Chemistry-Structure of Atom (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 18 - 22 of 34

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Question number: 18

» Chemistry » Structure of Atom

MCQ▾

Question

Consider the flowing statements

I. On moving from left to right in period atomic radii increases.

II. On moving from left to right in period atomic radii decreases. Which of the above statement (s) is/are correct?

Choices

Choice (4) Response

a.

Only II

b.

I and II

c.

Only I

d.

None of the above

Question number: 19

» Chemistry » Structure of Atom

MCQ▾

Question

Which of the following will have equal number of electrons?

Choices

Choice (4) Response

a.

Cl and Br

b.

Ar and Ne

c.

Na + and Mg 2+

d.

Mg 2+ and Ca 2+

Question number: 20

» Chemistry » Structure of Atom

MCQ▾

Question

Mg has three natural isotopes whose isotopic masses and relative abundances are respectively 23.98 (78.60%), 24.98 (10.11%) and 25.98 (11.29%). The atomic mass of Mg will be

Choices

Choice (4) Response

a.

24.31

b.

23.95

c.

23.42

d.

24.95

Question number: 21

» Chemistry » Structure of Atom

MCQ▾

Question

The electronic configuration of an ion M 2+ is 2, 8 and 14. If its mass is 56, the number of neutrons in its nucleus is

Choices

Choice (4) Response

a.

34

b.

30

c.

42

d.

32

Question number: 22

» Chemistry » Structure of Atom

MCQ▾

Question

Structures of nuclei of three atoms A, B and C are given below.

A has 90 protons and 146 neutrons B has 92 protons and 146 neutrons C has 90 protons and 148 neutrons

Based on the above data, which of these atoms are isotopes and which are isobars?

Choices

Choice (4) Response

a.

A and C are isotopes, A and B are isobars

b.

A and B are isotopes, A and C are isobars

c.

A and C are isotopes, B and C are isobars

d.

B and C are isobars, A and B are isotopes

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