Question 1: Palette 1/40

DPT MCQ

1. The oxidation numbers of C in HCN and HNC, respectively, are

A

$+2, +2$

B

$+2, +4$

C

$+4, +4$

D

$-2, -2$

Question 2: Palette 2/40

DPT MCQ

2. The oxidation number of $\text{K}$ in $\text{KO}_2$ is:

A

$+4$

B

$+1$

C

$+\frac{1}{2}$

D

$-\frac{1}{2}$

Question 3: Palette 3/40

DPT MCQ

3. What is the oxidation state of Xe in $\text{Ba}_2\text{XeO}_6$?

A

0

B

+4

C

+6

D

+8

Question 4: Palette 4/40

DPT MCQ

4. When $\text{K}_2\text{Cr}_2\text{O}_7$ is converted into $\text{K}_2\text{CrO}_4$, the change in oxidation number of $\text{Cr}$ is

A

0

B

6

C

4

D

3

Question 5: Palette 5/40

DPT MCQ

5. In the reaction $3\text{Br}_2 + 6\text{CO}_3^{2-} + 3\text{H}_2\text{O} \rightarrow 5\text{Br}^- + \text{BrO}_3^- + 6\text{HCO}_3^-$, which statement is correct?

A

Bromine is oxidized and carbonate is reduced.

B

Bromine is oxidized and water is reduced.

C

Bromine is both oxidized and reduced.

D

Bromine is neither oxidized nor reduced.

Question 6: Palette 6/40

DPT MCQ

6. Which of the following reaction is not a disproportionation reaction?

A

$\text{Br}_2 + \text{CO}_3^{2-} + \text{H}_2\text{O} \rightarrow \text{Br}^- + \text{BrO}_3^- + \text{HCO}_3^-$

B

$\text{P}_4 + \text{OH}^- + \text{H}_2\text{O} \rightarrow \text{PH}_3 + \text{H}_2\text{PO}_2^-$

C

$\text{H}_2\text{S} + \text{SO}_2 \rightarrow \text{S} + \text{H}_2\text{O}$

D

$\text{H}_2\text{O}_2 \rightarrow \text{H}_2\text{O} + \text{O}_2$

Question 7: Palette 7/40

DPT MCQ

7. For the redox reaction,
$\text{Zn} + \text{NO}_3^- \rightarrow \text{Zn}^{2+} + \text{NH}_4^+$
in basic medium, the coefficients of $\text{Zn}$, $\text{NO}_3^-$, and $\text{OH}^-$ in the balanced equation, respectively, are:

A

4, 1, 7

B

7, 4, 1

C

4, 1, 10

D

1, 4, 10

Question 8: Palette 8/40

DPT MCQ

Find the n-factor for the following chemical change: $\text{KMnO}_4 \xrightarrow{\text{H}^+} \text{Mn}^{2+}$

A

2

B

3

C

5

D

7

Question 9: Palette 9/40

DPT MCQ

Find the n-factor for the following chemical change: $\text{KMnO}_4 \xrightarrow{\text{H}_2\text{O}} \text{Mn}^{4+}$

A

1

B

3

C

4

D

7

Question 10: Palette 10/40

DPT MCQ

Find the n-factor for the following chemical change: $\text{KMnO}_4 \xrightarrow{\text{OH}^- \text{ (Conc. basic medium)}} \text{Mn}^{6+}$

A

1

B

5

C

6

D

7

Question 11: Palette 11/40

DPT MCQ

Find the n-factor for the following chemical change: $\text{K}_2\text{Cr}_2\text{O}_7 \xrightarrow{\text{H}^+} \text{Cr}^{3+}$

A

3

B

6

C

12

D

18

Question 12: Palette 12/40

DPT MCQ

Find the n-factor for the following chemical change: $\text{C}_2\text{O}_4^{2-} \rightarrow \text{CO}_2$

A

1

B

2

C

3

D

4

Question 13: Palette 13/40

DPT MCQ

Find the n-factor for the following chemical change: $\text{FeSO}_4 \rightarrow \text{Fe}_2\text{O}_3$

A

1

B

2

C

3

D

4

Question 14: Palette 14/40

DPT MCQ

Find the n-factor for the following chemical change: $\text{FeSO}_4 \rightarrow \text{Fe}_2\text{O}_3$

A

1

B

2

C

3

D

4

Question 15: Palette 15/40

DPT MCQ

10. Suppose that there are three atoms $\text{A}$, $\text{B}$, and $\text{C}$ whose oxidation numbers are $+6$, $-1$, and $-2$, respectively. What will be the molecular formula of the compound?

