Question 1

Which of the following elements were placed correctly in Mendeleev’s periodic table?

Argon and potassium
Cobalt and nickel
Tillerium and iodine
Oxygen and fluorine

Answer

Correct Option: D

Question 2

Which of the following elements belong to the actinide series?

Ac, Th, Pa
La, Ce, Pr
F, CI, Pr
Sc, Ti, V

Answer

Correct Option: A

Question 3

Modern periodic table is based on the atomic number of elements. Which of the following experiments proved the significance of the atomic number?

Millikan's drop experiment
Moseley's work on X-ray spectra
Bragg's work on X-ray diffraction
Discovery of X-ray roentgen

Answer

Correct Option: B

Question 4

The screening effect of s orbital electron is

greater than p, but lesser than d and f electrons
lesser than p, d and f electrons
greater than p, d and f electrons
equal to p, d and f electrons

Answer

Correct Option: C

Question 5

Which of the following statements is/are not true about the diagonal relationship of Be and Al?

(A) Both react with NaOH to liberate hydrogen. (B) Their oxides are basic. (C) They are made passively by nitric acid. (D) Their carbides give acetylene on treatment with water.

Only (A)
(B) and (C)
Only (D)
(B) and (D)

Answer

Correct Option: D

Question 6

Which of the following is the correct order of polarising powers of cations?

K⁺ < Be²⁺ < Mg²⁺ < Ca²⁺
K⁺ < Ca²⁺ < Mg²⁺ < Be²⁺
Ca²⁺ < Mg²⁺< Be²⁺ < K⁺
Be²⁺ < Mg²⁺ < Ca²⁺ < K⁺
Be²⁺ < Ca²⁺< Mg²⁺ < K⁺

Answer

Correct Option: B

Question 7

Which of the following is correct about ionisation potential?

It is independent of atomic radii.
It increases with increase in atomic radii.
It remains constant with increase in atomic radii.
It decreases with increase in atomic radii.

Answer

Correct Option: D

Question 8

Which of the following statements is true?

Atomic radii of elements decrease gradually from left to right.
Metallic character increases across a period.
Chemical reactivity increases and then decreases across a period.
Chemical reactivity increases across a period.

Answer

Correct Option: A

Question 9

In which of the following arrangements is the order NOT according to the property indicated against it?

Li < Na < K < Rb : Increasing metallic radii
I < Br < F < Cl : Increasing electron gain enthalpies (with negative sign)
B < C < N < O : Increasing first ionisation enthalpies
Al³⁺ < Mg²⁺ < Na⁺ < F^- : Increasing ionic size

Answer

Correct Option: C

Question 10

Which of the following pairs contains an example of metalloid elements in the periodic table?

Sodium and potassium
Fluorine and chlorine
Calcium and magnesium
Boron and silicon

Answer

Correct Option: D

Question 11

From the ground state of electronic configuration of various electrons, which will have the highest second ionisation energy?

1s², 2s², 2p⁶, 3s²
1s², 2s², 2p⁶, 3s¹
1s², 2s², 2p⁶
1s², 2s², 2p⁵

Answer

Correct Option: B

Question 12

Which of the following elements do not belong to the same group, but show chemical similarities?

Mg, Ca
K, Rb
Be, Al
B, Al

Answer

Correct Option: C

Question 13

The electronic configurations of four elements are given as follows:

[Xe] 6s¹2. [Xe] 4f¹⁴ 5d¹ 6s²3. [Ar]4s²4p⁵4. [Ar]3d⁷4s²

Which of the following statements about these elements is not correct?

1 is a strong reducing agent.
2 is a d-block element.
3 has high electron affinity.
4 shows variable oxidation state.

Answer

Correct Option: B

Question 14

The successive ionisation energy values for an element 'X' are given below:

(i) 1^st ionisation energy = 410 kJ mol^-1(ii) 2^nd ionisation energy = 820 kJ mol^-1(iii) 3^rd ionisation energy = 1100 kJ mol^-1 (iv) 4^th ionisation energy = 1500 kJ mol^-1(v) 5^th ionisation energy = 3200 kJ mol^-1

Find out the number of valence electrons for an atom of 'X'.

4
3
5
2

Answer

Correct Option: A

Question 15

Pick out the statement(s) which is/are not true about the diagonal relationship of Li and Mg.

(i) Polarising powers of Li⁺ and Mg²⁺ are almost the same. (ii) Both Li and Mg decompose water very quickly. (iii) LiCl and MgCl₂ are deliquescent. (iv) Like Li, Mg does not form solid bicarbonates.

(i) and (ii)
(ii) and (iii)
Only (ii)
Only (i)
Only (iii)

Answer

Correct Option: C

Description: Periodic Table and Periodicity - 3
Number of Questions: 15
Created by: Sharvani Hegde
Tags: Periodic Table and Periodicity - 3 Atomic Number and Periodic Law , Present Form of The Periodic Table Modern Periodic Table Periodic Trends in Properties Periodic Trends in Chemical Properties of Elements Types of Elements Electronic Configuration and Periodicity Nomenclature of Elements Common Names of Groups Ionisation Enthalpy Electronic Configuration of Elements and Periodic Table

Periodic Table and Periodicity (Hard)

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