Chemistry-Periodic Classification of Elements (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 16 - 20 of 23

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Question number: 16

» Chemistry » Periodic Classification of Elements

MCQ▾

Question

When a metal ‘M’ reacts with oxygen, following reaction takes place.

4M+3O22M2O3

This equation represents

Choices

Choice (4) Response
a.

oxidation reaction

b.

reduction reaction

c.

combination and oxidation reaction

d.

displacement and oxidation reaction

Question number: 17

» Chemistry » Periodic Classification of Elements

MCQ▾

Question

Which of the following statements about the modern periodic table is true?

Choices

Choice (4) Response
a.

It has 18 vertical columns called periods

b.

It has 7 vertical columns called periods

c.

It has 7 horizontal rows called groups

d.

It has 18 horizontal rows called periods

Question number: 18

» Chemistry » Periodic Classification of Elements

MCQ▾

Question

Arrange the following elements in increasing order of their ionization energies

Nb, Sr, Y, Cd, Rb

Choices

Choice (4) Response
a.

Cd<Nb<Y<Sr<Rb

b.

Cd<Rb<Nb<Y<Sr

c.

Sr<Y<Nb<Rb<Cd

d.

Rb<Sr<Y<Nb<Cd

Question number: 19

» Chemistry » Periodic Classification of Elements

MCQ▾

Question

H2S(g)+Cl2(g)2HCl(g)+S(s)

The reaction is interpreted as

Choices

Choice (4) Response
a.

H2S is getting reduced and Cl2 is getting oxidized

b.

Only H2S is oxidized

c.

H2S and Cl2 are reduced

d.

H2S is getting oxidized and Cl2 is getting reduced

Question number: 20

» Chemistry » Periodic Classification of Elements

MCQ▾

Question

Which of the following pairs of elements represents a mole ratio of 1: 1?

Choices

Choice (4) Response
a.

20 g of C and 12 g of C

b.

20 g of Ca and 20 g of Na

c.

12 g of Mg and 6 g of C

d.

10 g of C and 12 g of Mg

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