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.
Which of the following pairs will give displacement reactions?
Which metal becomes black in the presence of hydrogen sulphide gas in air?
Fill in the following blank with suitable word:
Bronze is an alloy of copper and .........
Name the metal which is extracted from haematite ore.
Name one ore of aluminium. Name the aluminium compound present in this ore and write its chemical formula.
Explain how, mercury is extracted from its sulphide ore (cinnabar). Give equations of the reactions involved.
Which of the following pair of metals exists in their native state in nature?
(a) Ag and Hg
(b) Ag and Zn
(c) Au and Hg
(d) Au and Ag
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.
Write equations for each of the above metal which reacts with water.
The following questions relate to the extraction of aluminium by electrolysis.
Explain why it is necessary to renew the anode periodically.
X is an element in the form of a powder. X burns in oxygen and the product is soluble in water. The solution is tested with litmus. Write down only the word which will correctly complete each of the following sentences:
(a) If X is a metal, then the litmus will turn ______.
(b) If X is a non-metal, then the litmus will turn ______.
(c) If X is a reactive metal, then ______ will be evolved, when X reacts with dilute sulphuric acid.
(d) If X is a non -metal, it will form _ oxide, which will form ______ solution with water.
(e) If X is a non -metal, it will not conduct electricity unless it is carbon in the form of ______.
Which one of the following is not true of metal :
Metals form non-polar covalent compounds
Zinc blende is converted to oxide by ______ process.
_______ is the least reactive metal.
Explain the following reaction with the balanced equation.
Zinc oxide is treated with carbon
Complete flow chart given below.
The poorest conductor of heat among metals is ____________.
2 mL each of concentrated HCl, HNO3 and a mixture of concentrated HCl and concentrated HNO3 in the ratio of 3 : 1 were taken in test tubes labelled as A, B and C. A small piece of metal was put in each test tube. No change occurred in test tubes A and B but the metal got dissolved in test tube C respectively. The metal could be
