The correct order of atomic radii of the group 13 elements is-

1. B < Al < In < Ga < Tl
2. B < Al < Ga < In < Tl
3. B < Ga < Al < Tl < In
4. B < Ga < Al < In < Tl

The correct order of N-compounds in its decreasing order of oxidation states is :

1. ${\mathrm{HNO}}_3,$ $\mathrm{NO},$ ${\mathrm{N}}_2,$ ${\mathrm{NH}}_4\mathrm{Cl}$

2. ${\mathrm{HNO}}_3,\hspace{0.17em}\mathrm{NO},\hspace{0.17em}{\mathrm{NH}}_4\mathrm{Cl},\hspace{0.17em}{\mathrm{N}}_2$

3. ${\mathrm{HNO}}_3,\hspace{0.17em}{\mathrm{NH}}_4\mathrm{Cl},\hspace{0.17em}\mathrm{NO},\hspace{0.17em}{\mathrm{N}}_2$

4. ${\mathrm{NH}}_4\mathrm{Cl},\hspace{0.17em}{\mathrm{N}}_2,\hspace{0.17em}\mathrm{NO},\hspace{0.17em}{\mathrm{HNO}}_3$

The following solutions were prepared by mixing different volumes of NaOH and HCl of different concentrations:

A)  $60$ $mL$ $\frac{M}{10}HCl$ $$ $+$ $40$ $mL$ $\frac{M}{10}NaOH$

B)   $55$ $mL$ $\frac{M}{10}HCl$ $$ $+$ $45$ $mL$ $\frac{M}{10}NaOH$

C)  $75$ $mL$ $\frac{M}{5}HCl$ $$ $+$ $25$ $mL$ $\frac{M}{5}NaOH$

D)  $100$ $mL$ $\frac{M}{10}HCl$ $$ $+$ $100$ $mL$ $\frac{M}{10}NaOH$

Which of them will have a pH equal to 1?

1. B
2. A
3. D
4. C

The solubility of BaSO₄ in water is $2.42$ $\times$ ${10}^{-3}$ g/ litre at 298 K. The value of the solubility product will be: (Molar mass of BaSO₄ = 233 gmol^–1)

If van der Waals constant "a" for NH₃, H₂ and CO₂ are respectively 4.17, 0.244, 1.36 and 3.59, then which one of the following gases is most easily liquefied?

$1.$ ${\mathrm{NH}}_3$
$2.$ ${\mathrm{H}}_2$
$3.$ ${\mathrm{O}}_2$
$4.$ ${\mathrm{CO}}_2$

The compound A on treatment with Na gives B, and with PCl₅ gives C. B and C react together to give diethyl ether.

A, B and C are, respectively:

1. ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH},$ ${\mathrm{C}}_2{\mathrm{H}}_6,$ ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Cl}$

2. ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH},$ ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Cl},$ ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{ONa}$

3. ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Cl},$ ${\mathrm{C}}_2{\mathrm{H}}_6,$ ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}$

4. ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH},$ ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{ONa}$ $,{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{Cl}$

Hydrocarbon (A) reacts with bromine by substitution reaction to form an alkyl bromide B.
B undergoes the Wurtz reaction to give a gaseous hydrocarbon containing less than four carbon atoms.

The formula of (A) is:

The compound ${\mathrm{C}}_7{\mathrm{H}}_8$ undergoes the following reactions :

${\mathrm{C}}_7{\mathrm{H}}_8\stackrel{3{\mathrm{Cl}}_2/\mathrm{hv}}{\to }\mathrm{A}\stackrel{{\mathrm{Br}}_2/\mathrm{Fe}}{\to }\mathrm{B}\stackrel{\mathrm{Zn}/\mathrm{HCl}}{\to }$ C

The product 'C' is :

1. m–Bromotoluene

2. o–Bromotoluene

3. 3–Bromo–2,4,6–trichlorotoluene

4. p–Bromotoluene

Which oxide of nitrogen is not a common pollutant introduced into the atmosphere both due to natural and human activity?

1. N₂O₅
2. NO₂
3. N₂O
4. NO