21.

2X + 2Y $\mathrm{\to }$ 2Z

The equilibrium constant for the above reaction :

• $\frac{\left[2\mathrm{X}\right]\left[2\mathrm{Y}\right]}{\left[2\mathrm{Z}\right]}$

• $\frac{\left[\mathrm{X}\right]\left[\mathrm{Y}\right]}{\left[\mathrm{Z}\right]}$

• $\frac{[\mathrm{Z}{]}^2}{\left[\mathrm{X}{]}^2\right[\mathrm{Y}{]}^2}$

• $\frac{[\mathrm{Z}{]}^2}{\left[\mathrm{X}\right]\left[\mathrm{Y}\right]}$

The solubility product for XY is :

• s²

• 2s

• 4s²

• 2s

The probability of finding of three unpaired electron in nitrogen atom is defined by :

• Aufbau's principle

• Uncertainty principle

• Pauli's principle

• Hund's rule

In a reversible reaction ifthe concentration of reactants and products are doubled , the value of K_c will be :

• half of the initial value

• double of initial value

• one fourth of the initial value

• same the initial value

The number of $\mathrm{\sigma }$ (sigma) and $\mathrm{\pi }$ (pi) bonds in 1-buene-3-yne is :

• 5$\mathrm{\sigma }$ , 5$\mathrm{\pi }$

• 8$\mathrm{\sigma }$ , 6$\mathrm{\pi }$

• 7$\mathrm{\sigma }$ , 3$\mathrm{\pi }$

• 6$\mathrm{\sigma }$ , 4$\mathrm{\pi }$

The correct size ofiodine atom and iodine ion is :

• I^- > I⁺ > I

• I > I⁺ > I^-

• I > I^- > I⁺

• I⁺ > I > I^-

The geemetry of the compound of sp³d hybridisation is :

• pyramidal

• triangular

• planar

• trigonal bipyramidal

The compound formed by the ozonolysis of acetylene :

• glycol

• acetic acid

• ethylene ozonide

• glyoxal

The compound which have conjugate double bond :

• butyne

• butylene

• isobutylene

• butadiene

Which salt on heating, does not give brown gas on heating ?

• LiNO₃

• AgNO₃

• Pb(NO₃)₂

• KNO₃