A

$\text{AB}_2\text{C}_2$

B

$\text{A}_2\text{BC}_3$

C

$\text{AB}_3\text{C}_2$

D

$\text{ABC}_3$

Question 16: Palette 16/40

DPT MCQ

Calculate the normality of a solution containing $15.8\text{ g}$ of $\text{KMnO}_4$ in $50\text{ mL}$ of acidic solution.

A

$5\text{ N}$

B

$10\text{ N}$

C

$2\text{ N}$

D

$1\text{ N}$

Question 17: Palette 17/40

DPT MCQ

Calculate the normality of a solution containing $50\text{ mL}$ of $5\text{ M}$ solution $\text{K}_2\text{Cr}_2\text{O}_7$ in acidic medium.

A

$15\text{ N}$

B

$30\text{ N}$

C

$5\text{ N}$

D

$10\text{ N}$

Question 18: Palette 18/40

DPT MCQ

Find the number of moles of $\text{KMnO}_4$ needed to oxidize one mole of $\text{Cu}_2\text{S}$ in acidic medium according to the reaction $\text{KMnO}_4 + \text{Cu}_2\text{S} \rightarrow \text{Mn}^{2+} + \text{Cu}^{2+} + \text{SO}_2$.

A

$0.8$

B

$1.6$

C

$2.4$

D

$3.2$

Question 19: Palette 19/40

DPT MCQ

In a reaction vessel, $1.184\text{ g}$ of $\text{NaOH}$ is required to be added for completing the reaction. How many millilitres of $0.15\text{ M}$ $\text{NaOH}$ should be added for this requirement?

A

$197.33\text{ mL}$

B

$150.00\text{ mL}$

C

$250.50\text{ mL}$

D

$120.25\text{ mL}$

Question 20: Palette 20/40

DPT MCQ

Which of the following statement(s) is/are correct?
(a) $\text{gram molecular weight} = \text{molecular weight in grams} = \text{weight of } 6.022 \times 10^{23} \text{ molecules}$
(b) $1\text{ mole} = N_A \text{ molecules} = 6.022 \times 10^{23} \text{ molecules}$
(c) $1\text{ mole} = 1\text{ gram-molecule}$
(d) All of the above

A

(a) and (b) only

B

(b) and (c) only

C

(a) and (c) only

D

All of the above

Question 21: Palette 21/40

DPT MCQ

Which of the following reactions represents the oxidising behaviour of $\text{H}_2\text{SO}_4$?

A

$\text{2PCl}_3 + \text{H}_2\text{SO}_4 \rightarrow \text{2POCl}_3 + \text{2HCl} + \text{SO}_2\text{Cl}_2$

B

$\text{2NaOH} + \text{H}_2\text{SO}_4 \rightarrow \text{Na}_2\text{SO}_4 + \text{2H}_2\text{O}$

C

$\text{NaCl} + \text{H}_2\text{SO}_4 \rightarrow \text{NaHSO}_4 + \text{HCl}$

D

$\text{2HI} + \text{H}_2\text{SO}_4 \rightarrow \text{I}_2 + \text{SO}_2 + \text{2H}_2\text{O}$

Question 22: Palette 22/40

DPT MCQ

In which of the following reactions does $\text{H}_2\text{O}_2$ act as a reducing agent?

A

$\text{2FeCl}_3 + \text{2HCl} + \text{H}_2\text{O}_2 \rightarrow \text{2FeCl}_2 + \text{2H}_2\text{O}$

B

$\text{Cl}_2 + \text{H}_2\text{O}_2 \rightarrow \text{2HCl} + \text{O}_2$

C

$\text{2HI} + \text{H}_2\text{O}_2 \rightarrow \text{I}_2 + \text{2H}_2\text{O}$

D

$\text{H}_2\text{SO}_5 + \text{H}_2\text{O}_2 \rightarrow \text{H}_2\text{SO}_4 + \text{H}_2\text{O}$

Question 23: Palette 23/40

DPT MCQ

Which of the following reaction involves neither oxidation nor reduction?

A

$\text{CrO}_4^{2-} \rightarrow \text{Cr}_2\text{O}_7^{2-}$

B

$\text{Cr} \rightarrow \text{CrCl}_3$

C

$\text{Na} \rightarrow \text{Na}^+$

D

$2\text{S}_2\text{O}_3^{2-} \rightarrow \text{S}_4\text{O}_6^{2-}$

Question 24: Palette 24/40

DPT MCQ

5. When the reaction $\text{H}_2\text{O}_2 + \text{MnO}_4^- \rightarrow \text{Mn}^{2+} + \text{O}_2$ is balanced in acidic medium, the coefficients of $\text{H}^+$, $\text{H}_2\text{O}_2$, and $\text{MnO}_4^-$, respectively, are:

A

6, 5, 2

B

2, 5, 6

C

8, 3, 2

D

4, 2, 5

Question 25: Palette 25/40

DPT MCQ

5 (b). Balance the following redox reaction: $\text{Zn} + \text{HNO}_3\text{(dil)} \rightarrow \text{Zn(NO}_3\text{)}_2 + \text{H}_2\text{O} + \text{NH}_4\text{NO}_3$. What are the stoichiometric coefficients of $\text{Zn}$, $\text{HNO}_3$, and $\text{Zn(NO}_3\text{)}_2$ in the balanced chemical equation, respectively?

