Fill in the blanks with the help of words given in bracket after each sentence.

(a) While _ your teeth, leaving the _ running may waste several _ of water. (tap, litres, brushing, washing, drops)

(b) Water which looks clean still has disease carrying _and ___ impurities. (insects, microorganism, particles, dissolved, harmful).

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Question 2

In which of the following activities will you use the minimum amount of water?

(a) Bathing

(b) Brushing teeth

(d) Mopping a room

Fill in the blanks with suitable words :

An acid is a compound which when dissolved in water forms hydronium ions as the only ________ ions.

A base is a compound which is soluble in water contains ________ ions. A base reacts with an acid to form a ________ and water only. This type of reaction is known as ________

Fill in the blank:

(a) The insects, butterflies, honeybees and birds help flowering plants in _______.

(b) A forest is a purifier of _______ and ________.

(d) The decaying leaves and animal droppings in a forest enrich the _______.

Q. Choosing the correct words given in brackets, complete the sentences given below:
(i) An acid is a compound which, when dissolved in water gives ________ (hydronium/hydroxide) ions as the only _________ (positive/negative) ions.
(ii) A(n) _________ (acid/basic) salt is one in which the hydrogen of an acid has been partially replaced by a _________ (metal, non-metal).

Question 21
Fill in the blanks with the help of words given in bracket after each sentence.
(a) When air is contaminated by___ substances which have a ___ effect on both the ___ and ___, it is referred to as ___. (air pollution, harmful, living, unwanted, non-living, pollutants).
(b) Many ___ are responsible for causing ___ pollution. Petroleum ___ are a major source of ___ pollutants like ___ and ___. (sulphur dioxide, refineries, industries, nitrogen dioxide, gaseous, liquid, people, air).
(c) While ___ your teeth, leaving the ___ running may waste several ___ of water. (tap, litres, brushing, washing, drops)
(d) Water which is suitable for ___ is called ___ water. (washing, bathing, drinking, potable, soft).
(e) Water which looks clean still has disease carrying ___and ___ impurities. (insects, microorganism, particles, dissolved, harmful).

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