Oxidizing Nature of Sulphuric Acid

Q.

Identify the oxidized and reduced compound in the given reaction $\underset{\mathrm{Copper}\mathrm{oxide}}{\mathrm{CuO}\left(\mathrm{s}\right)}+\underset{\mathrm{Hydrogen}\mathrm{gas}}{{\mathrm{H}}_2\left(\mathrm{g}\right)}\to \underset{\mathrm{Copper}}{\mathrm{Cu}\left(\mathrm{s}\right)}+\underset{\mathrm{Water}}{{\mathrm{H}}_2\mathrm{O}\left(\mathrm{l}\right)}$

Q.

Match list-I with list-II

Column 1	Column 2
Hypophosphorous acid	$+5$
Orthophosphoric acid	$+4$
Hypophosphoric acid	$+3$
Orthophosphorous acid	$+1$

Q. The boiling points of $HF,HCl,HBr$ and $HI$ follows the order:

1. $HF>HCl>HBr>HI$
2. $HF>HI>HBr>HCl$
3. $HI>HBr>HCl>HF$
4. $HCl>HF>HBr>HI$

Q. In Kjeldahl's method of estimation of nitrogen, $K_{2}S{O}_4$ acts as:

1. Catalytic agent
2. Boiling point elevator
3. Hydrolysis agent
4. Oxidizing agent

Q.

Identify the oxidized and reduced substances in the following reactions.

H₂(g) + Cl₂(g) $\to$ 2HCl(g)

Q. Arrange the following in the decreasing order of boiling point:
(i) $C_2{H}_{5}OH$
(ii) $(C{H}_3{)}_{2}NH$
(iii) $C_2{H}_{5}N{H}_2$

1. $i>ii>iii$
2. $ii>i>iii$
3. $i>iii>ii$
4. $iii>ii>i$

Q.

Which statement is incorrect for the reaction $\mathrm{CuO}+{\mathrm{H}}_2\to \mathrm{Cu}+{\mathrm{H}}_2\mathrm{O}$

1. CuO is reduced

2. ${\mathrm{H}}_2$ is oxidized

3. CuO is reduced and ${\mathrm{H}}_2$ is oxidized

4. Both CuO and ${\mathrm{H}}_2$ are oxidized

Q. $H_2{O}_2$ has the higher boiling point than water due to stronger hydrogen bonding.

1. True
2. False

Q. Assign reason for the following:
(i) $H_{3}P{O}_2$ is a stronger reducing agent than $H_{3}P{O}_4$.
(ii) Sulphur shows more tendency for catenation than Oxygen.
(iii) Reducing character increases from $HF$ to $HI$.

Q. What is the correct order of boiling point?

1. $H_{2}O<H_{2}S<H_{2}Se<H_{2}Te$
2. $H_{2}O<H_{2}Se<H_{2}Te<H_{2}S$
3. $H_{2}O>H_{2}S>H_{2}Se>H_{2}Te$
4. $H_{2}O>H_{2}Te>H_{2}Se>H_{2}S$

Q. The correct order of boiling points for the given halides is:

1. $CC{l}_4<C{H}_{3}Cl<C{H}_{2}C{l}_2<CHC{l}_3$
2. $CHC{l}_3<C{H}_{2}C{l}_2<C{H}_{3}Cl<CC{l}_4<$
3. $CC{l}_4<CHC{l}_3<C{H}_{2}C{l}_2<C{H}_{3}Cl$
4. $C{H}_{3}Cl<C{H}_{2}C{l}_2<CHC{l}_3<CC{l}_4$

Q. Which one of the following has the highest bond energy?

1. $O-O$
2. $S-S$
3. $Se-Se$
4. $Te-Te$

Q. Find the oxidation state of sulphur in $H_{2}S{O}_4$.

1. 6
2. 4
3. 3
4. 2

Q. In which of the following reactions conc. $H_{2}S{O}_4$ is used as an oxidising reagent?

1. $Ca{F}_2+H_{2}S{O}_4\to CaS{O}_4+2HF$
2. $2HI+H_{2}S{O}_4\to I_2+S{O}_2+2H_{2}O$
3. $Cu+2H_{2}S{O}_4\to CuS{O}_4+S{O}_2+2H_{2}O$
4. $NaCl+H_{2}S{O}_4\to NaHS{O}_4+HCl$

