Question 22
Indicate whether the following statements are true or false. Also write the false statements in their correct form.
(a) Air is necessary for combustion.
(b) Magnesium is a non-combustible metal.
(c) Carbon dioxide is an excellent fire extinguisher.
(d) Calorific value of wood is higher than that of coal

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Solution

(a) The statement is true.
Air is necessary for combustion.

(b) The statement is false.
Magnesium is a combustible metal.

(c) The statement is true.
Carbon dioxide is an excellent fire extinguisher.
(d) The statement is false.
Calorific value of coal is higher than that of wood.

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Similar questions

Q. Indicate whether the following statements are True or False. Also, write the false statements in their correct form.
(a) Air is necessary for combustion.
(b) Magnesium is a non-combustible metal.
(c) Carbon dioxide is an excellent fire extinguisher.
(d) Calorific value of wood is higher than that of coal.

Q. Question 28
Write True/False against the following statements and also correct the false statement.
(a) A physical process in which a substance reacts with oxygen to give off heat is called combustion
(b) Water is the best extinguisher for fires involving electrical equipment
(c) Alcohol, CNG and LPG are inflammable substances.
(d) Increased concentration of nitrogen in air is believed to cause global warming.
(e) Greater the calorific value, better is the fuel
(f) Middle zone is the hottest zone of a flame.
(g) The substances which vapourise during burning, give the flame

Which of the following statement is not correct about carbon dioxide acting as a fire extinguisher for electrical fires ?

(a) it is heavier than air

(b) it is lighter than air

(d) it does not support combustion

Question 04(vii)
Indicate whether the following statements are True (T) or False (F).
Fertilization is necessary even in asexual reproduction. ( )

Q. Question 2(a)
State whether the following statements are true or false. In case a statement is false, write the corrected statement in your notebook.
Cutting a log of wood into pieces is a chemical change.

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(a) The statement is true. Air is necessary for combustion. (b) The statement is false. Magnesium is a combustible metal. (c) The statement is true. Carbon dioxide is an excellent fire extinguisher. (d) The statement is false. Calorific value of coal is higher than that of wood.

(a) The statement is true.
Air is necessary for combustion.

(b) The statement is false.
Magnesium is a combustible metal.

(c) The statement is true.
Carbon dioxide is an excellent fire extinguisher.
(d) The statement is false.
Calorific value of coal is higher than that of wood.