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By heating which of the following, would NO₂ be produced?
1. NaNO₃
2. AgNO₃
3. NH₄NO₃
4. NH₄NO₂

The formation of ${\mathrm{PH}}_4^{+}$ is difficult as compared to ${\mathrm{NH}}_4^{+}$ because
1. Lone pair of phosphorous is optically inert.
2. Lone pair of phosphorous resides in almost pure p - orbital.
3. Lone pair of phosphorous resides at sp³ orbital.
4. Lone pair of phosphorous resides in almost pure s - orbital.

Iodine on reaction with concentrated nitric acid forms:
1. HOI
2. HI
3. HIO₃
4. HIO₄

Incorrectly matched characteristic is:
1. S₈: covalent lattice
2. P₄: tetrahedron
3. S₅^2-: zigzag
4. SiO₂: Covalent lattice

 An oxyacid among the following that contains both P-H and P-P bonds simultaneously is:
1. H₄P₂O₅
2. H₄P₂O₇
3. H₄P₂O₆
4. None of the above

Which set of oxide of nitrogen is paramagnetic in nature?
(1) NO, N₂O
(2) NO₂, NO, N₂O
(3) NO,NO₂
(4) N₂O,NO₂

Compound among the following with an S-S bond is :
1. H₂S₂O₇
2. H₂SO₅
3. H₂S₂O₈
4. H₂S₂O₆

What is the correct order of oxyacids of phosphorous in terms of their acidic strength?
1. H₃PO₂ > H₃PO₃ > H₃PO₄
2. H₃PO₄ > H₃PO₃ > H₃PO₂
3. H₃PO₃ > H₃PO₂ > H₃PO₄
4. H₃PO₂ > H₃PO₄ > H₃PO₃

Which is not hydrolysed with water?
(1) PCl₃
(2) NF₃
(3) NCl₃
(4) BCl₃

Which of the statements given below is incorrect?
1. Cl₂O₇ is an anhydride of perchloric acid
2. O₃ molecule is bent
3. ONF is isoelectronic with Anionic NO2
4. OF₂ is an oxide of fluorine

For which element would $X{H}_3$ be a stable species :
(1) C                                 
(2) Si
(3) P                                 
(4) S

Which of the following compound does not produce oxyacid of central atom on hydrolysis?
(1) ${\mathrm{BF}}_3$                           
(2) ${\mathrm{NCl}}_3$
(3) ${\mathrm{SF}}_4$                           
(4) ${\mathrm{PCl}}_5$

One gas bleaches the colour of flowers by reduction, while the other gas bleaches by oxidation. The two gases, respectively, are:
1. $\mathrm{CO}$ $\mathrm{and}$ ${\mathrm{Cl}}_2$                             
2. ${\mathrm{H}}_2\mathrm{S}$ $\mathrm{and}$ ${\mathrm{Br}}_2$
3. ${\mathrm{NH}}_3$ $\mathrm{and}$ ${\mathrm{SO}}_3$                           
4. ${\mathrm{SO}}_2$ $\mathrm{and}$ ${\mathrm{Cl}}_2$

Cl₂(g) + Ba(OH)₂ → X(aq) + BaCl₂ + H₂O                      
X + H₂SO₄ → Y + BaSO₄                                              
Y \(\xrightarrow[]{\Delta \ > \ 365 \ K}\) Z + H₂O + O₂
Y and Z are respectively :
1. HClO₄, ClO₂
2. HClO₃, ClO₂
3. HClO₃, ClO₆
4. HClO₄, Cl₂O₇

Which of the following statements about helium is false?
1. It has the lowest boiling point 
2. It has the highest first ionization energy
3. It can diffuse through rubber and plastic material
4. It can form clathrate compounds

Incorrect statement regarding following reactions is :

(a) 'X' is explosive
(b) 'Y' is an oxyacid of xenon
(c) Both are example of non-redox reaction
(d) ${\mathrm{XeF}}_6$ can undergo partial hydrolysis

What is produced when orthophosphoric acid reacts with phosphate rock (fluorapatite)?
1. $\mathrm{Ca}{\left({\mathrm{H}}_2{\mathrm{PO}}_4\right)}_2+{\mathrm{CaF}}_2$                   
2. ${\mathrm{Ca}}_3{\left({\mathrm{PO}}_4\right)}_2+{\mathrm{CaF}}_2+{\mathrm{H}}_2\mathrm{O}$
3. $\mathrm{Ca}{\left({\mathrm{H}}_2{\mathrm{PO}}_4\right)}_2+\mathrm{HF}$                       
4. ${\mathrm{Ca}}_3{\left({\mathrm{PO}}_4\right)}_2+\mathrm{HF}+{\mathrm{H}}_2\mathrm{O}$

The ionic character of H-X is highest in
(1) HBr
(2) HI
(3) HF
(4)HCl

Which reaction can not be used for the preparation of halogen acid
$\left(A\right) 2KBr +H_{2}S{O}_4(conc.) \to K_{2}S{O}_4 +2HBr$
$\left(B\right) NaCl +H_{2}S{O}_4(conc.) \to NaHS{O}_4 +HCl$
$\left(C\right) NaHS{O}_4 +NaCl \to N{a}_{2}S{O}_4 +HCl$
$\left(D\right) Ca{F}_2 +H_{2}S{O}_4(conc.) \to CaS{O}_4 +2HF$

What order does the stability of interhalogen compounds follow?
1. IF₃  > BrF₃  > CIF₃
2. BrF₃ > IF₃ > ClF₃
3. ClF₃ > BrF₃ > IF₃
4. ClF₃ > IF₃ > BrF₃