Chemistry (NTSE Stage-2 (National-Level) Scholastic-Aptitude & Language Comprehension): Questions 60 - 62 of 63

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Question number: 60

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

There is a mixture of three solid compounds A, B and C. Out of these compounds A and C are soluble in water and compound C is sublimable also. In what sequence the following techniques can be used for their effective separation?

I. Filtration

II. Sublimation

III. Crystallisation from water extract

IV. Dissolution in water

Choices

Choice (4) Response

a.

I, II, IV and III

b.

II, IV, I and III

c.

IV, I, II and III

d.

I, II, III and IV

Question number: 61

» 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.

III and IV

c.

II and IV

d.

I and II

Question number: 62

» Chemistry » Physical and Chemical Changes

Appeared in Year: 2013

MCQ▾

Question

An element X combines with hydrogen to form a compound Equation . The element X is placed on the right side of the periodic table. What is true about the element X?

I. Has valence electrons.

II. Is a metal and is solid.

III. Is a non-mental and is a gas.

IV. Has a 5 valence electrons E

V. Equation reacts with water to form a basic compound.

Choices

Choice (4) Response

a.

V, I and II

b.

I, II and III

c.

III, IV and V

d.

II, III and IV

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