The pH of the solution obtained on neutralisation of 40 mL 0.1 M NaOH with 40 mL 0.1 M CH₃COOH is

• 7

• 8

• 6

• 3

Inert gases are mixed in iodine vapours. Then there are _____ between them.

• H-bonding

• van der Waals forces

• electrostatic forces

• metallic bonds

The order of bond length is

• O₂ < O₃ < O${}_2^{2-}$

• O₂ < O${}_2^{2-}$ < O₃

• O${}_2^{2-}$ < O₃ < O₂

• O₂ = O${}_2^{2-}$ > O₃

Largest difference in radii is found in case of the pair

• Li, Na

• Na, K

• K, Rb

• Rb, Cs

X-rays are emitted during

• $\mathrm{\alpha }$, n reaction

• K-capture

• n, $\mathrm{\alpha }$-reaction

• $\mathrm{\beta }$- emission 

6.

In P versus V graph, the horizontal line is found in which exists

• Gas

• Liquid

• Equilibrium between gas and liquid

• Super critical temperature

During estimation of nickel, we prepare nickel dimethylglyoxime, a scarlet red solid. This compound is

• ionic

• covalent

• metallic

• non-ionic complex

Critical temperatures for A, B, C and D gases are 25°C, 10°C, -80°C and 15°C respectively. Which gas will be liquefied more easily?

• A

• B

• C

• D

During titration of acetic acid with aqueous NaOH solution, the neutralisation graph has a vertical line. This line indicates

• alkaline nature of equivalence

• acidic nature of equivalence

• neutral nature of equivalence

• depends on experimental proceeding

Calculate change in internal energy if $∆$H = - 92.2 kJ, P = 40 atm and $∆$V = -1L.

• -42 kJ

• -88 kJ

• +88 kJ

• +42 kJ