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Class 10

Explore popular questions from Acids Bases and Salts for Class 10. This collection covers Acids Bases and Salts previous year Class 10 questions hand picked by experienced teachers.

Acids Bases and Salts

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Q 1. Nature of methyl orange is

A

Acidic

Basic

C

Neutral

D

None of these

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Q 2. One of the major environmental concerns is the phenomenon of acid rain. Rain water is an unpolluted atmosphere will be

Neutral

B

Slightly basic

C

Slightly acidic

D

Strongly acidic

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Q 3. In the reaction
{tex}HC_2O_4^- + PO_4^{3-} \rightleftharpoons HPO_4^{2-} + C_2O_4^{2-}{/tex}
Which are the two bronsted bases

A

{tex}HC_2O_4^- , PO_4^{3-}{/tex}

B

{tex}HPO_4^{2-}, C_2O_4^{2-}{/tex}

{tex}PO_4^{3-},C_2O_4^{2-}{/tex}

D

{tex}HC_2O_4^- , HPO_4^{2-}{/tex}

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Q 4. Ammonium ion ({tex}NH_4^+{/tex})is

a conjugate acid

B

a conjugate base

C

Neither an acid nor a base

D

both an acid and a base

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Q 5. The pH of a solution containing 0.1N NaOH solution

A

1

B

{tex}10^{-1}{/tex}

13

D

14

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Q 6. The following acids have been arranged in order to decrease acid strength. Identify the order
ClOH(1), BrOH(2), IOH(3)

1 > 2 > 3

B

2 > 1 > 3

C

3 > 2 > 1

D

1 > 3 > 2

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Q 7. The set with correct order of acidic is

{tex}HClO >HClO_2 >HClO_3 >HClO_4{/tex}

B

{tex}HClO_4 > HClO_3 >HClO_2 > HClO{/tex}

C

{tex}HClO > HClO_4 >HClO_3 > HClO_2{/tex}

D

{tex}HClO_4 > HClO_2 >HClO_3 > HClO{/tex}

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Q 8. {tex}H_2SO_4{/tex} is a

A

Monoprotic acid

B

Monobasic acid

Polyprotic acid

D

Both (A) & (B) are correct

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Q 9. Which of the following is not a lewis acid ?

CO

B

{tex}SiCl_4{/tex}

C

{tex}SO_3{/tex}

D

{tex}Zn^{2+}{/tex}

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Q 10. Which of the following acid is present in sour milk?

A

glycolic acid

lactic acid

C

citrus acid

D

tartaric acid

Explanation

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Q 11. An acid {tex} ( A ) {/tex} with sodium hydrogen carbonate is used in making the cakes fluffy and spongy. It is due to the release of {tex} ( B ) {/tex} gas in the reaction. Here, {tex} X {/tex} and {tex} Y {/tex} are

A

{tex} A: {/tex} Oxalic acid : {tex} B: \mathrm { CO } _ { 2 } {/tex}

B

{tex} A: {/tex} Tartaric acid {tex} : B: \mathrm { O } _ { 2 } {/tex}

C

{tex} A: {/tex} Succinic acid {tex} : B: \mathrm { H } _ { 2 } {/tex}

{tex} A: {/tex} Tartaric acid : {tex} B: \mathrm { CO } _ { 2 } {/tex}

Explanation

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Q 12. When {tex} \mathrm { CO } _ { 2 } {/tex} is passed through lime water, it turns milky. the milkiness in due to formation of

{tex} \mathrm { CaCO } _ { 3 } {/tex}

B

{tex} \mathrm { Ca } ( \mathrm { OH } ) _ { 2 } {/tex}

C

{tex} \mathrm { H } _ { 2 } \mathrm { O } {/tex}

D

{tex} \mathrm { CO } _ { 2 } {/tex}

Explanation

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Q 13. In one of the industrial processes used for manufacture
of sodium hydroxide, a gas {tex}\mathrm X {/tex} is formed as by-product. The gas {tex}\mathrm X {/tex} reacts with lime water to give a compound {tex}\mathrm Y {/tex} which is used as a bleaching agent in chemical industry. The compound {tex}\mathrm X {/tex} and {tex}\mathrm Y {/tex} could be

