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1. (X) = Phosphorous acid , (Y) = Metaphosphoric acid
2. (X) = Pyrophosphoric acid , (Y) = Metaphosphoric acid
3. (X) = Metaphosphoric acid , (Y) = Pyrophosphoric acid
4. (X) = Metaphosphoric acid , (Y) = Phosphene gas

Boron forms ${\mathrm{BX}}_3$ type of halides. The correct increasing order of Lewis-acid strength of these halides is
1. ${\mathrm{BF}}_3$ > ${\mathrm{BCl}}_3$ > ${\mathrm{BBr}}_3$ > ${\mathrm{Bl}}_3$
2. ${\mathrm{Bl}}_3$ > ${\mathrm{BBr}}_3$ > ${\mathrm{BCl}}_3$ > ${\mathrm{BF}}_3$
3. ${\mathrm{BF}}_3$ > ${\mathrm{Bl}}_3$ > ${\mathrm{BCl}}_3$ > ${\mathrm{BBr}}_3$
4. ${\mathrm{BF}}_3$> ${\mathrm{BCl}}_3$ > ${\mathrm{Bl}}_3$ > ${\mathrm{BBr}}_3$

Which one of the following compounds on strong heating evolves ammonia gas?
1. ${(\mathrm{NH}}_{}$₄)2SO4
2. ${\mathrm{HNO}}_3$
3. ${(\mathrm{NH}}_{}$₄)2Cr2O7
4. ${\mathrm{NH}}_3{\mathrm{NO}}_3$

The compound ${(\mathrm{SiH}}_{}$₃)3 N is
1. Pyramidal and more basic than ${(\mathrm{CH}}_{}$₃)3N
2. Planar and less basic than ${(\mathrm{CH}}_{}$₃)3N
3. Pyramidal and less basic than ${(\mathrm{CH}}_{}$₃)3N
4. Planar and more basic than ${(\mathrm{CH}}_{}$₃)3N

$\mathrm{RCl}$ $\underset{\mathrm{Si}}{\overset{\mathrm{cu}-\mathrm{powder}}{\to }}{\mathrm{R}}_2{\mathrm{SiCl}}_2\stackrel{{\mathrm{H}}_2\mathrm{O}}{\to }$
${\mathrm{R}}_2\mathrm{Si}{\left(\mathrm{OH}\right)}_2$ $\stackrel{\mathrm{condensation}}{\to }$ $\mathrm{A}$
Compound (A) is -

Match List - I with List - II

1. l-a, 11-b, III-d, IV-c
2. l-b, II-c, III-a, IV-d
3. l-a, II-d, III-C, IV-b
4. l-a, II-c, III-b, IV-d

Ammonia can be dried by
1. Conc.${\mathrm{H}}_2{\mathrm{SO}}_4$
2. ${\mathrm{P}}_4{\mathrm{O}}_{10}$
3. CaO
4. anhydrous ${\mathrm{CaCI}}_2$

Which one of the following statements is not true regarding diborane?
1. It has two bridging hydrogens and four perpendiculars to the rest.
2. When methylated, the product is ${\mathrm{Me}}_4{\mathrm{B}}_2{\mathrm{H}}_2.$
3. The bridging hydrogens are in a plane perpendicular to the rest.
4. All the B-H bond distances are equal.

There is no S−S bond in
 $\left(1\right) S_2{O}_4^{2-}$
$\left(2\right) S_2{O}_5^{2-}$
$\left(3\right) {\mathrm{S}}_2{\mathrm{O}}_6^{2-}$
$\mathit{\left(}\mathit{4}\mathit{\right)}\mathit{ }{S}_2{O}_7^{2-}$
 

Borax is actually made of two tetrahedral and two triangular units joined together and should be written as: ${\mathrm{Na}}_2\left[{\mathrm{B}}_4{\mathrm{O}}_5{\left(\mathrm{OH}\right)}_4\right]·8{\mathrm{H}}_2\mathrm{O}$
Consider the following statements about borax:
(a) Each boron atom has four B-O bonds
(b) Each boron atom has three B-O bonds
(c) Two boron atoms have four B-0 bonds while the other two have three B-O bonds
(d) Each boron atom has one -OH groups
Select the correct statement(s);
1. a, b
2. b,c
3. c, d
4. a, c

The reaction of ${\mathrm{P}}_4$ with X leads
Selectively to ${\mathrm{P}}_4{\mathrm{O}}_6$. The X is
1. Dry ${\mathrm{O}}_2$
2. A mixture of ${\mathrm{O}}_2$ and ${\mathrm{N}}_2$
3. Moist ${\mathrm{O}}_2$
4. ${\mathrm{O}}_2$  in the presence of a aqueous NaO

Identify the correct order of solubility of ${\mathrm{Na}}_2\mathrm{S}$, CuS, and ZnS in aqueous medium
1. CuS > ZnS > ${\mathrm{Na}}_2\mathrm{S}$
2. ZnS > ${\mathrm{Na}}_2\mathrm{S}$ > CuS
3. ${\mathrm{Na}}_2\mathrm{S}$ > CuS > ZnS
4. ${\mathrm{Na}}_2\mathrm{S}$ > ZnS > CuS

