In which of the following compound sp² hybridisation is absent ?

• CH ≡ C - CH = CH₂

• CH ≡ C - CH₂ - CH₃

• CH₃ - CH = CH₂

• CH₂ = CH - CH₂ - CH₃

How many electron pairs are present in valence shell of oxygen in water molecule ?

• 4

• 1

• 2

• 3

C - Cl bond is stronger than C - I bond because

• C - Cl bond is more ionic than C - I

• C - Cl bond is more ionic than C - I

• C -Cl bond is more covalent than C - I

• C - Cl bond length is longer than C - I

Number of unpaired electrons in sulphur is

• 2

• 6

• 8

• 1

100 mL of 0.01 M solution of NaOH is diluted to 1 dm³. What is the pH of the diluted solution?

• 12

• 11

• 2

• 3

Relation between hydrolysis constant and dissociation constant are given. Which is the correct formula for MgCl₂ ?

• K_h = $\frac{{\mathrm{K}}_{\mathrm{w}}}{{\mathrm{K}}_{\mathrm{a}}}$

• K_h = $\frac{{\mathrm{K}}_{\mathrm{w}}}{{\mathrm{K}}_{\mathrm{b}}}$

• K_h = $\frac{{\mathrm{K}}_{\mathrm{w}}}{{\mathrm{K}}_{\mathrm{a} }\times {\mathrm{K}}_{\mathrm{b}}}$

• K_w = $\frac{{\mathrm{K}}_{\mathrm{h}}}{{\mathrm{K}}_{\mathrm{b}}}$

Calculate pOH of 0.001 M NH₄OH when it is 1% dissociated in the solution.

• 5

• 2.96

• 9.04

• 11.04

Heat of neutralization will be minimum for which of the following combination?

• NaOH + H₂SO₄

• NH₄OH + CH₃COOH

• NaOH + HCl

• NaOH + CH₃COOH

The values of dissociation constant of bases are given below. Which is the weakest base?

• 1.8 × 10^-5

• 4.8 × 10^-10

• 7.2 × 10^-11

• 7.07 × 10^-7

2 moles of helium gas expanded isothermally and irreversible at 27°C from volume 1 dm³ to 1 m³ at constant pressure of 100 kPa. Calculate the work done.

• 99900 kJ

• 99900 J

• 34464.65 kJ

• 34464.65 J