A

4, 10, 4

B

1, 4, 1

C

4, 8, 4

D

2, 10, 2

Question 26: Palette 26/40

DPT MCQ

5 (c). Balance the following redox reaction: $\text{CrI}_3 + \text{KOH} + \text{Cl}_2 \rightarrow \text{K}_2\text{CrO}_4 + \text{KIO}_4 + \text{KCl} + \text{H}_2\text{O}$. What are the stoichiometric coefficients of $\text{CrI}_3$, $\text{KOH}$, and $\text{Cl}_2$ in the balanced chemical equation, respectively?

A

2, 64, 27

B

1, 32, 14

C

2, 32, 27

D

4, 64, 54

Question 27: Palette 27/40

DPT MCQ

5 (d). Balance the disproportionation reaction equation: $\text{P}_2\text{H}_4 \rightarrow \text{PH}_3 + \text{P}_4$. What are the stoichiometric coefficients of $\text{P}_2\text{H}_4$, $\text{PH}_3$, and $\text{P}_4$ in the balanced equation, respectively?

A

6, 8, 1

B

3, 4, 1

C

6, 4, 2

D

2, 3, 1

Question 28: Palette 28/40

DPT MCQ

5 (e). Balance the redox reaction equation: $\text{Ca}_3(\text{PO}_4)_2 + \text{SiO}_2 + \text{C} \rightarrow \text{CaSiO}_3 + \text{P}_4 + \text{CO}$. What are the stoichiometric coefficients of $\text{Ca}_3(\text{PO}_4)_2$, $\text{SiO}_2$, $\text{C}$, $\text{CaSiO}_3$, $\text{P}_4$, and $\text{CO}$ in the balanced chemical equation, respectively?

A

2, 6, 10, 6, 1, 10

B

1, 3, 5, 3, 1, 5

C

2, 3, 10, 3, 1, 10

D

4, 12, 20, 12, 2, 20

Question 29: Palette 29/40

DPT MCQ

6. The number of electrons required to balance the following equation are:
$\text{NO}_3^- + 4\text{H}^+ \rightarrow 2\text{H}_2\text{O} + \text{NO}$

A

2 on right side

B

3 on left side

C

3 on right side

D

5 on left side

Question 30: Palette 30/40

DPT MCQ

7. $2\text{KMnO}_4 + 5\text{H}_2\text{S} + 6\text{H}^+ \rightarrow 2\text{Mn}^{2+} + 2\text{K}^+ + 5\text{S} + 8\text{H}_2\text{O}$. In the above reaction, how many moles of electrons would be involved in the oxidation of $1\text{ mole}$ of reductant?

A

Two

B

Five

C

Ten

D

One

Question 31: Palette 31/40

DPT MCQ

7. $2\text{KMnO}_4 + 5\text{H}_2\text{S} + 6\text{H}^+ \rightarrow 2\text{Mn}^{2+} + 2\text{K}^+ + 5\text{S} + 8\text{H}_2\text{O}$. In the above reaction, how many moles of electrons would be involved in the oxidation of $1\text{ mole}$ of reductant?

A

Two

B

Five

C

Ten

D

One

Question 32: Palette 32/40

DPT MCQ

8. In Redox reaction:
$\text{Fe} + \text{HNO}_3 \rightarrow \text{Fe(NO}_3\text{)}_2 + \text{NH}_4\text{NO}_3 + \text{H}_2\text{O}$
the coefficient of $\text{HNO}_3$, $\text{Fe(NO}_3\text{)}_2$, $\text{NH}_4\text{NO}_3$ is:

A

1 : 10 : 4

B

10 : 4 : 1

C

4 : 10 : 1

D

10 : 1 : 4

Question 33: Palette 33/40

DPT MCQ

9. Calculate the normality of a solution containing $13.4\text{ g}$ of sodium oxalate ($\text{Na}_2\text{C}_2\text{O}_4$) in $100\text{ mL}$ solution.

