency to get oxidized?

(1) HOCl

(2) HClO2

(3) HClO3

(4) HClO4

Subtopic:  Group 17 - Preparation, Properties & Uses |
 56%
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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 |
 66%
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The compound among the following with the lowest pKa value is?

1. H2O

2. H2S

3. H2Se

4. H2Te

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

(A) Tetrahedral

(B) Triangular planer

(C) Triangular pyramid

(D) Planer

Subtopic:  Group 17 - Preparation, Properties & Uses |
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Oxygen does not form OF6 because

(A) It has a small size

(B) There are no vacant d- orbitals available

(C) It has high ionisation energy

(D) It has large size

Subtopic:  Group 16 - Preparation, Properties & Uses |
 91%
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The molecule having the smallest bond angle among the following is -

(1) H2O

(2) H2S

(3) H2Te

(4) H2Se

Subtopic:  Group 16 - Preparation, Properties & Uses |
 64%
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The oxide of a non-metal possesses the following characteristics:

i. It is both a proton donor and a proton acceptor.
ii. It is a poor conductor of electricity.
iii. It reacts readily with basic and acidic oxides.
iv. It oxidises Fe at boiling point.

The formula for oxide is:

1. H2O

2. CO2

3. H2O2

4. NO

Subtopic:  Group 16 - Preparation, Properties & Uses |
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A yellow metallic powder is burnt in a stream of fluorine to obtain a colourless gas X which is thermally stable and chemically inert. Its molecule has octahedral geometry. Another colourless gas Y with same constituent atoms as that of X is obtained when sulphur dichloride is heated with sodium fluoride. Its molecule has triangular pyramidal structure X and Y are

(A) SF4 and S2F2

(B)  SF6 and  SF4 

(C) NaF and NaCl

(D)  SF4 and SF6 

Subtopic:  Group 16 - Preparation, Properties & Uses |
 78%
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