Chemistry [NTSE Stage-2 (National-Level) Scholastic-Aptitude & Language Comprehension]: Questions 47 - 50 of 63

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Question 47

Appeared in Year: 2013

Question MCQ▾

An element X combines with hydrogen to form a compound . 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. reacts with water to form a basic compound.

Choices

Choice (4)Response

a.

I, II and III

b.

III, IV and V

c.

V, I and II

d.

II, III and IV

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Question 48

Question MCQ▾

Which of the following has the same monomer unit?

Choices

Choice (4)Response

a.

Rayon and nylon

b.

Nylon and cellulose

c.

Cellulose and rayon

d.

Polyester and nylon

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Question 49

Question MCQ▾

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

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Question 50

Question MCQ▾

When a base is dissolved in water

Choices

Choice (4)Response

a.

no change in concentration of OH- ions per unit volume occurs

b.

concentration of OH- ions per unit volume increases

c.

concentration of OH- ions per unit volume decreases

d.

concentration of OH- ions per unit volume may increase or decrease depending upon the nature of the base

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