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Class 10

Explore popular questions from Chemical Reactions and Equations for Class 10. This collection covers Chemical Reactions and Equations previous year Class 10 questions hand picked by experienced teachers.

Chemical Reactions and Equations

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Q 1. Which of the statements about the reaction below are incorrect?
2PbO (s) + C(s) {tex}\rightarrow {/tex} 2Pb (s) + CO{tex}_2{/tex} (g)
(i) Lead is getting reduced
(ii) Carbon dioxide is getting oxidized
(iii) Carbon is getting oxidized
(iv) Lead oxide is getting reduced

(i) and (ii)

B

(i) and (iii)

C

(i), (ii) and (iii)

D

All

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Q 2. {tex}\mathrm{Fe_2}{/tex}{tex}\mathrm{O_3}{/tex} + {tex}\mathrm{2Al}{/tex} {tex}\rightarrow {/tex} {tex}\mathrm{Al_2}{/tex}{tex}\mathrm{O_3}{/tex} +{tex} \mathrm{2Fe} {/tex}
The above reaction is an example of a

A

combination reaction

B

double displacement reaction

C

decomposition reaction

displacement reaction

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Q 3. What happens when dilute hydrochloric acid is added to iron fillings? Tick the correct answer.

Hydrogen gas and iron chloride are produced

B

Chlorine gas and iron hydroxide are produced

C

No reaction takes place

D

Iron salt and water are produced

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Q 4. A reaction in which, under equilibrium conditions, both the reactants and products are present is called

reversible

B

Irreversible

C

endothermic

D

exothermic

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Q 5. The reaction, {tex}H_2{/tex} + {tex}Cl_2{/tex} {tex}\rightarrow{/tex} {tex}2HCl{/tex} is,

A

an oxidation reaction

B

a reduction reaction

a combination reaction

D

an isomoerisation reaction

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Q 6. When sodium metal is dropped into water, it gets

oxidized

B

reduced

C

remain unchanged

D

hydrolyzed

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Q 7. Fatty foods become rancid because of which one of the following?

Oxidation

B

Reduction

C

Hydrogenation

D

Corrosion

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Q 8. Which one of the following reactions is an example of thermal decomposition?

{tex}CaCO_3 (s) {/tex} {tex}\rightarrow{/tex}{tex}CaO (s) {/tex}+ {tex}CO_2 (g){/tex}

B

{tex}2HOCl (aq) {tex}\rightarrow{/tex} {tex}O_2 (g){/tex} + {tex}HCl (g){/tex}

C

{tex}2AgCl (I) {tex}\rightarrow{/tex} {tex}2Ag (s) (g) {/tex}+ {tex}Cl_2(g){/tex}

D

{tex}2H_2O (l){/tex} {tex}\rightarrow{/tex} {tex}2H_2 (g){/tex} + {tex}O_2 (g){/tex}

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Q 9. In the reaction {tex}2Al {/tex}+ {tex}{Fe_2}{/tex}{tex}O_3{/tex} {tex}\rightarrow{/tex} {tex}Al_2{/tex}{tex}O_3{/tex} + {tex}2Fe{/tex} which one is oxidized?

{tex}Al{/tex}

B

{tex}Fe{/tex}

C

{tex}Fe_2{/tex}{tex}O_3{/tex}

D

none

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Q 10. Oily and fatty food items are flushed with nitrogen gas because of which one of the following reasons?

A

Nitrogen reacts with oils and fats and thus prevents oxidation

Nitrogen is inert and excludes a direct contact of air with oily and fatty food items

C

Nitrogen helps in the decomposition of food items and makes them tasty

D

The given statements is wrong

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Q 11. Which one of the following is used in the white washing of walls?

Calcium oxide mixed with water

B

Calcium carbonate mixed with water

C

Calcium sulphate mixed with water

D

Sodium chloride mixed with water

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Q 12. Dissolving sugar in water is an example of:

Physical change

B

Chemical change

C

Redox reaction

D

None of these

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Q 13. Heat is evolved during:

A

Endothermic reaction

B

Displacement reaction

Combustion reaction

D

Combination reaction

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Q 14. In an electroytic cell where electrolysis is carried, anode has:

Positive charge

B

Negative charge

C

Connected to negative terminal of the battery

D

None of these is correct

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Q 15. A change is said to be a chemical change when:

A

energy change occurs

new substances are formed

C

the change cannot be easily reversed

D

all statements are correct

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Q 16. Copper displaces which of the following metals from its salt solution:

A

ZnSO{tex}_4{/tex}

B

FeSO{tex}_4{/tex}

AgNO{tex}_3{/tex}

D

NiSO{tex}_4{/tex}

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Q 17. Which of the following is an example of displacement reaction?

