Question

Fill in the following blanks with suitable words:
(a) Metals are……………. conductors of heat and……………...
(b) Most non-metals are……………. conductors of heat and electricity.
(c) Phosphorous is a very……………. Non-metal.
(d) Metals react with acids to produce………... gas.
(e) Iron is more…………. than copper.
(f) Metals form……...oxides whereas non-metals form………oxide.
(g) Sulphur forms………oxide whereas magnesium forms…………...oxide.
(h) A non-metal is used to make an antiseptic solution called tincture…………...

Answer 1

Explanation:

1. good conductors of electricity and heat
2. bad
3. reactive
4. hydrogen
5. harder
6. basic,acidic
7. acidic,basic
8. iodine

Answer 2

Fill in the following blanks with suitable words:

(a) Metals are good conductors of heat and electricity.

(b) Most non-metals are poor conductors of heat and electricity.

(c) Phosphorous is a very reactive Non-metal.

(d) Metals react with acids to produce hydrogen gas.

(e) Iron is more reactive than copper.

(f) Metals form basic oxides whereas non-metals form acidic oxide.

(g) Sulphur forms acidic oxide whereas magnesium forms basic oxide.

(h) A non-metal is used to make an antiseptic solution called tincture iodine.

Explanation:

• Metals allow movement of electrons, the conductivity of metals depends on the nature of the material.
• Gases are loosely bounded with each other. But, gas can conduct electricity at low pressure and high voltage under certain conditions.
• Phosphorus is never found as pure element from earth's crust and it has many colours.
• When metal and acids reacts, the hydrogen ions of acids are segregated and liberated as hydrogen gas.
• Electronic configuration of an element determines the reactivity of an element.
• When metal reacts with water, there is formation of hydroxide which is basic in nature. When metal reacts with water, there is formation of hydrogen ions which forms acids.
• Sulphur forms sulphuric acid and magnesium forms magnesium hydroxide.
• Iodine is used to sanitise the infected area.