Chemistry (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 65 - 70 of 142

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Question number: 65

» Chemistry » Periodic Classification of Elements

MCQ▾

Question

An element is soft and can be cut with a knife. It is very reactive and cannot be kept open in the air. It reacts vigorously with water. Can you name this element?

Choices

Choice (4) Response

a.

Mg

b.

S

c.

P

d.

Na

Question number: 66

» Chemistry » Carbon and Its Compounds

MCQ▾

Question

Which of the following pair of elements exhibit the property of catenation?

Choices

Choice (4) Response

a.

Carbon and sodium

b.

Sodium and silicon

c.

Silicon and carbon

d.

Chlorine and carbon

Question number: 67

» Chemistry » Acid Bases and Salt

MCQ▾

Question

Which of the following fact is not true about sodium hydrogen carbonate?

Choices

Choice (4) Response

a.

It is used as a raising agent in making cakes

b.

It is commonly known as baking soda

c.

Its white crystals are sparingly soluble in water

d.

It is also used in making ‘Borax’

Question number: 68

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

Ammonia on combining with hydrochloric acid, form dense white fumes of

Choices

Choice (4) Response

a.

ammonium chloride

b.

ammonium perchlorate

c.

ammonium hydrogen carbonate

d.

All of the above

Question number: 69

» Chemistry » Structure of Atom

MCQ▾

Question

A gas which is found in ________ helps in protecting us from harmful UV radiations. This gas is

Choices

Choice (4) Response

a.

oxygen in troposphere

b.

ozone in stratosphere

c.

ozone is mesosphere

d.

ozone in troposphere

Question number: 70

» Chemistry » Structure of Atom

MCQ▾

Question

The atomic numbers of four elements P, Q, R and S are 6, 8, 10 and 12, respectively. Which of the two elements can react to form ionic compounds?

Choices

Choice (4) Response

a.

R and S

b.

P and S

c.

Q and S

d.

P and Q

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