A

2KClO{tex}_3{/tex} {tex}\rightarrow{/tex} 2KCl + 3O{tex}_2{/tex}

B

2H{tex}_2{/tex} + O{tex}_2{/tex} {tex}\rightarrow{/tex} 2H{tex}_2{/tex}O

Zn + 2HCl {tex}\rightarrow{/tex} ZnCl{tex}_2{/tex} + H{tex}_2{/tex}

D

N{tex}_2{/tex} + 3H{tex}_2{/tex} {tex}\rightarrow{/tex} 2NH{tex}_3{/tex}

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Q 18. A redox reaction is one in which :

A

both the substances are reduced

B

both are the substances are oxidised

C

an acid is neutraliesd by the base

one substance is oxidised while the other is reduced

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Q 19. {tex}\mathrm{Assertion} :{/tex} In HClO{tex}_3{/tex} oxidation number of Cl is -1.
{tex}\mathrm{Reason}:{/tex} Oxygen is more electropositive than fluorine.

A

Both Assertion and Reason are true and Reason is the correct explanation of 'Assertion'

B

Both Assertion and Reason are true and Reason is not the correct explanation of 'Assertion'

C

Assertion is true but Reason is false

Assertion is false but Reason is true

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Q 20. {tex}\mathrm{Assertion}:{/tex} Oxidation state of carbon in its compounds is some time +4.
{tex}\mathrm{Reason}:{/tex} An element has a fixed oxidation state.

A

Both Assertion and Reason are true and Reason is the correct explanation of 'Assertion'

B

Both Assertion and Reason are true and Reason is not the correct explanation of 'Assertion'

Assertion is true but Reason is false

D

Assertion is false but Reason is true

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Q 21. Mathe the following:

Column I Column II
(A){tex} XeF_4{/tex} (P) -3
(B){tex}NH_4^+{/tex} (Q) +4
(C){tex}XeO_2F_2{/tex} (R) +5
(D){tex}Na_3PO_4{/tex} (S)+6

A - P

B

B - Q

C

C - R

D

D - S

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Q 22. In the reaction, H{tex}_2{/tex}S + Cl{tex}_2{/tex} {tex}\rightarrow{/tex} 2HCl + S, the electrons are transfered from

A

S{tex}^{2-}{/tex} to S

B

Cl{tex}_2{/tex} to HCl

S{tex}^{2-}{/tex} to Cl{tex}_2{/tex}

D

H{tex}_2{/tex}S to S

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Q 23. Which one of the following is not double displacement reaction?

A

Pb (NO{tex}_3{/tex}){tex}_2{/tex} (aq) + 2Kl (aq) {tex}\rightarrow{/tex} PbI{tex}_2{/tex} (s) + 2KNO{tex}_3{/tex} (aq)

B

CuSO{tex}_4{/tex} (aq) + H{tex}_2{/tex}S (aq) {tex}\rightarrow{/tex} CuS (s) + H{tex}_2{/tex}SO{tex}_4{/tex} (aq)

C

Na{tex}_2{/tex}CO{tex}_3{/tex} (s) + 2HCl (aq) {tex}\rightarrow{/tex} 2NaCl (aq) + H{tex}_2{/tex}CO{tex}_3{/tex} (aq)

CaO (s) + CO{tex}_2{/tex} (g) {tex}\rightarrow{/tex} CaCO{tex}_3{/tex} (s)

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Q 24. Which one of the following reactions is an example of photo decomposition?

A

CaCO{tex}_3{/tex} (s) {tex}\rightarrow{/tex} CaO (s) + CO{tex}_2{/tex} (g)

B

NH{tex}_4 {/tex}Cl (s) {tex}\rightarrow{/tex} NH{tex}_3{/tex} (g) + HCl (g)

C

2H{tex}_2{/tex}O (I) {tex}\rightarrow{/tex} 2H{tex}_2{/tex} (g) + O{tex}_2{/tex} (g)

2AgCl (s) {tex}\rightarrow{/tex} 2Ag (s) + Cl{tex}_2{/tex} (g)

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Q 25. Which one of the following reactions is an example of electrical decomposition?

A

CaCO{tex}_3{/tex} (s) {tex}\rightarrow{/tex} CaO (s) + CO{tex}_2{/tex} (g)

B

2HOCl (aq) {tex}\rightarrow{/tex} O{tex}_2{/tex} (g) + HCl (g)

2H{tex}_2{/tex}O (I) {tex}\rightarrow{/tex} 2H{tex}_2{/tex} (g) + O{tex}_2{/tex} (g)

D

2AgCl (s) {tex}\rightarrow{/tex} 2Ag (s) + Cl{tex}_2{/tex} (g)