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Materials Metals and Non Metals

The metal which is used in wrapping the food materials is

a) Aluminum.
b) Silver.
c) Gold.
d) Copper.

✔Answer

✔Solution

Correct Answer Is : Aluminum.

Solution Is : Aluminium is used to wrap food materials because it is a cheap and light metal which is silvery white. It is too chemically reactive that it does not occur as such in nature.

The gas produced when metals react with sulphuric acid is

a) Oxygen.
b) Hydrogen.
c) Nitrogen.
d) Carbon dioxide.

✔Answer

✔Solution

Correct Answer Is : Hydrogen.

Solution Is : Metals being more reactive displaces hydrogen from sulphuric acid. They react with acids and produce hydrogen, which burns with a `pop` sound.

The element that catches fire if exposed to air is

a) Sulphur.
b) Phosphorous.
c) Sodium.
d) Silicon.

✔Answer

✔Solution

Correct Answer Is : Phosphorous.

Solution Is : Phosphorus is a very reactive non-metal. It catches fire if exposed to air. To prevent the contact of phosphorus with atmospheric oxygen, it is stored in water.

The gas, which produces a POP sound is

a) Oxygen.
b) Nitrogen.
c) Hydrogen.
d) Carbon dioxide.

✔Answer

✔Solution

Correct Answer Is : Hydrogen.

Solution Is : Hydrogen gas produces a POP sound as metals react with acids.

When metals react with sodium hydroxide they produce

a) Hydrogen.
b) Oxygen.
c) Nitrogen.
d) Water.

✔Answer

✔Solution

Correct Answer Is : Hydrogen.

Solution Is : Metals react with sodium hydroxide to produce hydrogen gas. Reactions of non-metals with bases are complex.

The nature of oxides of non-metals is

a) Acidic.
b) Basic.
c) Amphoteric.
d) Neutral.

✔Answer

✔Solution

Correct Answer Is : Acidic.

Solution Is : Oxides of non-metals are acidic in nature. They are also poor conductors and have low density.

The lightest metal is

a) Hydrogen.
b) Lithium.
c) Sodium.
d) Aluminium.

✔Answer

✔Solution

Correct Answer Is : Lithium.

Solution Is : Lithium is soft, silver-white and is the lightest metal which belongs to the alkali metal group of the periodic table.

The one that is stored in water is

a) Iron.
b) Zinc. .
c) Copper.
d) Phosphorus.

✔Answer

✔Solution

Correct Answer Is : Phosphorus.

Solution Is : Phosphorus is stored in water to prevent it from ignition, when it comes in the contact of air.

Sodium is kept in:

a) Acid
b) Base
c) Water
d) Kerosene

✔Answer

✔Solution

Correct Answer Is : Kerosene

Solution Is : It is highly reactive with water and oxygen.

The colour of copper sulphate solution is

a) Green.
b) Red.
c) Yellow.
d) Blue.

✔Answer

✔Solution

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Materials Metals and Non Metals

The metal which is used in wrapping the food materials is

Correct Answer Is : Aluminum.

Solution Is : Aluminium is used to wrap food materials because it is a cheap and light metal which is silvery white. It is too chemically reactive that it does not occur as such in nature.

The gas produced when metals react with sulphuric acid is

Correct Answer Is : Hydrogen.

Solution Is : Metals being more reactive displaces hydrogen from sulphuric acid. They react with acids and produce hydrogen, which burns with a `pop` sound.

The element that catches fire if exposed to air is

Correct Answer Is : Phosphorous.

Solution Is : Phosphorus is a very reactive non-metal. It catches fire if exposed to air. To prevent the contact of phosphorus with atmospheric oxygen, it is stored in water.

The gas, which produces a POP sound is

Correct Answer Is : Hydrogen.

Solution Is : Hydrogen gas produces a POP sound as metals react with acids.

When metals react with sodium hydroxide they produce

Correct Answer Is : Hydrogen.

Solution Is : Metals react with sodium hydroxide to produce hydrogen gas. Reactions of non-metals with bases are complex.

The nature of oxides of non-metals is

Correct Answer Is : Acidic.

Solution Is : Oxides of non-metals are acidic in nature. They are also poor conductors and have low density.

The lightest metal is

Correct Answer Is : Lithium.

Solution Is : Lithium is soft, silver-white and is the lightest metal which belongs to the alkali metal group of the periodic table.

The one that is stored in water is

Correct Answer Is : Phosphorus.

Solution Is : Phosphorus is stored in water to prevent it from ignition, when it comes in the contact of air.

Sodium is kept in:

Correct Answer Is : Kerosene

Solution Is : It is highly reactive with water and oxygen.

The colour of copper sulphate solution is

Correct Answer Is : Blue.

Solution Is : It is blue in clour, due to the presence of 5 molecules of water of crystallisation.

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