Chemistry-Structure of Atom (NTSE Stage-2 (National-Level) Scholastic-Aptitude & Language Comprehension): Questions 1 - 4 of 10

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Question number: 1

» Chemistry » Structure of Atom

Appeared in Year: 2013

MCQ▾

Question

Which of the following is a suitable example for illustrating the law of conservation of mass? (atomic mass of O = 16, H = 1)

Choices

Choice (4) Response

a.

18 g of water freezes at 4°C to give same mass of ice

b.

18 g of water is completely converted into vapour state on heating

c.

18 g of water in liquid state is obtained by heating 18 g of ice

d.

18 g of water is formed by the combination of 16 g oxygen with 2 g of hydrogen

Question number: 2

» Chemistry » Structure of Atom

Appeared in Year: 2013

MCQ▾

Question

An element X (atomic number 12) reacts with another element Y (atomic number 17) to form a compound Z. Which of the following statements is true regarding this compound?

I. Molecular formula of Z is Equation .

II. It is soluble in water.

III. X and Y are joined by sharing of electrons.

IV. It would conduct electricity in the molten, state.

Choices

Choice (4) Response

a.

II and III

b.

I, III and IV

c.

I and III

d.

II and IV

Question number: 3

» Chemistry » Structure of Atom

MCQ▾

Question

The head of match stick contains

Choices

Choice (4) Response

a.

white phosphorus only

b.

antimony chloride + red phosphorus

c.

antimony trisulphide + potassium chlorate

d.

antimony trisulphide + potassium chloride

Question number: 4

» Chemistry » Structure of Atom

MCQ▾

Question

Which one among the following is the main ingredient in cement?

Choices

Choice (4) Response

a.

Limestone

b.

Gypsum

c.

Clay

d.

Ash

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