A substance that gives a brick red flame and breaks down on heating to give oxygen and a brown gas is:

1. Calcium carbonate

2. Magnesium carbonate

3. Calcium nitrate

4. None of the above

Which of the following contains salts of H₃PO₃?

I. NaH₂PO₃    II. Na₂HPO₃    III. Na₃PO₃  

1. I, and II only

2. I, II, and III

3. II and III only

4. III only

Which of the following statements is false?

1. ONCl and ${\mathrm{ONO}}^{- }$are isoelectronic.

2. ${\mathrm{O}}_3$ molecule is bent

3. Ozone is violet-black in solid-state

4. Ozone is diamagnetic gas

Element/s that form pπ - pπ multiple bonds with themselves, as well as with carbon and oxygen are:

1. P, As

2. N, As

3. N, P

4. N

Among the following molecules, 

(i) $\stackrel{..}{X}e{O}_3$

(ii) $\stackrel{..}{X}eO{F}_4$

(iii) $\stackrel{..}{X}e{F}_6$

Those having the same number of lone pairs on Xe are

1. (i) and (ii) only

2. (i) and (iii) only

3. (ii) and (iii) only

4. (i), (ii) and (iii) only

Nitrogen gas is liberated by the thermal decomposition of:

1. ${\mathrm{NH}}_4{\mathrm{NO}}_2$                                 

2. ${\mathrm{NaN}}_3$

3. ${\left({\mathrm{NH}}_4\right)}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$                           

4. All of the above. 

Which of the following statements about the subsequent reactions is false?
\(XeF_6 + H_2O \text{(excess)} \longrightarrow\ 'X' + HF \)
\(XeF_6 + 2H_2O \longrightarrow\ 'Y' + HF \)

1. 'X' is explosive

2. 'Y' is an oxyacid of xenon

3. Both are example of non-redox reaction

4. ${\mathrm{XeF}}_6$ can undergo partial hydrolysis

Which of the following compound does not exist?

1. XeOF₄

2. NeF₂

3. XeF₂

4. XeF₆ 

Which of the following hydrides is the most acidic?

1. H₂Te

2. H₂Se

3. H₂O

4. H₂S

P forms multiple bonds in POCl₃ by using

1. $p\mathrm{\pi }-\mathrm{p\pi }$

2. $d\mathrm{\pi }-\mathrm{d\pi }$

3. $p\mathrm{\pi }-\mathrm{d\pi }$

4. None of the above.