(English Medium) ICSE Class 9 - CISCE Question Bank Solutions for Chemistry

Name and state the following with reference to the elements of the first three periods of the periodic table.

An electrovalent compound formed by an alkaline earth metal and a halogen.

Name and state the following with reference to the elements of the first three periods of the periodic table.

Bridge elements of Period 3 of Group 1,2 and 3.

Name and state the following with reference to the elements of the first three periods of the periodic table.

Alkali metal in period 3 dissolves in the water giving a strong alkali.

Name and state the following with reference to the elements of the first three periods of the periodic table.

Typical elements of Groups 14 and 15.

On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.

A white crystalline solid which decrepitates on heating leaving a residue which fuses with the glass and evolves two gases one of which is coloured and acidic.

On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.

An amorphous substance which turns from pale green to black on strong heating evolving a colourless, acidic gas as the only gaseous product.

Covalent bonds can be single, double or triple covalent bonds. How many electrons are shared in each? Give an example of each type.

Taking MgCl₂ as an electrovalent compound, CCl₄ as a covalent compound, give four difference between electrovalent and covalent compounds

Potassium chloride is an electrovalent compound, while hydrogen chloride is a covalent compound, But, both conduct electricity in their aqueous solutions. Explain.

Define a covalent bond.

Give an example of the covalent bond formed by

(i) Similar atoms (ii) Dissimilar atoms 

In the formation of electrovalent compounds, electrons are transferred from one element to another. How are electrons involved in the formation of a covalent compound?

State in brief, the preventive steps to control the pollution of water bodies in the locality. 

Explain the methods of controlling water pollution.

Molecular reactions are ______ in the covalent compound.

______ & ______ atoms have similar electronegativities.