Q15 of 53 Page 61

Calcium phosphate is present in tooth enamel. Its nature is:

Calcium phosphate which is present in tooth enamel is basic in nature because the acid produced by the bacteria in our mouth easily corrodes it.

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13

Which of the following statements is correct about an aqueous solution of an acid and of 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

 14

Sodium carbonate is a basic salt because it is a salt of:

 16

A sample of soil is mixed with water and allowed to settle. The clear supernatant solution turns the pH paper yellowish-orange. Which of the following would change the colour of this pH paper to greenish-blue?

 17

Which of the following gives the correct increasing order to acidic strength?