Q. Number of molecules of water of crystallization in copper sulphate, sodium carbonate and Gypsum are -
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. Which one of the following is the correct sequence of change in colours when a turmeric stain on white clothes is scrubbed by soap and then washed with water?
1) Yellow - pink - blue
2) Yellow - reddish brown - yellow
3) Yellow - reddish brown - blue
4) Yellow - blue - pink
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. Which one of the following is the best example of desiccant?
1) Silica gel
3) Sodium chloride
4) Sodium carbonate
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 -
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
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