Combustion And ...

Directions: Read the statements given below and select the correct option.

Statement 1: Combustion is a chemical process in which a substance reacts with oxygen to give out heat and light.
Statement 2: Heat and light are produced in the sun due to combustion.

Which of the following options correctly defines calorific value of a fuel?

What are the most suitable temperature and pressure conditions for the formation of petroleum?

Which of the following is a fossil fuel?

Which of the following are used these days to make the head of a matchstick?

a. Antimony trisulphide
b. Potassium chlorate
c. Red phosphorus
d. White phosphorus

Which instrument is fitted in automobiles to reduce the harmful emissions from its exhaust?

Which of the following, when buried under the earth for a long period, give(s) rise to petroleum?

Liquefied petroleum gas consists mainly of

Which of the following pairs is incorrectly matched?

Observe the image given below and answer the question that follows.



Which of the following in an incorrect statement?

Analyse the two statements given below and select the correct option.

Statement I: Fuel are energy reserves and this energy is released by the process of combustion.
Statement II: Combustion is the process of burning the substance in the presence of a sufficient quantity of oxygen.

Observe the activity in the image below and answer the question that follows.



Which of the following statements are incorrect?

I. Burning of the magnesium ribbon is a combustion reaction.
II. Magnesium combines with oxygen.
III. The reaction is exothermic.
IV. The ribbon is held in the flame to initiate the reaction.

Which of the following is not a constituent of petroleum?

Observe the given flow chart and the statements that follow.



I. W and X are the components of water gas.
II. W, X and Y are the components of coal gas.
III. W is a rocket fuel.
IV. Z is a domestic fuel.

Which of the following options is the correct identification of W, X, Y and Z?

Which of the following options regarding burning of coal is correct?