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1.

The number of `P-O-P` bridge in the structure of phosphorous pentoxide and phosphorus trioxide are respectivelyA. 6,6B. 5,5C. 5,6D. 6,5

Answer» Correct Answer - A
Discussion
2.

Which of the following elements is kept in water?A. White PB. NaC. SD. Si

Answer» Correct Answer - A::C
Discussion
3.

For `H_(3)PO_(3)` and `H_(3)PO_(4)` the correct choice isA. `H_(3)PO_(3)` is dibasic and reducingB. `H_(3)PO_(4)` is dibasic and non-reducingC. `H_(3)PO_(4)` is tribasic and reducingD. `H_(3)PO_(3)` is tribasic and non-reducing

Answer» Correct Answer - A
Discussion
4.

Which of the following is arranged in the increasing order of enthalpy of vaporization?A. `NH_(3),PH_(3),AsH_(3)`B. `AsH_(3),PH_(3),NH_(3)`C. `NH_(3),AsH_(3),PH_(3)`D. `PH_(3),AsH_(3),NH_(3)`

Answer» Correct Answer - A::C
Discussion
5.

The P-P-P angle in `P_(4)` molecule is …………..degree while S-S-S angle in `S_(8)` is ………..degree.

Answer» Correct Answer - `60^(@),107^(@)`
Discussion
6.

Red phoshphorus is …………..reactive than white phosphorus is ………… and consists of…………..of `P_(4)` units.

Answer» Correct Answer - less, polymeirc, chains
Discussion
7.

The molecules of `PCl_(5)` in the solied state is ………..in nature consisting of tetrahedral…………cation and octahedral……………anion.

Answer» Correct Answer - ionic, `PCl_(4)^(+),PCl_(6)^(-)`
Discussion
8.

Laughing gas is obtained when a mixture of `NH_(4)Cl` and …………is heated while nitrogen gas is obtained when a mixture of `NH_(4)Cl` and ………….is heated.

Answer» Correct Answer - `NaNO_(3),NaNO_(2)`
Discussion
9.

The formula of acidic nitrogen hydride is ………….. .

Answer» Correct Answer - `N_(3)H`
Discussion
10.

Which of the following does not form a pentachloride?A. PB. AsC. SbD. N

Answer» Correct Answer - A::B::C::D
Discussion
11.

Which of the following on heating does not given nitrogen gas?A. `NH_(4)NO_(3)`B. `NH_(4)NO_(2)`C. `Ba(N_(3)_(2)`D. `(NH_(4))_(2)Cr_(2)O_(1)`

Answer» Correct Answer - A::B::C::D
Discussion
12.

`As_(2)O_(5)` is …………..while `Sb_(2)O_(5)` is ………….

Answer» Correct Answer - acidic, amphoteric
Discussion
13.

Conc. `HNO_(3)` on dehydration with `P_(4)O_(10)` gives…………

Answer» Correct Answer - `N_(2)O_(5)`
Discussion
14.

In a cyclotrimetaphosphoric acid molecule, how many single and double bonds are present ?A. 3 double bonds , 9 single bondsB. 6 double bonds , 6 single bondsC. 3 double bonds , 12 single bondsD. Zero double bonds , 12 single bonds

Answer» Correct Answer - A
Discussion