Q. Which of the following is a chemical change?
1) evaporation of water
2) burning of candle
3) glowing of an electric bulb
4) liquefaction of air
Q. Which of the following has the same atomic number and atomic weight?
1) hydrogen
2) helium
3) oxygen
4) nitrogen
Q. Which of the following has a pH less than 7?
1) blood
2) tears
3) pure water
4) saliva
Q. Which of the following gases is used in the cigarette lighters?
1) butane
2) methane
3) propane
4) radon
Q. which of the following gases is the most toxic?
1) Carbon dioxide
2) Carbon monoxide
3) Sulphur dioxide
4) Acetic acid
Q. Which of the following elements is found in all organic compounds?
1) Calcium
2) Carbon
3) Nitrogen
4) Oxygen
Q. Which of the following elements behave chemically.both as a metal and a non metal?
1) argon
2) carbon
3) xenon
4) boron
Q. What is the chemical name of bleaching Powder?
1) Calcium Carbonate
2) Calcium hydrochloride
3) calcium phosphate
4) Calcium cynamide
Q. What is commonly called limestone is
1) CaO
2) CaC2
3) CaSO4
4) CaCO3
Q. Until the nineteenth Century, aluminium was almost as expensive as gold. The invention of an inexpensive way to extract this metal by a 22-year-old American made this metal inexpensive subsequently. The inventor was
1) Goldschmidt
2) Mond
3) Charles-Martin Hall
4) Parkes
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