Question

I) Choose the correct option:
1. Which of these metals cannot displace hydrogen from a dilute acid?
(a) Zn (b) Na (c) Au (d) Al
2. Non-metals react with oxygen to form:-
(a) Acidic oxide (b) Basic oxide
(c) There is no reaction (d) Both acidic and basic oxide
3. A dull green coating on a copper vessel when it is exposed to moist air is
due to:-
(a) Copper hydroxide (b) Copper carbonate
(c) Both of these (d) None of these
4. Solder is an alloy of:-
(a) Lead and tin (b) Lead and zinc
(c) Copper and tin (d) Copper and zinc
5. Which of these is not a greenhouse gas:-
(a) C02 (b) SO2
(c) CH4 (d) N2
6. Gold normally occurs in nature:-
(a) In free state (b) In combined state
(c) As sulphate ore (d) None of these
7. Which of these can cause acid rain:-
(a) CO (b) CO2
(c) SO2 (d) N2
II) True or false
1. Conduction of electricity in liquids occurs through electrons.
2. Aluminium does not react with water.
3. Interaction of charges is called electricity.
4. Spontaneous combustion starts at room temperature.
5. Non metals don't react with dilute acids.
6. Conventional current flows from positive to negative terminal.
7. Metals generally have high specific gravity.

Answer 1

Answer:

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