Q. The main constituent of vinegar is
1) Citric acid
2) Ascorbic acid
3) Acetic acid
4) Tartaric acid
Q. The elements of a group in the periodic table-
1) are isobars
2) have consecutive atomic numbers
3) have similar chemical properties
4) are isotopes
Q. The pH of fresh groundwater slightly decreases upon exposure to air because -
1) carbon dioxide from air is dissolved in the water
2) oxygen from air is dissolved in the water
3) the dissolved oxygen of the groundwater escapes into air
4) the dissolved carbon dioxide of the groundwater escapes into air
Q. Which one among the following nontoxic gases helps in formation of enzymes which ripen fruit?
1) Methane
2) Acetylene
3) Ethane
4) Carbon dioxide
Q. Age of fossil may be found out by determining the ratio of two isotopes of carbon. The isotopes are -
1) C-12 and C-13
2) C-13 and C-14
3) C-12 and C-14
4) C-12 and carbon black
Q. Which one among the following statements is correct?
1) All bases are alkalis
2) None of the bases is alkali
3) There are no more bases except the alkalis
4) All alkalis are bases but all bases are not alkalis
Q. Which one of the following reactions is the main cause of the energy radiation from the Sun?
1) Diffusion reaction
2) Chemical reaction
3) Fission reaction
4) Fusion reaction
Q. Which was mainly responsible for the Bhopal Mishap in 1984?
1) Methyl Isocyanate
2) Carbon dioxide
3) Amonia
4) Carbon mono-oxide
Q. The product used for manufacturing of Industrial alcohol is
1) Bagasse
2) Paper-pulp
3) Molasses
4) Khandasari
Q. Bleaching powder is used in drinking water as a/an
1) antibiotic
2) disinfectant
3) antiseptic
4) coagulant
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