11.

Which of the following is not tetrahedral ?

• ${\mathrm{BF}}_4^{-}$

• ${\mathrm{NH}}_4^{+}$

• ${\mathrm{CO}}_3^{2-}$

• ${\mathrm{SO}}_4^{2-}$

A certain mass of a gas occupies a volume of 2L at STP. To what temperature the gas must be heated to double its volume, keeping the pressure constant ?

• 100 K

• 273 K

• 273°C

• 546°C

The equilibrium constant for the reaction 

${\mathrm{SO}}_2\left(\mathrm{g}\right)\hspace{0.17em}+ \frac{1}{2}{\mathrm{O}}_2\left(\mathrm{g}\right) \rightleftharpoons {\mathrm{SO}}_3\left(\mathrm{g}\right) \mathrm{is}\hspace{0.17em}5\times {10}^{-2} \mathrm{atm}.$ The equilibnum constant of the reaction $2{\mathrm{SO}}_3\left(\mathrm{g}\right)\hspace{0.17em}\rightleftharpoons 2{\mathrm{SO}}_2\left(\mathrm{g}\right) + {\mathrm{O}}_2\left(\mathrm{g}\right) \mathrm{would}\hspace{0.17em}\mathrm{be}.$

• 100 atm

• 200 atm

• 4 × 10² atm

• 6.25 × 10⁴ atm

Assertion (A) : NaCl is less soluble in heavy water than in ordinary water.

Reason (R) : Dielectric constant of ordinary water is more than that of heavy water.

The correct answer is:

• Both (A) and (R) are true and (R) is the correct explanation of (A)

• Both (A) and (R) are true but (R) is not the correct explanation of (A)

• (A) is true, but (R) is not true

• (A) is not true, but (R) is true

Bhopal gas tragedy of 1984 was caused by

• carbon monoxide

• phosgene

• methyl cyanate

• methyl isocyanate

Identify 'B in the following reaction ${\mathrm{CH}}_2={\mathrm{CH}}_2 + \mathrm{HCl} \stackrel{\mathrm{anhy} {\mathrm{AlCl}}_3}{\to } \mathrm{A} + 2\left[\mathrm{H}\right] \underset{{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{OH}}{\overset{\mathrm{Zn}-\mathrm{Cu}}{\to }} \mathrm{B} + \mathrm{HCl}$

• CH₄

• C₂H₆

• C₂H₅Cl

• C₂H₅OH

The chemical formula of feldspar is

• KAlSi₃O₈

• Na₃AlF₆

• NaAlO₂

• K₂SO₄.Al₂(SO₄)₃4Al(OH)₄

An oxide of an element is a gas and dissolves in water to give an acidic solution. The element belongs to

• II group

• IV group

• VIII group

• Zero group

CaOCl₂ + H₂O → Ca(OH)₂ + X

X + CH₃CHO →  Y

Y + Ca(OH)₂  → CHCl₃

 What is 'Y'?

• CH₃CH(OH)₂

• CH₂Cl₂

• CCl₃CHO

• CCl₃COCH₃

Calorific value of producer gas is low because of

• high percent of N₂

• low percent of CO₂

• high percent of CO

• low percent of N₂