11.

Which of the following gives correct arrangement of compounds involved based on their bond strength ?

• HF > HCl > HBr > HI

• HI > HBr > HCl > HF

• HF > HBr > HCl > HI

• HCl > HF > HBr > HI

The enthalpy of combustion at 25°C of H₂, cyclohexane (C₆H₁₂) and cyclohexene (C₆H₁₀) are -241, -3920 and -3800 kJ/mol respectively. The heat of hydrogenation of cyclohexene is :

• -121 kJ/mol

• +121 kJ/mol

• -242 kJ/mol

• +242 kJ/mol

The entropy values (in JK^-1mol^-1) of H₂ (g) = 130.6, Cl₂ (g) = 223.0 and HCl (g) = 186. 7 at 298 K and 1 atm pressure. Then entropy change for the reaction :

H₂ ( g)+ Cl₂ (g) $\to$ 2HCl (g) is:

• +540.3

• +727.3

• -166.9

• +19.8

A certain sample of gas has a volume of 0.2 L measured at 1 a:tm pressure and 0°C. At the same pressure but 273°C, its volume will be :

• 0.4 L

• 0.8 L

• 27.8 L

• 55.6 L

Total number of atoms represented by the compound CuSO₄ · 5H₂O is :

• 27

• 21

• 5

• 8

When electrons are trapped into the crystal in anion vacancy, the defect is known as :

• Schottky defect

• Frenkel defect

• stoichiometric defect

• F-centres

What is the formula of bleaching powder?

• CaO(OCl)

• Ca(OCl)Cl

• Ca(OCl)₂

• Ca(OCl)₂Cl

By which one of the following compounds both CH₄ and CH₃ - CH₃ can be prepared in one step?

• CH₃I

• CH₃OH

• CH₃CH₂I

• C₂H₅OH

R - NH - COH $\underset{\mathrm{Pyridine}}{\overset{{\mathrm{POCl}}_3}{\to }}$ Product

In the given reaction, what will be the product?

• R - N = C = O

• R - $\stackrel{+}{\mathrm{N}}$ $\equiv$ C^-

• R - C $\equiv$ N

• None of these

Which of the following is secondary pollutant?

• CO₂

• N₂O

• PAN

• SO₂