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Kidneys

Write True T ...

Question

Write True (T) or False (F):
1. Nutrition in paramecium takes place through pseudopodia. ( )
2. Egestion means removing undigested food from the body in the form of faeces. ( )
3. Sulphuric acid is a hydrating acid. ( )
4. Mercury sticks to the wall of the thermometer.
5. Indicators are substances which show a change in colour when brought in contact with acids and bases.

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Solution

1. (F)
Nutrition in paramecium takes place through cilia, with the help of which it ingests food.

2. (T)

3. (T)

4. (F)
Mercury does not stick to the walls of a thermometer.

5. (T)

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Q. Write T for the true statement and F for the false one. Correct the false statement(s).

1. Hydrochloric acid, nitric acid, and sulphuric acid are called organic acids.
2. Acids are bitter to taste.
3. The chemical name of washing soda is sodium bicarbonate.
4. When you use litmus as an indicator, it gives the colour red for bases.
5. A salt is formed by the neutralization of an acid with water.

Q. The following flow diagram shows the main steps for the manufacture of sulphuric acid by the Contact Process.

(a) Name a substance other than sulphur that would react with dry air on heating to form sulphur dioxide.
(b) Write the equation for the reaction taking place in the catalytic converter.
(c) The sulphur trioxide is absorbed in

98 %

sulphuric acid and not in water. Give a reason for this and write the equation taking place here.
(d) What is added to change oleum into sulphuric acid?
[5 MARKS]

Olfactory indicators respond to acid or base by change in smell.

Say True or False.

Q. A substance that changes color in response to a chemical change is called as indicator . and Name of the indicator used when sodium hydroxide is titrated against sulphuric acid is phenolpthalein .
For true add 0 and for false add 1.

Q. Consider the following statements :

(A) Both acids and bases change the colour of all indicators.
(B) If an indicator gives a colour change with an acid, it does not give a change with a base.
(C) If an indicator changes colour with a base, it does not change colour with an acid.
(D) Change of colour in an acid and a base depends on the type of the indicator.

Which of these statements are correct?

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