In the reaction :

H₂ + I₂ $\rightleftharpoons$ 2HI

In a 2 litre flask 0.4 moles of each H₂ and I₂ are taken .At equilibrium 0.5 moles of HI are formed .What will be the value of equilibrium constant ,K_c ?

• 20.2

• 25.4

• 0.284

• 11.11

40 mL of 0.1 M ammonia solution is mixed with 20 mL. of 0.1 M HCl. What is the pH of the mixture? (pK_b, of ammonia solution is 4.74)

• 4.74

• 2.26

• 9.26

• 5.00

KI and CuSO₄ solution when mixed , give :

• CuI₂ + K₂SO₄

• Cu₂I₂ + K₂SO₄

• K₂SO₄ + Cu₂I₂ + I₂

• K₂SO₄ + CuI₂ + I₂

Which of the following is a Lewis base ?

• NaOH

• NH₃

• BCl₃

• All of these

205.

For a phase change

${\mathrm{H}}_2{\mathrm{O}}_{\left(\mathrm{l}\right)} \underset{0^{°}\mathrm{C}, 1 \mathrm{bar}}{\rightleftharpoons } {\mathrm{H}}_2{\mathrm{O}}_{\left(\mathrm{s}\right)}$

• $∆\mathrm{G} = 0$

• $∆\mathrm{H} = 0$

• $∆\mathrm{S} =0$

• $∆\mathrm{U} = 0$

F₂ formed by reacting K₂MnF₆ with

• SbF₅

• MnF₃

• KSbF₆

• MnF₄

Which among the following is the strongest acid ?

• HF

• HCl

• HBr

• HI

When 10 mL of 0.1 M acetic acid (pK_a = 5.0) is titrated against 10 ml of 0.1 M ammonia solution (pK_b = 5.0), the equivalence point occurs at pH

• 5.0

• 6.0

• 7.0

• 9.0

For reaction, 2NOCl _(g) $\rightleftharpoons$2NO _(g) + Cl_2 (g), K_c at 427°C is 3 × 10^-6 L mol^-1. The value of K_p is nearly

• 7.50 × 10^-5

• 2.50 × 10^-5

• 2.50 × 10^-4

• 1.75 × 10^-4

For the chemical equilibrium,

CaCO_3(s) $\rightleftharpoons$CaO_(s) + CO_2(g)

$∆{\mathrm{H}}_{\mathrm{r}}^{°}$ can be determined from which one of the following plots?