(English Medium) ICSE Class 10 - CISCE Important Questions for Chemistry

An element with the atomic number 19 will most likely combine chemically with the element whose atomic number is ______.

Identify the term/substance in the following:

The tendency of an atom to attract electrons to itself when combined in a compound.

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.

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

The electronegativity of iodine is ___________ that of Chlorine

Use the letters only written in the Periodic Table given below to answer the questions that Follow :

1) State the number of valence electrons in atom J.

2) Which element shown forms ions with a single negative charge?

3)Which metallic element is more reactive than R?

4) Which element has its electrons arranged in four shells?

If an element has seven electrons in its outermost shell then it is likely to have the ______________ atomic size among all the elements in the same period.

The following table shows the electronic configuration of the elements W, X, Y, Z:

Answer the following questions based on the table above:

1) What type of Bond is formed between :

a) W and X

b) Y and Z

2) What is the formula of the compound formed between :

a) X and Z

b) W and X

Choose the most appropriate answer of the following:

Among the elements given below, the element with the least electronegativity is:

(A) Lithium

(B) Carbon

(C) Boron

(D) Fluorine

Choose the most appropriate answer of the following:

Which of the following would weigh the least?

(A) 2-gram atoms of Nitrogen.

(B) 1mole of Silver

(C) 22.4 liters of oxygen gas at 1 atmospheric pressure and 273K

(D) 6.02 x 10²³ atoms of carbon.

[Atomic masses: Ag=108, N=14, O=16, C=12]

Calculate the mass of Calcium that will contain the same number of the atom as are present in 3.2 gm of Sulphur.

[Atomic masses: S=32, Ca=40]

The metal of Group 2 from top to bottom arc Be, Mg, Ca, Sr, and Ba.

1) Which one of these elements will form ions most readily and why?

2) State the common feature in the electronic configuration of all these elements.

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

Cs, Na, Li, K, Rb (increasing order of metallic character).

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

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

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

Na, K, Cl, S, Si (increasing order ionization energy)

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

Cl, F, Br, I (increasing order of electron affinity)

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

An element Z has atomic number 16. Answer the following questions on Z:

1) State the period and group to which Z belongs

2) Is Z a metal or a non-metal?

3) State the formula between Z and hydrogen

4) What kind of a compound is this?