35.4 ml of HCl is required for the neutralization of a solution containing 0.275 g of sodium hydroxide. The normality of hydrochloric acid is ?

• 0.97 N

• 0.142 N

• 0.194 N

• 0.244 N

The value of amu is which of the following ?

• 1.57 × 10^-24 kg

• 1.66 × 10^-24 kg

• 1.99 × 10^-23 kg

• 1.66 × 10^-27 kg

The molecule having largest dipole moment among the following is :

• CHI₃

• CH₄

• CHCl₃

• CCl₄

Which one of the following has unit positive charge and 1 amu mass ?

• Electron

• Neutron

• Proton

• None of these

Which one of the following pair shows Buffer's solution?

• NaCl + NaOH

• CH₃COONa + CH₃COOH

• CH₃COOH + CH₃COONH₄

• H₂SO₄ + CuSO₄

Which of the following chloride is water insoluble?

• HCl

• AgCl

• Both 'a' and 'b'

• None of these

By dissolving 5 g substance in 50 g of water, the decrease in freezing point is 1.2°C. The gram molal depression is 1.85°C. The molecular weight of substance is :

• 105.4

• 118.2

• 137.2

• 154.2

8.

Which is correct for an enothermic reaction?

• $∆$H is positive

• $∆$H is negative

• $∆$E is negative

• $∆$H= zero

The radius of hydrogen atom is 0.53 Å. The radius of ₃Li²⁺ is of:

• 1.27 Å

• 0.17 Å

• 0.57 Å

• 0.99 Å

The correct sequence of hybridisation of methane, ethene and acetylene is :

• sp, sp², sp³

• sp², sp³, sp

• sp³, sp², sp

• sp³, sp, sp²