21.

Which one of the following is conjugate acid of water in the reaction?

H₂SO₄ + H₂O $\rightleftharpoons$ H₃O⁺ + HSO${}_4^{-}$

• H₂O

• H₃O⁺

• SO${}_4^{2-}$

• HSO${}_4^{-}$

The product of H⁺ and OH^- of water will be

• K_w = 10^-12

• K_w = 10^-14

• K_w = 10^-11

• K_w = 10^-10

For NaCl, the K_sp = 36mol² L^-2, the molar concentration of it will be  

• $\frac{1}{36}$M

• $\frac{1}{16}$ M

• 36 M

• 6 M

Which of the following can be used to convert ${}_7{}^{14}\mathrm{N}$ into ${}_8{}^{17}\mathrm{O}$?

• Deutron

• Proton

• α-particle

• Neutron

First ionisation potential is highest for

• Na

• Mg

• Al

• None of these

In the equilibrium reaction 2HI (g) $\rightleftharpoons$ H₂ + I₂ which of the following expressions is true?

• K_p = K_c

• K_c = 2K_p

• K_p > K_c

• K_c = K_p (RT)²

In the following, the element with the highest electropositivity is

• copper

• cesium

• barium

• chromium

Which of the following describes the shape of orbital?

• Principal quantum number

• Azimuthal quantum number

• Magnetic quantum number

• Spin quantum number

Strongest Bronsted base among the following anions is:

• ClO^-

• ClO${}_2^{-}$

• ClO${}_3^{-}$

• ClO${}_4^{-}$

Which of the following has zero dipole moment?

• ClF

• PCl₃

• SiF₄

• CFCl₃