Chemistry-Structure of Atom (NTSE Stage-2 (National-Level) Scholastic-Aptitude & Language Comprehension): Questions 1 - 3 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 has 7 electrons in its L shell. What is true about the element X?

I. It belongs to period 9 of modern periodic table.

II. Its atom contains 9 protons.

III. It has a valency of 7.

IV. Its atoms can accept an electron to acquire noble gas configuration.

Choices

Choice (4) Response

a.

II and III

b.

II and IV

c.

III and IV

d.

I and II

Question number: 3

» 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 XY2 .

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

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