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

What type of bond is formed between two atoms, when the electronegative difference between them is zero?

Separate the following compounds into three categories - ionic, polar and covalent compounds; N₂, NH₄Cl, NH₃, NO, NH₄NO₃, NCl₃.

Fill in the blanks.
The electrovalent bond or ionic bond is called as _____ bond

Fill in the blank.
___________ single covalent bonds are formed between the carbon and chlorine atoms.

Element X is a metal with a valency 2. Element Y is a non metal with a valency 3.
(a) Write equations to show how X and Y form ions.
(b) If Y is a diatomic gas, write the equation for the direct combination of X and Y to form a compound.

Match the column A with Column B.

Among the following compounds identify the compound that has all three bonds (ionic, covalent and coordinate bond).

A Compound 'X' consists of only molecules. Hence 'X' will have

Element X is a metal with a valency 2; Y is a non-metal with a valency 3.
(a) Write an equation to show how Y forms as ion
(b) If Y is a diatomic gas, write an equation for the direct combination of X and Y to form a compound.

The following table shows the electronic configuration of the elements W, X, Y, Z:

Answer the following questions based on the table above:

What is the formula of the compound formed between X and Z.

The following table shows the electronic configuration of the elements W, X, Y, Z:

Answer the following question based on the table above:
What is the formula of the compound formed between W and X.

An element with the atomic number 19 will most likely combine chemically with the element whose atomic number is

State the type of bonding in the following molecule.
Calcium oxide

Element X is a metal with a valency 2; Y is a non-metal with a valency 3.
(a) Write an equation to show how Y forms as ion
(b) If Y is a diatomic gas, write an equation for the direct combination of X and Y to form a compound.

Define the following term: 

Efflorescence

Define the following term: 

Hygroscopy

Define the following term: 

Water of crystallization

What is deliquescence? What name is given to the compounds exhibiting such property?

Give four substances which contain water of crystallization and write their common name.

Fill in the blank
___________ is the phenomenon by which hydrated salts on exposure to dry air, lose their water of crystallization and crumble to powder.