(English Medium) ICSE Class 10 - CISCE Important Questions

Define the following term:

Noise

The energy required to remove an electron from a neutral isolated gaseous atom and convert it into a positively charged gaseous ion is called ____________. (electron affinity, ionization potential,
electronegativity)

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

He, Ar, Ne (Increasing order of the number of electron shells)

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

Na, Li, K (Increasing Ionisation Energy)

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

Na, K, Li (Increasing atomic size)

Draw an electron dot diagram to show the formation of the following compound:

Methane

[H = 1, C = 6]

Draw an electron dot diagram to show the formation of each of the following compounds:

Magnesium Chloride

[H = 1, C = 6, Mg = 12, Cl = 17]

Rewrite the following sentences by using the correct symbol > (greater than) or < (less than) in the blanks given

The ionization potential of potassium is _________________ that of sodium.

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

Mg, Cl, Na, S, Si (decreasing order of atomic size).

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:

Ionisation potential increases over a period from left to right because of the

(A) Atomic radius increases and nuclear charge increases

(B) Atomic radius decreases and nuclear charge decreases

(C) Atomic radius increases and nuclear charge decreases

(D) Atomic radius decreases and nuclear charge increases

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:

Formation of ions from molecules

Give one word or a phrase:

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

Give one word or a phrase:

A process of formation of ions from molecules which are not in the ionic state.

Give a reason for the following:

Ionisation potential increases across a period, from left to right.

An element in period 3 whose electron affinity is zero.

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

Arrange the following according to the instruction given in the bracket:

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

Why is the electron affinity of fluorine less than chlorine?