Q. Which one of the following statements is not correct?
1) Biomass is a renewable source of energy
2) Gobar gas is produced when cowdung, crop residues, vegetable waste and sewage are allowed to decompose in the absence of oxygen
3) Biogas generation reduces soil and water pollution
4) Heating capacity of biogas is very low
Q. Chalk and marble are different forms of -
1) Calcium hydrogen carbonate
2) Calcium carbonate
3) Calcium acetate
4) Sodium carbonate
Q. The number of maximum electron in N Shell is -
1) 2
2) 8
3) 18
4) 32
Q. Vinegar is also known as -
1) ethanoic acid
2) nitric acid
3) sulphuric acid
4) tartaric acid
Q. Which of the following pairs is matched correctly?
I. Carbon dioxide-Green House Gas
II. Chloroflurocarbon-Ozone depletion substances
III. Oxides of nitrogen and sulphur-Fossil Fuels
IV. Nitrogen fixation-Bacteria
Correct code is -
1) Only I, II and III
2) Only II, III and IV
3) Only I, II and IV
4) I, II, III and IV all
Q. Which of the following statements is/ are correct?
1) Motor cars use petrol as fuel which is a mixture of alkenes
2) An alkene called ethane is used to prepare polythene which is used to make carry bags
3) An alkyne called ethyne (or acetylene) is used as a fuel in acetylene lamps.
4) All of the above
Q. Which of the following burns by producing a yellow, luminous flame?
1) Coal
2) LPG
3) Wax
4) Charocal
Q. Which of the following is termed as a fuel for the future?
1) Natural Gas
2) Shell Gas
3) Hydrogen
4) Alcohol
Q. The modern periodic table was prepared by -
1) Dobereiner
2) Newlands
3) Bohr
4) Mendeleev
Q. Which of the following is not a covalent compound?
1) Copper Sulphate
2) Methane
3) Water
4) Amonia
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