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Standard IX

Chemistry

Preparation of Hydrogen from Cold Water and Metals

Question 14 ....

Question

Question 14.
Which of the following statements is correct about an aqueous solution of an acid and a base?
(i) Higher the pH, stronger the acid
(ii) Higher the pH, weaker the acid
(iii) Lower the pH, stronger the base
(iv) Lower the pH, weaker the base

Choose the correct option from the following:
(a) (i) and (iii)
(b) (ii) and (iii)
(c) (i) and (iv)
(d) (ii) and (iv)

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Solution

Higher the pH, stronger is the base and weaker the acid.
Lower the pH, stronger is the acid and weaker the base.
Hence, the correct answer is option (d).

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Q. An acid with a higher pH value is stronger than an acid with a lower pH value.

Q. Select the correct statement(s).

(I)

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(I I)

Polarisability of

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is higher than

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Question 16.
Which of the following phenomena occur, when a small amount of acid is added to water?
(i) Ionisation
(ii) Neutralisation
(iii) Dilution
(iv) Formation

Choose the correct option from the following:
(a) (i) and (ii)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (ii) and (iv)

p H

is a measure of the concentration of hydrogen ions in a solution. The lower the

p H

, the higher the concentration of hydrogen ions, and the more acidic a solution is. Alkaline or basic solutions have lower concentrations of hydrogen ions and a

p H

above

7

. Which of the following substances has the highest

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Preparation of Hydrogen from Cold Water and Metals

Standard IX Chemistry

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Higher the pH, stronger is the base and weaker the acid. Lower the pH, stronger is the acid and weaker the base. Hence, the correct answer is option (d).

Higher the pH, stronger is the base and weaker the acid.
Lower the pH, stronger is the acid and weaker the base.
Hence, the correct answer is option (d).