Which of the following oxide is most acidic

(1) Na2O

(2) Al2O3

(3) P2O5

(4) SO3

Subtopic:  Group 16 - Preparation, Properties & Uses |
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The least acidic oxide among the following is:

1. P4O6 

2. P4O10 

3. As4O6 

4. As4O10 

Subtopic:  Group 15 - Preparation, Properties & Uses |
 51%
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Which of the following polyhalide ion is most stable

1. Br3- 

2. I3- 

3. Cl3- 

4. F3- 

Subtopic:  Group 17 - Preparation, Properties & Uses |
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A diamagnetic element burns in air to form a dioxide.This dioxide can reduce iodine to HI. When H2 gas is bubbled through this element, it forms a hydride.It was found that the reaction of the dioxide and hydride of this element produces the same metal again.The element is

(1) S

(2) Si

(3) Te

(4) PO

Subtopic:  Group 16 - Preparation, Properties & Uses |
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Point out the incorrect statement among the following :

(1) The oxidation state of oxygen is +2 in OF2.

(2) Acidic character follows the order H2O < H2S < H2Se < H2Te.

(3) The tendency to form multiple bonds increases in moving down the group from sulphur to tellurium (towards C and N)

(4) Sulphur has a strong tendency to catenate while oxygen shows this tendency to a limited extent.

Subtopic:  Group 16 - Preparation, Properties & Uses |
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Which of the following statements is unacceptable?

(1) Among HClO3, HClO4,HClO and HClO2, HClO3 is the weakest acid.

(2)Bromide ion can be oxidised to Br2 by chlorine.

(3) Cl2O7 is the anhydride of HClO4.

(4) Among halide ions, F- has the highest hydration energy.

Subtopic:  Group 17 - Preparation, Properties & Uses |
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Moist ammonia gas is dried over

(1) P2O5

(2) Anhydrous CaCl2

(3)Quick lime

(4)Conc. H2SO4

Subtopic:  Group 15 - Preparation, Properties & Uses |
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The correct increasing order for the acid strength of nitrogen oxides is: 

1. N2NO N2ON2ON2O5

2. N2O NO N2ON2ON2O5

3. N2O N2ON2ON2ONO

4. NO N2O N2ON2ON2O5

Subtopic:  Group 15 - Preparation, Properties & Uses |
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In the compounds of the type POX3, the P atom multiple bond is of the type

(1) pπ-

(2) dπ-

(3) pπ-

(4) None of these

Subtopic:  Group 15 - Preparation, Properties & Uses |
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Which of the following statement is not true for phosphorus?

1. It is non-metal.
2. It exists as a tetrahedral molecular solid.
3. It is less reactive than nitrogen.
4. P-P bond is much weaker than  N≡N  bond.

Subtopic:  Group 15 - Preparation, Properties & Uses |
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