Advertisements
Advertisements
प्रश्न
Explain the characteristics of ionic compounds.
Advertisements
उत्तर
- Physical nature: Ionic compounds are solids and are hard. They are generally brittle and break into pieces when pressure is applied.
- Melting and boiling points: Ionic compounds have high melting and boiling points.
- Solubility: Ionic compounds are generally soluble in water. However, they are insoluble in kerosene and petrol.
- Electrical conductivity: Ionic compounds conduct electricity in a molten state or in its aqueous solution. Conduction of electricity in these states is due to the movement of charged particles (i.e., ions) towards the oppositely charged electrodes. However, in solid-state, ionic compounds do not conduct electricity as movement of the ions is not possible due to their rigid structure.
संबंधित प्रश्न
Name the following:
Main ore of aluminium.
Name one metal which is extracted by reduction with heat alone.
Name the chemical compound which is electrolysed in molten state to obtain aluminium metal. Which gas is evolved during this process?
Name the metal which is extracted from haematite ore.
Explain how, mercury is extracted from its sulphide ore (cinnabar). Give equations of the reactions involved.
When an object made of metal A is kept in air for a considerable time, it loses its shine and becomes almost black due to the formation of a layer of substance B. When an object made of another metal C is kept in damp air for a considerable time, it gets covered with a green layer of substance D. Metal A is the best conductor of electricity whereas metal C is the next best conductor of electricity.
(a) What is metal A?
(b) What is metal C?
(c) Name the substance B.
(d) Name the substance D.
Give the principles of electromagnetic separation.
Give reasons, why aluminum is used in:
In making ships
Name the following:
The process of heating a substance very strongly in such a way that it does not combine with oxygen.
How an ore is concentrated by froth floatation process?
Complete the incomplete statement with missing words:
Metals are ______ while non-metals are ______ conductors of heat.
Iron is _______.
Sulphide ores : Roasting : : Carbonate ores : _______
Find the odd one out and give its explanation.
Bauxite reacts with sodium hydroxide in the Bayer’s process.
Explain the following reaction with the balanced equation.
Dry aluminium hydroxide is ignited at 1000 °C
Complete flow chart given below.

Explain in brief types of extraction of less reactive metals according to their reactivity.
Two ores A and B were taken. On heating ore A gives CO2 whereas, ore B gives SO2. What steps will you take to convert them into metals?
A mineral from which the metal can be extracted economically and conveniently is known as ______.
