Chemistry (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 75 - 79 of 144

Get 1 year subscription: Access detailed explanations (illustrated with images and videos) to 1058 questions. Access all new questions we will add tracking exam-pattern and syllabus changes. View Sample Explanation or View Features.

Rs. 450.00 or

Question number: 75

» 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: 76

» 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: 77

» Chemistry » Periodic Classification of Elements

MCQ▾

Question

Equation

The reaction is interpreted as

Choices

Choice (4) Response

a.

Equation is getting reduced and Equation is getting oxidized

b.

Only Equation is oxidized

c.

Equation and Equation are reduced

d.

Equation is getting oxidized and Equation is getting reduced

Question number: 78

» Chemistry » Metals & Non Metals

MCQ▾

Question

Which one of the following metal oxides shows both acidic and basic characters?

Choices

Choice (4) Response

a.

Equation

b.

Equation

c.

Equation

d.

Equation

Question number: 79

» 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

f Page
Sign In