11th Standard Chemistry Periodic Classification of Elements English Medium Free Online Test One Mark Questions with Answer Key 2020 - 2021

1.

The First ionisation potential of Na, Mg and Si are 496, 737 and 786 kJ mol^-1 respectively. The ionisation potential of Al will be closer to ___________

(a)

760 kJ mol^-1

(b)

575 kJ mol^-1

(c)

801 kJ mol^-1

(d)

419 kJ mol^-1

2.

In a given shell the order of screening effect is __________

(a)

s > p > d > f

(b)

s > p > f > d

(c)

f > d > p > s

(d)

f > p > s > d

3.

Which of the following is second most electronegative element?

(a)

Chlorine

(b)

Fluorine

(c)

Oxygen

(d)

Sulphur

4.

The element with positive electron gain enthalpy is _________

(a)

Hydrogen

(b)

Sodium

(c)

Argon

(d)

Fluorine

5.

The correct order of electron gain enthalpy with negative sign of F, Cl, Br and I having atomic number 9, 17, 35 and 53 respectively is _____________

(a)

I > Br > Cl > F

(b)

F > Cl > Br > I

(c)

Cl > F > Br > I

(d)

Br > I > Cl > F

6.

Which among the following has the highest ionisation energy _______________

(a)

Ne

(b)

Na

(c)

K

(d)

Kr

7.

d-block elements form ____ compounds.

(a)

ionic

(b)

covalent

(c)

Coordinate

(d)

both (a) and (b)

8.

The elements at the extreme left of periodic table has strong behaviour ______

(a)

Oxidizing

(b)

Reducing

(c)

both oxidisation and reducing

(d)

electro negative

9.

The element with Z = 24 is placed in the _____ period

(a)

5

(b)

2

(c)

3

(d)

4

10.

The electronic configuration of nitrogen is _____

(a)

Is²2s²2p³

(b)

Is²2s² 2P_x¹2p_y¹2P₂¹

(c)

Is²2s¹2p⁴

(d)

both (a) and (b)

11.

There are _____ periods in the periodic table.

(a)

18

(b)

7

(c)

6

(d)

5

12.

Consider the following statements according to modern periodic table.
(i) Modern periodic table contains 18 vertical columns and 7 horizontal rows.
(ii) The elements after uranium are called transuranium elements
(iii) The 17th group elements are called chalcogens
(iv) The elements of Groups 13 to 18 are called p-block elements.
which of the following statement(s) given above is/are correct.

(a)

(i), (iii) & (iv)

(b)

(i), (ii) & (iii)

(c)

(i), (ii) & (iv)

(d)

all the 4 statements

13.

The horizontal rows in the periodic table are called as ______

(a)

group

(b)

family

(c)

period

(d)

column

14.

Law of triad was unable to explain for the element

(a)

Ca, Sr and Ba

(b)

Fe, Co, Ni

(c)

Li, Na, K

(d)

Cl, Br, I

15.

What would be the formula of the compound formed by A and B, where A has the valence 3 and B has the valence 3?

(a)

AB

(b)

AB₃

(c)

A₃B

(d)

3AB₃

16.

Which of the following is Dobereiner's triad?

(a)

Ne,Ca,Na

(b)

H₂, N₂, O₂

(c)

Li, Na, K

(d)

Na, Br, K

17.

Match the list I with List II and select the correct answer using. the code given below the lists.

List I		List II
A	Chancourtois	1	Addition of synthetic elements
B	Rang	2	Families and periods Long form
C	Glenn Seaborg	3	Modern periodic law
D	Moseley	4	First periodic law

(a)

A	B	C	D
1	3	2	4

(b)

A	B	C	D
4	2	1	3

(c)

A	B	C	D
3	4	1	2

(d)

A	B	C	D
2	1	4	3

18.

Period of an element is represented by _____ quantum number

(a)

Principal

(b)

Azimuthal

(c)

Magnetic

(d)

Spin

19.

The electronic configuration of the elements A and B are 1s², 2s ²,2p⁶,3s² and 1s², 2s²,2p⁵ respectively. The formula of the ionic compound that can be formed between these elements is ___________

(a)

AB

(b)

AB₂

(c)

A₂B

(d)

none of the above