Q. All the following are examples of chemical change,expect
1) magnetising of iron nail
2) rusting of iron rod
3) digestion of food
4) souring of milk
Q. All noble gases are
1) colourless
2) colourless
3) colourless and odourless
4) light blue
Q. Alkali metals belong to the
1) s-block
2) p-block
3) d-block
4) f-block
Q. Alcohol Contains
1) nitrogen, hydrogen, oxygen
2) carbon, hydrogen, oxygen
3) oxygen, carbon, nitrogen
4) hydrogen, chlorine, oxygen
Q. Air is a/an
1) element
2) compound
3) mixture
4) colloid
Q. Absolute alcohol is
1) 100% proof
2) 95% alcohol and 5% water
3) 200% proof
4) rectified spirit
Q. A ß particle has
1) unit positive Charge
2) unit negative charge
3) no charge
4) two unit positive charge
Q. A single covalent bond
1) is formed by the transfer of 2 electrons
2) exists between hydrogen and chlorine in an aqueous solution, of hydrochloric acid
3) is longer than a double bond
4) does not require energy to disrupt it unlike an ionic bond
Q. A deficiency of this mineral can cause stretch marks in our skin; this mineral is
1) Zinc
2) Iron
3) Sodium
4) Magnesium
Q. A chemical used in photography is
1) sodium sulphate
2) sodium sulphite
3) sodium oxalate
4) sodium thiosulphate
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