(English Medium) ICSE Class 10 - CISCE Important Questions

 Li, K, Na, H (In the decreasing order of their ionization potential) 

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

Why is the electron affinity of fluorine less than chlorine?

An element with the largest atomic radius among the following is ______.

Give reason for the following:

Ionisation potential decreases down a group.

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

Carbon, Fluorine, Beryllium (decreasing order of atomic size).

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

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

₁H² is an isotope of hydrogen. In the modern Periodic Table it will ______.

In Period 3 of the Periodic Table, element B is placed to the left of element A. On the basis of this information, choose the correct word from the option to complete the following statement:

The element A would probably have ______ electron affinity than B.

In Period 3 of the Periodic Table, element B is placed to the left of element A. On the basis of this information, choose the correct word from the option to complete the following statement:

The element A would have ______ atomic size than B.

Choose the correct answer from the options given below:

Which of the following is a common characteristic of a covalent compound?

1) high melting point

2) consists of molecules

3) always soluble in water

4) Conducts electricity when it is in the molten state

State the type of bonding in the following molecule.

Water

Identify the term/substance in the following:

The electrons present in the outermost shell of an atom.

By drawing an electron dot diagram show the formation of Ammonium ion [Atomic No.: N = 7 and H = 1]

Choose the most appropriate answer of the following:

Bonding in this molecule can be understood to involve coordinate bonding

(A) Carbon tetrachloride

(B) Hydrogen

(C) Hydrogen chloride

(D) Ammonium chloride

Give appropriate scientific reasons for Carbon tetrachloride does not conduct electricity.

Explain the bonding in methane molecule using electron dot structure.

Choose the most appropriate answer from the following list of oxides which fit the description.

A covalent oxide of a metalloid.

Name the following:

The property of element by virtue of which atoms of the element can link to each other in the form of a long chain or ring structure.

Identify the anion present in the following compounds:

A salt M on treatment with concentrated sulphuric acid produces a gas which fumes in moist air and gives dense fumes with ammonia