Chemistry (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 138 - 142 of 142

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Question number: 138

» Chemistry » Structure of Atom

MCQ▾

Question

Dry ice used to preserve food using non-cyclic refrigeration is the solid form of

Choices

Choice (4) Response

a.

CO2

b.

CO

c.

NO2

d.

N2

Question number: 139

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

Consider the following statements

I. The first artificially synthesized organic molecule was urea.

II. Urea is also known as diaminomethanal.

Whichof the abovestatement (s) is/are correct?

Choices

Choice (4) Response

a.

I and II

b.

Neither I nor II

c.

Only II

d.

Only I

Question number: 140

» Chemistry » Structure of Atom

MCQ▾

Question

Consider the following statements

I. Positively charged ions are known as cations.

II. Negatively charged ions are known as anions.

Which of the about statement) is/are correct?

Choices

Choice (4) Response

a.

I and II

b.

Neither I nor II

c.

Only II

d.

Only I

Question number: 141

» Chemistry » Acid Bases and Salt

MCQ▾

Question

In an average adult human body, the amount of NaCl is about

Choices

Choice (4) Response

a.

240 g

b.

250 g

c.

260 g

d.

280 g

Question number: 142

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

CH3CH2OHAlkalineKMnO4+HeatAcidifiedK2Cr2O7ProductProduct?

Choices

Choice (4) Response

a.

CH3COOH

b.

CH2=CH2+H2O

c.

CH4+HCHO

d.

CH3CHO+H2

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