Q. Which one among the following chemicals is used as washing soda?
1) Calcium carbonate
2) Calcium bicarbonate
3) Sodium carbonate
4) Sodium bicarbonate
Q. Which one of the following is a chemical change?
1) Cutting of hair
2) Graying of hair naturally
3) Swelling of resin in water
4) Cutting of fruit
Q. Why is potassium permanganate used for purifying drinking water ?
1) It kills germs
2) It dissolves the impurities
3) It is a reducing agent
4) It is an oxidizing agent
Q. Electron emission from a metallic surface by application of light is known as-
1) Thermionic emission
2) Photoelectric emission
3) High field emission
4) Auto-electronic emission
Q. Urea is-
1) A nitrogen containing organic compound
2) A nitrogen containing inorganic compound
3) A plant hormone
4) An Endergonic compound
Q. The stench due to leakage from LPG cylinder is because of-
1) Methane
2) Propane
3) Butane
4) Ethyl mercaptan
Q. Bhopal Gas Tragedy was caused due to the leakage of -
1) Methyl Isocynate
2) Nitrogen dioxide
3) sulphur dioxide
4) Carbon monoxide
Q. Which of the following is not a greenhouse gas?
1) Oxygen
2) Carbon dioxide
3) Chlorofluorocarbons
4) Methane
Q. Which of the following imparts deep blue color to glass?
1) Cobalt oxide
2) Cupric oxide
3) Ferric oxide
4) Nickel oxide
Q. Baking soda is -
1) Na2CO3
2) NaHCO3.6H20
3) NaHCO3
4) NaCO3.10H2O
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