Question

(d) Calories
B.
5. The standard unit of calorific value is
(a) kJ/cm
(b) Jh/g
(c) kJ/kg
State whether the following statements are true or false :
1. Combustion always produces heat.
2. Burning of LPG is a slow combustion.
3. The higher the ignition temperature, more inflammable is the substance.
Combustion is a reversible reaction.
5. An example of spontaneous reaction is burning of white phosphorous.
Match the following:
Column A
Column B
4
C.
1. Ignition temperature
2. Yellow flame
3. Wood
(a) Partial combustion
(b) Fire extinguisher
(c) Incomplete combustion
(d) Non-luminous
(e) Acid rain
(f) Inflammable substances
4. Compounds of sulphur
5. Carbon dioxide
ient air​

Answer 1

Answer:

5. Option C) kJ/kg

State whether true/false:

1.False

False2.False

False2.False4. False

False2.False4. False5.True

Explanation:

State true/false explanation:

1. Combustion reactions are always exothermic(give off heat).

2. Burning of LPG is an e.g.. of rapid combustion.

4. Combustion is irreversible.