Write True (T) or False (F) against the following statements in the given brackets:
1. Acids corrode metals. ( )
2. Distilled water is a neutral substance. ( )
3. Sodium hydroxide turns blue litmus red. ( )
4. The stings of bees contain an acid. ( )
5. Milk of magnesia is used in antacids. ( )

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Solution

1. True

2. True

3. False
Blue litmus turns red only in acidic conditions. Sodium hydroxide is a base that turns red litmus blue.

4. True

5. True

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Question 13

State whether the following statements are true or false. Correct the false statements.
(a) All substances are either acidic or basic.
(b) A compound if acidic will turn all indicators red
(c) Lime water turns red litmus blue
(d) Common salt dissolved in water turns blue litmus red
(e) Phenolphthalein is a natural indicator
(f) Calamine can be used to treat ant’s sting
(g) Lemon water is basic in nature

State whether the following statements are true or false. Correct the false statements. [5 MARKS]
(a) All substances are either acidic or basic.
(b) A compound if acidic will turn all indicators red.
(c) Lime water turns red litmus blue.
(d) Common salt dissolved in water turns blue litmus red.
(e) Phenolphthalein is a natural indicator.

Mark ‘T’ if the statement is true and ‘F’ if it is false

(i) Nitric acid turn red litmus blue. (T/F)

(ii) Sodium hydroxide turns blue litmus red. (T/F)

(iii) Sodium hydroxide and hydrochloric acid neutralize each other and form salt and water. (T/F)

(iv) Indicator is a substance which shows different colours in acidic and basic solutions. (T/F)

(v) Tooth decay is caused by the presence of a base. (T/F)

A Drop of colourless liquid was placed on blue litmus paper. The litmus paper turned red. The liquid could be :
(1) dilute hydrochloric acid
(2) dilute sodium hydroxide solution
(3) distilled water
(4) sodium bicarbonate solution

Mark ‘T’ if the statement is true and ‘F’ if it is false:

(i) Nitric acid turns red litmus blue. (T/F)

(ii) Sodium hydroxide turns blue litmus red. (T/F)

(iii) Sodium hydroxide and hydrochloric acid neutralise each other and form salt and water. (T/F)

(iv) Indicator is a substance which shows different colours in acidic and basic solutions. (T/F)

(v) Tooth decay is caused by the presence of a base. (T/F)

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Write True (T) or False (F) against the following statements in the given brackets: 1. Acids corrode metals. ( ) 2. Distilled water is a neutral substance. ( ) 3. Sodium hydroxide turns blue litmus red. ( ) 4. The stings of bees contain an acid. ( ) 5. Milk of magnesia is used in antacids. ( )

1. True 2. True 3. False Blue litmus turns red only in acidic conditions. Sodium hydroxide is a base that turns red litmus blue. 4. True 5. True

Write True (T) or False (F) against the following statements in the given brackets:
1. Acids corrode metals. ( )
2. Distilled water is a neutral substance. ( )
3. Sodium hydroxide turns blue litmus red. ( )
4. The stings of bees contain an acid. ( )
5. Milk of magnesia is used in antacids. ( )

1. True

2. True

3. False
Blue litmus turns red only in acidic conditions. Sodium hydroxide is a base that turns red litmus blue.

4. True

5. True