${\mathrm{H}}_3{\mathrm{BO}}_3$ is -
1. Monobasic acid and weak Lewis acid
2. Monobasic and weak Bronsted acid
3. Monobasic and strong Lewis acid
4. Tribasic and weak Bronsted acid

When ${\mathrm{I}}^{-}$ is oxidised by ${\mathrm{MnO}}_4^{-}$ in alkaline medium, ${\mathrm{I}}^{-}$ converts into ${}^{-}$
1. ${\mathrm{IO}}_3^{-}$
2. ${\mathrm{l}}_2$
3. ${\mathrm{IO}}_4^{-}$
4. ${\mathrm{lO}}^{-}$

$\mathrm{B}{\left(\mathrm{OH}\right)}_3+\mathrm{NaOH}\rightleftharpoons {\mathrm{NaBO}}_2+\mathrm{Na}\left[\mathrm{B}{\left(\mathrm{OH}\right)}_4\right]+{\mathrm{H}}_2\mathrm{O}$
 This reaction is made to proceed in forward direction by -
1. Addition of Cis- 1,2 diol
2. Addition of borax
3. Addition of trans 1,2- diol
4. Addition of ${\mathrm{Na}}_2{\mathrm{HPO}}_4$

A mixture of boric acid with ethyl alcohol burns with green edged flame due to the formation of -
1. Ethyl borax
2. Ethyl borate
3. Methyl borax
4. Methyl borate
 
 

Which of the following leaves no residue on heating?
1. Pb(NO₃)₂
2. ${\mathrm{NH}}_4{\mathrm{NO}}_3$
3. Cu(NO₃)₂
4. ${\mathrm{NaNO}}_3$

Which amongst the following reactions
cannot be used for the preparation of the halogen acid?
$\left(1\right) 2KBr+H2SO4(Conc.)\to {\mathrm{K}}_2{\mathrm{SO}}_4+)\to K2SO4+2\mathrm{HB}r$
$\left(2\right) 2\mathrm{NaCl}+{\mathrm{H}}_2{\mathrm{SO}}_{4}2NaCl+H2SO4(Conc.)\to \to {\mathrm{NaHSO}}_4+\mathrm{HCl}$
$\left(3\right) NaHSO4+HCl{\mathrm{NaHSO}}_4+\mathrm{NaCl}\to {\mathrm{Na}}_2{\mathrm{SO}}_4+\mathrm{HCl}930 NaHSO4+NaCl\to Na2SO4+HCl$$\left(4\right) {\mathrm{CaF}}_2+{\mathrm{H}}_2{\mathrm{SO}}_4(CaF2+H2SO4(conc.)\to {\mathrm{CaSO}}_4+)\to CaSO4+2\mathrm{HF}2HF$
 

An Aqueous solution of borax reacts with 2 moles of acid due to -
1. Formation of 2 moles of  B(OH)₃  only
2. Formation of 2 moles of  [B(OH)₄]^-  only
3. Formation of 1 mole each of  B(OH)₃ and [B(OH)₄]^-
4. Formation of 2 moles each of [B(OH)₄]^- and B(OH)₃, only [B(OH)₄]^-  reacts with an acid 

The species present in solution when ${\mathrm{CO}}_2$ is dissolved in water are -
1. ${\mathrm{CO}}_2, {\mathrm{H}}_2{\mathrm{CO}}_3, {\mathrm{HCO}}_3^{-}, {\mathrm{CO}}_3^{2-}$
2. ${\mathrm{H}}_2{\mathrm{CO}}_3, {\mathrm{CO}}_3^{2-}$
3. ${\mathrm{CO}}_3^{2-}, {\mathrm{HCO}}_3^{-}$
4. ${\mathrm{CO}}_2, {\mathrm{H}}_2{\mathrm{CO}}_3$

Which of the following is most easily hydrolysed amongst the following
1. ${\mathrm{SF}}_6$
2. ${\mathrm{NF}}_3$
3. ${\mathrm{CCI}}_4$
4. ${\mathrm{TeF}}_6$

Which of the following pair has bleaching property?
1. ${\mathrm{O}}_3 \mathrm{and} {\mathrm{NO}}_2$
2. ${\mathrm{O}}_2 \mathrm{and} {\mathrm{H}}_2\mathrm{S}$
3. ${\mathrm{SO}}_2 \mathrm{and} {\mathrm{CI}}_2$
4. ${\mathrm{CI}}_2 \mathrm{and} {\mathrm{NO}}_2$

Nitrogen is liberated by the thermal decomposition of only
1. ${\mathrm{NH}}_4{\mathrm{NO}}_2$
2. ${\mathrm{NaN}}_3$
3. ${(\mathrm{NH}}_{}$₄)2Cr2O7
4. All the three

Which of the following oxides of nitrogen is paramagnetic
1. ${\mathrm{N}}_2{\mathrm{O}}_3$
2. ${\mathrm{N}}_2\mathrm{O}$
3. ${\mathrm{NO}}_2$
4. ${\mathrm{N}}_2{\mathrm{O}}_5$

In which of the following arrangement, the order is not according to the property indicated against it