(English Medium) ICSE Class 10 - CISCE Question Bank Solutions for Chemistry

What do you understand by dipole (polar) molecule? 

State the type of bond formed when the combining atom has zero E.N. difference. 

State the type of bond formed when the combining atom has small E.N. difference.

State the type of bond formed, and draw Lewis structure of water.

Explain the following:

Water is a polar covalent molecule.

Element A has 2 electrons in its M shell. Element B has atomic number 7.

Write equations to show how A and B form ions.

Element A has 2 electrons in its M shell. Element B has atomic number 7.

If B is a diatomic gas, write the equation for the direct combination of A and B to form a compound.

Element A has 2 electrons in its M shell. Element B has atomic number 7.

If the compound formed between A and B is melted and an electric current is passed through the molten compound, the element A will be obtained at the ______ and B at the ______ of the electrolytic cell.

Draw the electron dot structure of covalent compound methane (non polar) and HCL (polar) and give two difference between them.

Name two compounds that are covalent when taken pure but produce ions when dissolved in water.

What is the difference between :

Ionic compounds and covalent compounds

What is the difference between a polar covalent compound and a non-polar covalent compound?

Potassium (Atomic No. 19) and chlorine (Atomic No. 17) react to form a compound. On the basis of electronic concept, explain

(i) oxidation

(ii) reduction

(iii)oxidising agent

(iv)reducing agent

Explain the following: 

Polar covalent compounds conduct electricity?

Explain the following:

Lead carbonate does not react with dilute HCl.

Choosing only substances from the list given in the box below, write equations for the reactions which you would use in the laboratory to obtain: Sodium sulphate

(a) What are the terms defined by the following?

(i) A salt containing a metal ion surrounded by other ions or molecules.

(ii) A base which is soluble in water.

(b) Making use only of substances chosen from those given below:

Dilute sulphuric acidSodium Carbonate

Zinc   Sodium sulphite

Lead  Calcium carbonate

Give equations for the reactions by which you could obtain :

(i) Hydrogen

(ii) Sulphur dioxide

(iii) Carbon dioxide

(iv) Zinc carbonate (two steps required)

Write balanced equation for a coloured metallic oxide which dissolves in alkalis to yield colourless solutions.

What do you understand by amphoteric oxide?

Give the balanced equations for the reaction with two different amphoteric oxides with a caustic alkali.