1.

Increasing order (lowest first) for the values of e/m for electron (e), proton (p), neutron (n) and α-particles is

• e, p, n, α

• n, α, p, e

• n, p, e, α

• n, p, α, e

A particle moving with a velocity 10⁶ m/s will have de-Broglie wavelength nearly [Given, m= 6.62 × 10^-27 kg, h =  6.62 × 10^-34 J-s]

• 10^-9m

• 10^-13 m

• 10^-19 m

• 1 Å

Bohr's radius of 2^nd orbit of Be³⁺ is equal to that of

• 4^th orbit of hydrogen

• 2^nd orbit of He⁺

• 3^rd orbit of Li²⁺

• first orbit of hydrogen

The temperature, at which a gas shows maximum ideal behaviour, is known as

• Boyle's temperature

• inversion temperature

• critical temperature

• absolute temperature

Which of the following is a wrong statement about equilibrium state?

• Rate of forward reaction=Rate of backward reaction

• Equilibrium is dynamic

• Catalysts increase value of equilibrium constant

• Free energy change is zero

A + B $\rightleftharpoons$C + D. Initially moles of A and B are equal. At equilibrium, moles of C are three times that of A. The equilibrium constant of the reaction will be

• 1

• 3

• 4

• 9

$\mathrm{If} \mathrm{for} {\mathrm{N}}_2 + 3{\mathrm{H}}_2 \rightleftharpoons 2{\mathrm{NH}}_3, {\mathrm{K}}_{\mathrm{eq}} = 1.6 \times {10}^{-5},$ then the value of K_eq for the reaction ${\mathrm{NH}}_3 \rightleftharpoons \frac{1}{2}{\mathrm{N}}_2+ \frac{3}{2}{\mathrm{H}}_2 \mathrm{will} \mathrm{be}$

• 6.25

• 25

• 250

• 500

A weak acid HX has dissociation constant 10^-5. The pH of 0.1 M solution of this acid will be

• 2

• 3

• 4

• 5

Which of the following is not a buffer solution?

• 100 mL 0.1 M CH₃COOH+ 50 mL 0.1 M CH₃COONa

• 100 mL 0.1 M CH₃COOH+ 50 mL 0.1 M  NaOH

• 50 mL 0.1 M CH₃COOH+ 100 mL 0.1 M  NaOH

• 100 mL 0.1 M NH₄OH+ 50 mL 0.1 M  HCl

If K_sp Of Ag₂S is 10^-17, the solubility of Ag₂S in 0.1 M solution of Na₂S will be

• 10^-8

• 5 × 10^-9

• 10^-15

• 10^-16