A

$1\text{ N}$

B

$2\text{ N}$

C

$0.5\text{ N}$

D

$4\text{ N}$

Question 34: Palette 34/40

DPT MCQ

10. What volume of $6\text{ M}$ $\text{HNO}_3$ is needed to oxidize $8\text{ g}$ $\text{Fe}^{2+}$ to $\text{Fe}^{3+}$, if $\text{HNO}_3$ gets converted to $\text{NO}$?

A

$8\text{ mL}$

B

$7.936\text{ mL}$

C

$32\text{ mL}$

D

$64\text{ mL}$

Question 35: Palette 35/40

DPT MCQ

11. Calculate the normality of a solution obtained by mixing $50\text{ mL}$ of $5\text{ M}$ solution of $\text{K}_2\text{Cr}_2\text{O}_7$ and $50\text{ mL}$ of $2\text{ M}$ solution of $\text{K}_2\text{Cr}_2\text{O}_7$ in acidic medium.

A

$21\text{ N}$

B

$15\text{ N}$

C

$42\text{ N}$

D

$10.5\text{ N}$

Question 36: Palette 36/40

DPT MCQ

12. What volume of $6\text{ M } \text{HCl}$ and $2\text{ M } \text{HCl}$ should be mixed to get $2\text{ litres}$ of $3\text{ M } \text{HCl}$?

A

$0.5\text{ L}$ of $6\text{ M } \text{HCl}$ and $1.5\text{ L}$ of $2\text{ M } \text{HCl}$

B

$1.0\text{ L}$ of $6\text{ M } \text{HCl}$ and $1.0\text{ L}$ of $2\text{ M } \text{HCl}$

C

$1.5\text{ L}$ of $6\text{ M } \text{HCl}$ and $0.5\text{ L}$ of $2\text{ M } \text{HCl}$

D

$0.8\text{ L}$ of $6\text{ M } \text{HCl}$ and $1.2\text{ L}$ of $2\text{ M } \text{HCl}$

Question 37: Palette 37/40

DPT MCQ

13. What weight of $\text{Na}_2\text{CO}_3$ of $85\%$ purity would be required to neutralize $45.6\text{ mL}$ of $0.235\text{ N } \text{H}_2\text{SO}_4$?

A

$0.668\text{ g}$

B

$0.568\text{ g}$

C

$0.483\text{ g}$

D

$0.785\text{ g}$

Question 38: Palette 38/40

DPT MCQ

14. In the reaction, $2\text{S}_2\text{O}_3^{2-} + \text{I}_2 \rightarrow \text{S}_4\text{O}_6^{2-} + 2\text{I}^-$, the equivalent weight of $\text{Na}_2\text{S}_2\text{O}_3$ is equal to:

A

$\text{Mol. wt.}$

B

$\frac{\text{Mol. wt.}}{2}$

C

$2 \times \text{Mol. wt.}$

D

$\frac{\text{Mol. wt.}}{6}$

Question 39: Palette 39/40

DPT MCQ

15. A sample of Pyrolusite ($\text{MnO}_2$) weighs $0.5\text{ g}$. To this sample, $0.594\text{ g}$ of $\text{As}_2\text{O}_3$ and dilute acid are added. After the reaction has ceased, the excess $\text{As}^{3+}$ is titrated with $45\text{ mL}$ of $\frac{\text{M}}{50}$ $\text{KMnO}_4$ solution. Calculate the percentage purity of $\text{MnO}_2$ in pyrolusite. (Molar mass of $\text{As}_2\text{O}_3 = 198\text{ g/mol}$, $\text{MnO}_2 = 87\text{ g/mol}$)

A

$65.25\%$

B

$87.00\%$

C

$43.50\%$

D

$52.20\%$

Question 40: Palette 40/40

DPT MCQ

16. The neutralization of a solution of $1.2\text{ g}$ of a mixture containing oxalic acid ($\text{H}_2\text{C}_2\text{O}_4 \cdot 2\text{H}_2\text{O}$), potassium hydrogen oxalate ($\text{KHC}_2\text{O}_4 \cdot \text{H}_2\text{O}$), and neutral impurities required $40.0\text{ mL}$ of $0.25\text{ N } \text{NaOH}$. On the other hand, titration of $0.4\text{ g}$ of the same mixture in acidic medium required $40.0\text{ mL}$ of $0.125\text{ N } \text{KMnO}_4$. Find the molar ratio of $\text{H}_2\text{C}_2\text{O}_4 \cdot 2\text{H}_2\text{O}$ to $\text{KHC}_2\text{O}_4 \cdot \text{H}_2\text{O}$ in the mixture.

A

1 : 2

B

2 : 1

C

1 : 1

D

3 : 2