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21.

The species in which  the N-atom is in a state of sp hybridization is


A) $NO_{2}^{-}$

B) $NO_{3}^{-}$

C) $NO_{2}$

D) $NO_{2}^{+}$



22.

For a linear plot of log (x/ m)versus log p in a Freundlich adsorption isotherm, which of the following statements is correct? (k and n are constants)


A) 1/n appears as the intercept

B) Only 1/n appears as the slope

C) $log\left(\frac{1}{n}\right)$ appears as the intercept

D) Both k and 1/n appear in the slope term



23.

The distillation technique most suited to separating glycerol from spent lye rn the soap industry is


A) fractional distillation

B) steam distillation

C) distillation under reduce pressure

D) simple distilation



24.

18 g of glucose (C6H12O6) is added to 178.2 g water. The vapor pressure of water (in torr) for this aqueous solution


A) 76.0

B) 752.4

C) 759

D) 7.6



25.

 Which of the following compounds is metallic and ferromagnetic?


A) $CrO_{2}$

B) $VO_{2}$

C) $MnO_{2}$

D) $TiO_{2}$



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