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

Element X is a metal with a valency 2, Y is 3 non- metal with a valency 3.

1) Write an equation to show how Y from an ion.

2) If Y is a diatomic gas, write an equation for the direct combination of X and Y to form a compound.

Choose the correct answer from the options given below:

If an element A belongs to Period 3 and Group II, then it will have

A. 3 shells and 2 valence electrons

B. 2 shells and 3 valence electrons

C. 3 shells and 3 valence electrons

D. 2 shells and 2 valence electrons

Give one word or phrase for the following:

The amount of energy released when an atom in the gaseous state accepts an electron to form an anion.

The energy released when an electron is added to a neutral gaseous isolated atom to form a negatively charged iron.

Define the term ‘electron affinity’.

Arrange the elements of second period in increasing order of their electron affinity. Name the elements which do not follow the trend in this period.

Electron affinity values generally _______ across the periods left to right and ______ down the group top to bottom.

State the factors on which electron affinity depends ?

Give reason:

Electron affinity of halogens is comparatively high ?

Give reason:

Electronegativity of chorine is higher than Sulphur?

Explain the following:

Halogens have a high electron affinity.

Explain the following:

The reducing power of element increases down in the group while decreases in a period.

Arrange the elements of group 17 and group 1 according to the given conditions.

Increasing electron affinity

Arrange the elements of group 17 and group 1 according to the given conditions.

Increasing electron affinity

Which has higher E.A. fluorine or Neon?

An element in period 3, whose electron affinity is zero:

How would you obtain a base from another base.

F, B, N, O  (In the increasing order of electron affinity) 

Why is the electron affinity of fluorine less than chlorine?

A, B, C are three elements in which B is an inert gas other than helium.With this information complete the following table.

Also, explain the following : Electron affinity of element A is more than that that of element C.