Give answer for the following:
(i) Metal liquid at room temperature.
(ii) Non-metal that is a conductor of electricity.
(iii) Netural oxide.
(iv) Metallic oxide that cannot be reduced by hydrogen.
(v) Non-metal that has luster.

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Solution

(i) Mercury is a metal that exists as a liquid at room temperature.
(ii) Graphite is a non-metal that is a conductor of electricity due to its high melting point.
(iii) Carbon monoxide $(CO)$ is a neutral oxide that shows neither acidic nor basic properties.
(iv) The oxides of highly reactive metals by reactivity series cannot be reduced by hydrogen such as potassium oxides $(K_{2} O)$ . Reactivity series orders the metals by the most reactive placed at the top and least reactive metals at the bottom.
(v) Graphite is a non-metal that has a luster.

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Name:

(a) two metals which are liquid at room temperature,

(b) metal which do not corrode easily

(d) a non-metal which is lustrous,

(e) a non-metal which conducts electricity,

(f) a metal which is brittle,

(g) two elements which are monoatomic,

(h) two metallic oxides which are acidic,

(i) two metallic oxides which are amphoteric,

(j) two metallic which react with cold water,

(k) the compound responsible for green deposit on the surface of copper,

(l) a non-metal which can form a positive ion,

(m) a non-metal which shows reducing property,

(n) a metal whose oxide is reduced only by carbon.

Name a non-metal that has a metallic luster and sublimes on heating.

give one example of each:

a) an acidic oxide

b) a basic oxide

c) an amphoteric oxide

d) a neutral oxide

e) a metal and non-metal which are in liquid state at room temperature.

f) an element stored in kerosene.

g) a soft metal that can be cut through knife.

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