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

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 B is Zero.

Fill in the blank
Energy released when electron is added to a neutral gaseous atom is called ______.

Fill in the blank
The nature of oxide Al₂O₃ is ____

Fill in the blank
Noble gases have ______ electron affinity.

State whether the following statement is true or false
Al₂O₃ is an amphoteric oxide.

State whether the following statement is true or false
The elements with higher electron affinity have higher ionization potential.

Arrange the following in increasing order of property indicated
F, Cl, Br, I (electron affinity)

What is electron affinity?

Explain
Halogens have high electron affinity.

With reference to the variation of properties in the Periodic Table, which of the following is generally true?
Electron affinity increases going down a group.

The following questions refer to the Periodic Table.
Which of the elements has the greatest electron affinity among the halogens?

Choose the correct answer:
Among the period 2 elements the one which has high electron affinity is

Down the group, electron affinity ______.

Among the Period 2 elements, the element which has high electron affinity is

Arrange the following as per instruction given in the bracket.
Cl, F, Br, I (increasing electron affinity)

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 electron affinity of elements in groups 1 to 7:

In a period, increase in electron affinity increases ______.

On descending a group, ______ in ionisation potential as well as electron affinity ______ oxidising capacity.

Explain the following method with example.  

Double decomposition (precipitation)