Chemistry

Dinitrogen and dioxygen are main constituents of air, but these do not react with each other to form oxides of nitrogen because _________. 
(i) The reaction is endothermic and requires very high temperatures. 
(ii) The reaction can be initiated only in presence of a catalyst. 
(iii) Oxides of nitrogen are unstable. 
(iv) N₂ and O₂ are unreactive. 

The gaseous envelope around the earth is known as the atmosphere. The lowest layer of this is extended up to 10 km from sea level, this layer is _________. 
(i) Stratosphere 
(ii) Troposphere 
(iii) Mesosphere 
(iv) Hydrosphere 

Match the items given in Column I and Column I

Match the items given in Column I and Column I

Colligative properties are observed when _____________.

(i) A nonvolatile solid is dissolved in a volatile liquid.

(ii) A nonvolatile liquid is dissolved in another volatile liquid.

(iii) A gas is dissolved in nonvolatile liquid.

(iv) A volatile liquid is dissolved in another volatile liquid.

For a binary ideal liquid solution, the variation in total vapour pressure versus composition of solution is given by which of the curves?

In isotonic solutions ________________.

(i) Solute and solvent both are the same.

(ii) Osmotic pressure is the same.

(iii) Solute and solvent may or may not be same.

(iv) Solute is always same solvent may be different.

Which of the following binary mixtures will have same composition in liquid and vapour phase?

(i) Benzene-Toluene

(ii) Water-Nitric acid

(iii) Water-Ethanol

(iv) n-Hexane-n-Heptane

Isotonic solutions must have the same_____________.

(i) Solute

(ii) Density

(iii) Elevation in boiling point

(iv) Depression in freezing point

Van’t Hoff factor i is given by the expression _____________.

(i) i= $\mathit{}\frac{\mathbf{n}\mathbf{o}\mathbf{r}\mathbf{m}\mathbf{a}\mathbf{l}\mathbf{}\mathbf{m}\mathbf{o}\mathbf{l}\mathbf{a}\mathbf{r}\mathbf{}\mathbf{m}\mathbf{a}\mathbf{s}\mathbf{s}}{\mathbf{a}\mathbf{b}\mathbf{n}\mathbf{o}\mathbf{r}\mathbf{m}\mathbf{a}\mathbf{l}\mathbf{}\mathbf{m}\mathbf{o}\mathbf{l}\mathbf{a}\mathbf{r}\mathbf{}\mathbf{m}\mathbf{a}\mathbf{s}\mathbf{s}}$

(ii) i= $\mathit{}\frac{\mathbf{a}\mathbf{b}\mathbf{n}\mathbf{o}\mathbf{r}\mathbf{m}\mathbf{a}\mathbf{l}\mathbf{}\mathbf{m}\mathbf{o}\mathbf{l}\mathbf{a}\mathbf{r}\mathbf{}\mathbf{m}\mathbf{a}\mathbf{s}\mathbf{s}}{\mathbf{n}\mathbf{o}\mathbf{r}\mathbf{m}\mathbf{a}\mathbf{l}\mathbf{}\mathbf{m}\mathbf{o}\mathbf{l}\mathbf{a}\mathbf{r}\mathbf{}\mathbf{m}\mathbf{a}\mathbf{s}\mathbf{s}}$

(iii) i= $\mathit{}\frac{\mathbf{o}\mathbf{b}\mathbf{s}\mathbf{e}\mathbf{r}\mathbf{v}\mathbf{e}\mathbf{d}\mathbf{}\mathbf{c}\mathbf{o}\mathbf{l}\mathbf{l}\mathbf{i}\mathbf{g}\mathbf{a}\mathbf{t}\mathbf{i}\mathbf{v}\mathbf{e}\mathbf{}\mathbf{p}\mathbf{r}\mathbf{o}\mathbf{p}\mathbf{e}\mathbf{r}\mathbf{t}\mathbf{y}}{\mathbf{c}\mathbf{a}\mathbf{l}\mathbf{c}\mathbf{u}\mathbf{l}\mathbf{a}\mathbf{t}\mathbf{e}\mathbf{d}\mathbf{}\mathbf{c}\mathbf{o}\mathbf{l}\mathbf{l}\mathbf{i}\mathbf{g}\mathbf{a}\mathbf{t}\mathbf{i}\mathbf{v}\mathbf{e}\mathbf{}\mathbf{p}\mathbf{r}\mathbf{o}\mathbf{p}\mathbf{e}\mathbf{r}\mathbf{t}\mathbf{y}}$

(iv) i= $\frac{\mathbf{c}\mathbf{a}\mathbf{l}\mathbf{c}\mathbf{u}\mathbf{l}\mathbf{a}\mathbf{t}\mathbf{e}\mathbf{d}\mathbf{}\mathbf{c}\mathbf{o}\mathbf{l}\mathbf{l}\mathbf{i}\mathbf{g}\mathbf{a}\mathbf{t}\mathbf{i}\mathbf{v}\mathbf{e}\mathbf{}\mathbf{p}\mathbf{r}\mathbf{o}\mathbf{p}\mathbf{e}\mathbf{r}\mathbf{t}\mathbf{y}}{\mathbf{o}\mathbf{b}\mathbf{s}\mathbf{e}\mathbf{r}\mathbf{v}\mathbf{e}\mathbf{d}\mathbf{}\mathbf{c}\mathbf{o}\mathbf{l}\mathbf{l}\mathbf{i}\mathbf{g}\mathbf{a}\mathbf{t}\mathbf{i}\mathbf{v}\mathbf{e}\mathbf{}\mathbf{p}\mathbf{r}\mathbf{o}\mathbf{p}\mathbf{e}\mathbf{r}\mathbf{t}\mathbf{y}}$