A

{tex} \mathrm { H } _ { 2 } {/tex} and {tex} \mathrm { NaHCO } _ { 3 } {/tex} respectively

B

{tex} \mathrm { CO } _ { 2 } {/tex} and {tex} \mathrm { CaOCl } _ { 2 } {/tex} respectively

{tex} \mathrm { Cl } _ { 2 } {/tex} and {tex} \mathrm { CaOCl } _ { 2 } {/tex} respectively

D

{tex} \mathrm { Cl } _ { 2 } {/tex} and {tex} \mathrm { NaHCO } _ { 3 } {/tex} respectively

Explanation

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Q 14. Plaster of pairs is made from-

A

lime stone

B

slaked lime

C

quick lime

gypsum

Explanation

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Q 15. On prolong supply of {tex} \mathrm { CO } _ { 2 } ( \mathrm { g } ) {/tex} in lime solution (lime- water), it is observed that

A

lime solution changes to gaseous state

the milkiness of lime water disappears

C

the milkiness of lime water changes from white to red.

D

the colour of lime water becomes black

Explanation

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Q 16. When {tex} \mathrm { Ca } ( \mathrm { OH } ) _ { 2 } {/tex} reacts with {tex} \mathrm { CO } _ { 2 } ( \mathrm { g } ) , {/tex} it will give {tex} \mathrm { CaCO } _ { 3 } ( \mathrm { s } ) {/tex} and {tex} \mathrm { H } _ { 2 } \mathrm { O } ( l ) . {/tex} The nature of {tex} \mathrm { CaCO } _ { 3 } {/tex} is

A

acidic

basic

C

neutral

D

All are possible

Explanation

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Q 17. The correct statement regarding universal indicator is

A

it is an indicator having {tex} \mathrm { pH } = 7 {/tex}

B

it gives blue colour at {tex} \mathrm { pH } = 3 {/tex}

C

it becomes colourless at {tex} \mathrm { pH } = 7 {/tex}

it gives orange colour at {tex} \mathrm { pH } = 3 {/tex}

Explanation

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Q 18. A blue litmus paper was first dipped in dil. {tex}\mathrm{HCl}{/tex} and then in dil. {tex}\mathrm{NaOH}{/tex} solution. It was observed that the colour of the litmus paper-

A

changed to red

changed first to red and then to blue

C

changed blue to colourless

D

remains blue in both the solutions

Explanation

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Q 19. Bleaching powder is soluble in cold water giving a milky solution due to-

A

available chlorine

lime present in it

C

calcium carbonate formation

D

The absorption of carbon dioxide from atmosphere

Explanation

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Q 20. Reaction of an acid with a base is known as-

A

decomposition

B

combination

C

redox reaction

neutralization

Explanation

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Q 21. Which of the following acid does not react with metals-

A

sulphuric acid

B

phosphoric acid

carbonic acid

D

nitric acid

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Q 22. Bleaching powder gives smell of chlorine because it-

A

is unstable

gives chlorine on exposure to atmosphere

C

is a mixture of chlorine and slaked lime

D

contains excess of chlorine

Explanation

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Q 23. Plaster of Paris hardens by-

A

giving of {tex} \mathrm { CO } _ { 2 } {/tex}

B

changing into {tex} \mathrm { CaCO } _ { 3 } {/tex}

combining with water

D

giving out water

Explanation

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Q 24. Aqueous solution of copper sulphate reacts with aqueous ammonium hydroxide solution to give.

A

brown precipitate

pale blue precipitate

C

white precipitate

D

green precipitate

Explanation

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Q 25. The {tex} \mathrm { pH } {/tex} of a solution is {tex} 5.0 . {/tex} Its hydrogen ion concentration is decreased by {tex}100{/tex} times, the solution will be:

A

more acidic

B

basic

neutral

D

unaffected

Explanation