Q. The chemical behaviour of an atom depends upon
1) the number of protons in its nucleus
2) the number of neutrons in the nucleus
3) the number of electrons orbiting around the nucleus
4) the number of nucleons in the nucleus
Q. The gas that usually causes explosion in coal mines is
1) Hydrogen
2) Carbon monoxide
3) Air
4) Methane
Q. Identify the metal which is non toxic in nature
1) Chromium
2) Gold
3) Cadmium
4) Cobalt
Q. Iodine can be separated from a mixture of Iodine and Potassium Chloride by
1) Distillation
2) Filtration
3) Sedimentation
4) Sublimation
Q. Conduction band electrons have more mobility than holes because they are
1) lighter
2) experience collision less frequently
3) have negative charge
4) need less energy to move them
Q. The total energy of revolving electron in an atom
1) cannot be negative
2) can have any value above zero
3) can never be positive
4) will always be positive
Q. Vinegar is produced from
1) Ethanoic Acid
2) Valeric Acid
3) Methanoic Acid
4) Butanoic Acid
Q. The gas used for artificial ripening of green fruit is-
1) ethane
2) ethylene
3) carbon dioxide
4) oxytocin
Q. The substance used for artificial rain is -
1) Silver Bromide
2) Ammonium Nitrate
3) Silver Iodide
4) all the above
Q. Due to rusting the weight of iron
1) Increases
2) Decreases
3) Remains the same
4) Uncertain
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