Q. Electrolysis of $H_{2}S{O}_4$ produces _______at anode.

1. $H_2$
2. $O_2$
3. $H_2{S}_2{O}_8$
4. $H_2{S}_2{O}_3$

Q. In a mixture of concentrated $H_{2}S{O}_4$ and $HN{O}_3$ intermediate formed is:

1. $H_{2}S{O}_4^{+}$
2. $S{O}_4^{2-}$
3. $H_{2}N{O}_3^{-}$
4. $H_{2}N{O}_3^{+}$

Q. Assertion :Bond dissociation energy of $F_2$ is smaller than that of ${Cl}_2$. Reason: Bond dissociation energy is in order $F_2<{Cl}_2<{Br}_2<I_2$.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

Q. Which one of the following has the highest bond energy?

1. $Se-Se$
2. $Te-Te$
3. $O-O$
4. $S-S$

Q. The decreasing order of bond dissociation energy among halogens is:

1. $F-F>Cl$ -$Cl>B$r - $B$r $>I-I$
2. $Cl$ -$Cl>B$r - $B$r $>F-F>I-I$
3. $Cl$ -$Cl>B$r - $B$r $>I-I>F-F$
4. $I-I>F-F>Cl$ -$Cl>B$r - $B$r

Q. Which reaction represents the oxidising behaviour of $H_{2}S{O}_4$?

1. $NaCl+H_{2}S{O}_4⟶NaHS{O}_4+HCl$
2. $2NaOH+H_{2}S{O}_4⟶{Na}_{2}S{O}_4+2H_{2}O$
3. $2HI+H_{2}S{O}_4⟶I_2+S{O}_2+2H_{2}O$
4. $2P{Cl}_5+H_{2}S{O}_4⟶2PO{Cl}_3+S{O}_2{Cl}_2+2HCl$

Q. The following is a graph plotted between the vapour pressure of two volatile liquids against their respective mole fractions. Which of the following statements are correct?

1. When $x_A=1and{x}_B=0,thenP=P_A^0$
2. When $x_B=1and{x}_A=0,thenP=P_B^0$
3. When $x_A=1and{x}_B=0,thenP<P_B^0$
4. When $x_B=1and{x}_A=0,thenP>P_A^0$

Q. Give at least one example to explain the following property:
Conc. $H_{2}S{O}_4$ acts as an oxidising agent.

Q. The bond order of the underlined species $NOHS{O}_4$ is

Q. Assertion :Boiling point of HF is less than water . Reason: Hydrogen bonding in water is weaker than HF.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Both Assertion and Reason are incorrect

Q. Concentrated $H_{2}S{O}_4$ cannot be used to prepare $HBr$ or $HI$ from $KBr$ or $KI$ because it:

1. reduces $HBr$ or $HI$
2. reacts too slowly with $KBr$ or $KI$
3. oxidises $HBr$ or $HI$
4. oxidises $KBr$ to $KBr{O}_3$ or $KI$ to $KI{O}_3$

Q. What type of hydrogen bonding exist in liquid water?

Q. Explain the following observation giving appropriate reasons:
The $HEH$ bond angle of then hydrides of group $15$ elements decreases as we move down the group.

Q. Which of the following chemical reactions depicts the oxidising behaviour of $H_{2}S{O}_4$?

1. $2PC{l}_5+H_{2}S{O}_4\to 2POC{l}_3+2HCl+S{O}_{2}C{l}_2$
2. $2HI+H_{2}S{O}_4\to I_2+S{O}_2+2H_{2}O$
3. $Ca(OH{)}_2+H_{2}S{O}_4\to CaS{O}_4+2H_{2}O$
4. $NaCl+H_{2}S{O}_4\to NaHS{O}_4+HCl$

Q. Arrange the following in the decreasing order of boiling point:
(i) $C_2{H}_{5}OH$
(ii) $(C{H}_3{)}_{2}NH$
(iii) $C_2{H}_{5}N{H}_2$

1. $iii>ii>i$
2. $i>ii>iii$
3. $i>iii>ii$
4. $ii>i>iii$

Q. In which of the following sulphur is present in +5 oxidation state?

1. Dithionic acid
2. Sulphurous acid
3. Sulphuric acid
4. Disulphuric acid