Q. How much percentage of oxygen is present in the atmosphere?
1) 39%
2) 79%
3) 10%
4) 21%
Q. Identify the correct chemical formula of chloroform -
1) CHCl3
2) CHCl
3) CHCl2
4) CH2Cl2
Q. Burning of coal is a _________ reaction.
1) displacement
2) decomposition
3) combination
4) double displacement
Q. Which one of the following was the first mineral acid discovered?
1) Sulphuric acid
2) Hydrochloric acid
3) Nitric acid
4) Phosphoric acid
Q. Which one of the following is the best example of desiccant?
1) Silica gel
2) Polystyrene
3) Sodium chloride
4) Sodium carbonate
Q. Which one of the following statements regarding bleaching powder and D.D.T. is correct?
1) Both are inorganic compounds
2) Both are organic compounds
3) Both contain chlorine
4) Both contain calcium
Q. The number of molecules of water of crystallization in copper Sulphate, Sodium carbonate, and gypsum is -
1) 5, 10, and 2 respectively
2) 10, 2, and 5 respectively
3) 5, 2, and 10 respectively
4) 2, 5, and 10 respectively
Q. At nearly 70°C, sodium bicarbonate shows the property of r&dually decomposing, which makes it sable in bakery products. The product T decomposition responsible for this use of sodium bicarbonate is -
1) Carbon dioxide
2) Hydrogen
3) Water vapour
4) Oxygen
Q. Which one of the following is the largest composition in biogas?
1) Carbon dioxide
2) Methane
3) Hydrogen
4) Hydrogen sulphide
Q. Which one of the following statements is NOT correct?
1) Biomass is a renewable source of energy
2) Gobar gas is produced when cow dung, crop residues, vegetable waste, and sewage are allowed to decompose in the absence of oxygen
3) Biogas generation reduces soil and water pollution
4) The heating capacity of biogas is very low
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