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

Arrange the following as per the instruction given in the bracket
Na,Li,K (Increasing ionization energy)

Define
an electrovalent compound

Define
a covalent compound.

Give three uses of ammonium chloride.

Explain the following:

Ammonium nitrate is not used in the laboratory preparation of NH₃.

Give one use each of four different compounds of ammonia.

The changes in the properties of elements on moving from left to right across a period of the Periodic Table. For the property, choose the correct answer. 

The ionization potential: 

Why drying agents such as P₂O₅ and CaCl₂ are not used to dry NH₃?

Name the common refrigerant. How does it deplete the ozone layer?

State the advantages of using ammonia as a refrigerant?

1. Which feature of the ammonia molecule leads to the formation of the ammonium ion when ammonia dissolves in water?
2. Name the other ion formed when ammonia dissolves in water.
3. Give one test that can be used to detect the presence of the ion produced in (b).

Give reason for the following:

Ionisation potential decreases down a group.

State the term for the following:

The group obtained by removing one hydrogen atom from the parent alkane.

Arrange the following as per the instruction given in the bracket:

Potassium, Lithium, Sodium (increasing order of ionization potential).

Identify the following:

The energy required to remove an electron from a neutral gaseous atom.

Arrange the following as per instruction given in the bracket.

Na, Mg, Cl, S, Si (increasing ionisation potential)

Arrange the following as per instruction given in the bracket.

Li, K, Na, H (decreasing order of their potential ionisation)

First ionisation enthalpy of two elements X and Y are 500 kJ mol⁻¹ and 375 kJ mol⁻¹ respectively. Comment about their relative position in a group as well as in a period.

Arrange the following in order of increasing ionisation energy:

P, Na, Cl

Explain your choice.