11.

Choose the correct answer from the options given below:
Ionisation potential increases over a period  from left to right because the:

• Atomic radius increases and nuclear charge increases.

• Atomic radius decreases and nuclear charge decreases

• Atomic radius increases and nuclear charge decreases

• Atomic radius increases and nuclear charge decreases

If an element A belong to period 3 and group II then it will have:

• 3 shells and 2 valence electrons

• 2 shells and 3valence electrons

• 3 shells and 3 valence electrons

• 3 shells and 3 valence electrons

Choose the correct answer from the options given below:
A compound X consists of only molecules. Hence X will have.

• A crystalline hard structure

• A low melting point and low boiling point

•  An ionic bond

•  An ionic bond

The molecules containing a triple covalent bond is

• Ammonia

• Methane

• Water

• Water

Choose the correct answer from the options given below:
When fused lead bromide is electrolyzed we observe.

• A silver grey deposit at anode and a reddish brown deposit at cathode.

• A silver grey deposit at cathode and a reddish brown deposite at anode

•  A silver grey deposit at cathode and reddish brown deposite at anode.

•  A silver grey deposit at cathode and reddish brown deposite at anode.

The electrolyte used for electroplating an article with silver is:

• Silver nitrate solution

• Silver cyanide solution

• Sodium argentocynaide solution

• Sodium argentocynaide solution

Choose the correct answer from the option given below:

The main ore used for the extraction of iron is :

• Haematite

• Calamine

• Bauxite

• Bauxite

Heating an ore in a limited supply of air or in the absence of air at a temperature just below its melting point is known as:

• Smelting

• Ore dressing

• Calcination

• Calcination

Aluminium powder is used in thermite welding because:

• It is strong reducing agent

• It is strong oxidising agent

• It is corrosion resistant

• It is corrosion resistant

Choose the correct answer from the option given below:

The I.U.P.A.C. name of acetylene is:

• Propane

• Propyne

• Ethane

• Ethane