Chemistry (NTSE Stage-2 (National-Level) Scholastic-Aptitude & Language Comprehension): Questions 49 - 53 of 63

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Question number: 49

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

A highly reactive element X is stored under water. It readily reacts with oxygen of air to give a compound Y, which dissolves in water. The aqueous solution of Y changes blue litmus solution to red. The element X is

Choices

Choice (4) Response
a.

Phosphorous

b.

Sulphur

c.

Potassium

d.

Sodium

Question number: 50

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

Two elements A and B on burning in air give corresponding oxides. Oxides of both A and B are soluble in water. The aqueous solution of oxide of A is alkaline and reacts with aqueous solution of oxide of B to give another compound. Identify A and B.

Choices

Choice (4) Response
a.

A is non-metal and B is metal

b.

A and B both are metals

c.

A and B both are non-metals

d.

A is metal and B is non-metal

Question number: 51

» Chemistry » Acid Bases and Salt

MCQ▾

Question

AlO4MNaOH Solution will have a pH of

Choices

Choice (4) Response
a.

4

b.

10

c.

8

d.

6

Question number: 52

» Chemistry » Acid Bases and Salt

MCQ▾

Question

The bleaching action of bleaching powder (CaOCl2) is due to

Choices

Choice (4) Response
a.

Cl2 present

b.

Ca present

c.

oxygen present

d. Question does not provide sufficient data or is vague

Question number: 53

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

The necessary conditions for combustion process to occur are

I. availability of air/oxygen.

II. availability of air/oxygen and fuel.

III. temperature of fuel below ignition temperature.

IV. temperature of fuel above ignition temperature.

Select the correct alternative.

Choices

Choice (4) Response
a.

I and II

b.

II and IV

c.

IV and I

d.

III and I

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