Chemistry (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 31 - 36 of 144

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Question number: 31

» Chemistry » Structure of Atom

MCQ▾

Question

The most common oxidation number for silicon in a compound would be

Choices

Choice (4) Response

a.

+ 1

b.

+3

c.

+2

d.

+4

Question number: 32

» Chemistry » Periodic Classification of Elements

MCQ▾

Question

What is the most correct name for the ionic compound formed by

Choices

Choice (4) Response

a.

Iron (IV) chloride

b.

Iron (II) chloride

c.

Iron (I) chloride

d.

Iron (III) chloride

Question number: 33

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

A large iceberg melts at the base but not at the top because

Choices

Choice (4) Response

a.

higher pressure at the base lowers the melting point of ice

b.

ice at the base contains impurities

c.

the base of iceberg remains in warmer conditions

d.

ice at the top is different kind

Question number: 34

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

Which of these methods is used to extract alcohol from a mixture of alcohol and water?

Choices

Choice (4) Response

a.

Oxidation

b.

Bleaching

c.

Crystallization

d.

Distillation

Question number: 35

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

Varsha adds a few drop of the universal indicator solution to a dilute solution of Equation taken in a test-tube. She observed………colour.

A test-tube containing dilute solution of NaHCO3

A Test-Tube Containing Dilute Solution of NaHCO3

Find colour of mixture after adding universal indicator solution in test-tube

Choices

Choice (4) Response

a.

green

b.

Yellow

c.

mustard

d.

blue

Question number: 36

» Chemistry » Metals & Non Metals

MCQ▾

Question

A compound ‘X’ is an allotrope of an element of atomic number 6. Compound ‘X’ is greyish-black in color. By nature, it is opaque and it is used in making ‘pencil leads’ and black paints. Identify the compound ‘X’.

Choices

Choice (4) Response

a.

Carbon

b.

Graphite

c.

Lead

d.

Fullerene

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