31.

Which halogen forms only one oxoacid (HOX)?

• F

• Cl

• Br

• I

Which is correct regarding acidity?

• H₂S <H₂Se

• H₂S> H₂Se

• H₂Se > H₂Te

• None of these.

Slag formed in blast furnace, removes the impurity of

• SiO₂

• CaO

• CO₂

• FeO

When CO₂ is passed through solution of sodium aluminate, precipitate of which compound is formed?

• Al(OH)₃

• Al₂O₃

• Na₂CO₃

• No ppt

Purification of colloids is done by

• dialysis

• peptisation

• electrophoresis

• coagulation.

In presence of acidic medium, KMnO₄ converts H₂S into

• Mn only

• MnS only

• MnS + S

• S only

75% of a zero order reaction complete in 4 h 87.5% of the same reaction completes in

• 6h

• 12h

• 8h

• 2h

For the reaction A_(g)$\to$B_{( g)}+ C_(g), the rate constant is given as (P_i is initial pressure and P_t is pressure at time t)

• $k=\frac{2.303}{\mathrm{t}}\log \frac{{\mathrm{P}}_{\mathrm{i}}}{{\mathrm{P}}_{\mathrm{t}}}$

• $k=\frac{2.303}{\mathrm{t}}\log \frac{{\mathrm{P}}_{\mathrm{i}}}{(2{\mathrm{P}}_{\mathrm{i}}-{\mathrm{P}}_{\mathrm{t}})}$

• $k=\frac{2.303}{\mathrm{t}}\log \frac{2{\mathrm{P}}_{\mathrm{i}}-{\mathrm{P}}_{\mathrm{t}}}{{\mathrm{P}}_{\mathrm{i}}}$

• $k=\frac{2.303}{\mathrm{t}}\log \frac{{\mathrm{P}}_{\mathrm{i} }-{\mathrm{P}}_{\mathrm{t}}}{2{\mathrm{P}}_{\mathrm{i}}}$

The value of Henry's constant K_H is

• greater for gases with higher solubility

• greater for gases with lower solubility

• constant for all gases

• not related to the solubility of gases.

Which cell will measure standard electrode potential of copper electrode?

• ${\text{Pt}}_{\left(s\right)}\left|H_{2(g, 0.1 bar)}\right| H_{(a.q., 1M)}^{+}\left|\right| C{u}_{(a.q.,1M)}^{2+}|C{u}_{\left(s\right)}$

• ${\text{Pt}}_{\left(s\right)}| H_{2(g, 1bar)}|H_{(a.q.,1 M)}^{+}\left|\right| C{u}_{(a.q., 1M)}^{2+}| C{u}_{\left(s\right)}$

• ${\text{Pt}}_{\left(s\right)}| H_{2(g, 1bar) }|H_{(a.q., 1M)}^{+}\left|\right|C{u}_{(a.q., 1M)}^{2+}|C{u}_{\left(s\right)}$

• ${\text{Pt}}_{\left(s\right)}| H_{2(g, 1 bar)}|H_{(a.q., 0.1M)}^{+}\left|\right|C{u}_{(a.q., 1M)}^{}|C{u}_{\left(s\right)}$