Chemistry [NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension]: Questions 75 - 80 of 143

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Question 75

Question MCQ▾

The electronic configuration of an ion M2 + is 2,8 and 14. If its mass is 56, the number of neutrons in its nucleus is

Choices

Choice (4)Response

a.

32

b.

30

c.

34

d.

42

Edit

Question 76

Question MCQ▾

The reaction is interpreted as

Choices

Choice (4)Response

a.

is getting oxidized and is getting reduced

b.

is getting reduced and is getting oxidized

c.

and are reduced

d.

Only is oxidized

Edit

Question 77

Question MCQ▾

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

Choices

Choice (4)Response

a.

b.

c.

d.

Edit

Question 78

Question MCQ▾

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.

B and C are isobars, A and B are isotopes

b.

A and C are isotopes, B and C are isobars

c.

A and C are isotopes, A and B are isobars

d.

A and B are isotopes, A and C are isobars

Edit

Question 79

Question MCQ▾

The normality of 0.3 M phosphoric acid is

Choices

Choice (4)Response

a.

0.6

b.

0.3

c.

0.1

d.

0.9

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Question 80

Question MCQ▾

Which of the following gases՚ is known as tear gas?

Choices

Choice (4)Response

a.

Methyl isocyanides

b.

Nitrous oxide

c.

Chloropicrin

d.

Sulphur dioxide

Edit