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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. The pH of the solution of 5 x {tex}10^{-8}{/tex} M HCl at 25{tex} ^0{/tex}C is -

A

6.3

6.9

C

7.3

D

7.9

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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. What is pH of an acidic solution

A

Greather than 7

B

Equal to 7

Less than 7

D

Greater than 10

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Q 7. 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 8. 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 9. {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 10. pH of solution is zero. The nature of this solution is

acidic

B

basic

C

Neutral

D

amphoteric

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Q 11. Oxygen exhibits (-1) oxidation state

A

{tex}OF_2{/tex}

B

{tex}H_2O{/tex}

{tex}H_2O_2{/tex}

D

HClO

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Q 12. Nature of methyl orange is

A

Acidic

Basic

C

Neutral

D

None of these

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Q 13. When the pH of the environment of protein is changed it is said to be denatured. This is due to

Breakage of peptide bond

B

Breakage of disulfide links

C

Loss of tertiary structure

D

break down of regroups

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Q 14. What is aqua regia ?

A

1 : 2 mixture of chromic acid and sulphuric acid

B

1 : 3 Mixtureof conc. HCl and conc. {tex}HNO_3{/tex}

1 : 3 mixture of conc. {tex}HNO_3{/tex} and conc. HCl

D

1 : 1 mixture of conc. {tex}H_2SO_4 {/tex} and conc. HCl

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Q 15. Which gas is evolved when metal carbonates and bicarbonates react with acids ?

A

{tex}O_2{/tex}

{tex}CO_2{/tex}

C

{tex}H_2{/tex}

D

{tex}N_2{/tex}

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Q 16. {tex}H_3BO_3 {/tex} is

monobasic and weak lewis acid

B

monobasic and weak bronsted acid

C

monobasic acid and strong lewis acid

D

Tribasic and weak bronsted acid

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Q 17. In {tex}I_3^-{/tex} lewis base is

A

{tex}I_2{/tex}

B

{tex}I_2^+{/tex}

C

{tex}I_2^-{/tex}

{tex}I^-{/tex}

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Q 18. 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 19. The acid produced in our stomach is

A

Sulphuric acid

Hydrochloric acid

C

Acetic acid

D

Oxalic acid

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Q 20. The salt whose aqueous solution turns phenophthalein indicator pink is ?

A

KCl

B

{tex}K_2SO_4{/tex}

{tex}K_2CO_3{/tex}

D

{tex}KNO_3{/tex}

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Q 21. {tex}Ca(OH)_2 (s) + Cl_2 (g) \rightarrow ?{/tex}

A

{tex}Ca(OH)_2 + H_2O{/tex}

B

Slaked lime

{tex}CaOCl_2 + H_2O{/tex}

D

Gypsum

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Q 22. A Colorless gas B is produced when eggshell is treated with a solution. The gas B turns lime water milky. What are A and B?

A

A = NaCl & B = {tex}CO_2{/tex}

A = HCl & B = {tex}CO_2{/tex}

C

A = NaCl & B = {tex}Cl_2{/tex}

D

A = {tex}H_2SO_4{/tex} & B = {tex}O_2{/tex}

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Q 23. What is the chemical composition of plaster of pairs

A

{tex}CaSO_4.2H_2O{/tex}

B

{tex}CaSO_4.H_2O{/tex}

{tex}CaSO_4 \frac{1}{2} H_2O{/tex}

D

{tex}CaSO_4.3H_2O{/tex}

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Q 24. An element X reacts with dil {tex}H_2SO_4{/tex} as well as with NaOH to produce salt and {tex}H_2{/tex}(g) Hence it may be concluded that
(I) X is an electropositive element
(II) Oxide of X is basic in nature
(III) Oxide of X is acidic in nature
(IV) X is an electronegative element

I,II,III

B

IV,I,II

C

III,IV,I

D

I & II only

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Q 25. Which of the following is not the raw material for the manufacturing of baking soda?

A

Common salt

B

Ammonia

C

Lime stone

Slaked lime