Chemistry-Physical and Chemical Changes (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 38 - 42 of 42

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Question number: 38

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

Kanchan takes Cu, Fe, Zn and Al pieces separately in four test tubes labelled as I, II, III and IV respectively. She adds 10 mL of freshly prepared FeSO4 solution to each test tube and observes the color of the metal residue in each case.

Test tubes with different mixtures in it.

Test Tubes With Different Mixtures in It.

Find the color of metals which are in test tubes

She would observe a black residue in the test tubes.

Choices

Choice (4) Response
a.

I and III

b.

III and IV

c.

II and IV

d.

I and II

Question number: 39

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

Consider the following statements

I. The only two non-silvery metals are Cu and Au.

II. Hot peppers get their heat from capsaicin.

III. Bee stings are alkaline while wasp stings are acidic.

Which of the above statements is/are correct?

Choices

Choice (4) Response
a.

Only III

b.

I and II

c.

Only I

d.

I and III

Question number: 40

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

The changing of a solid directly into vapour on heating is called

Choices

Choice (4) Response
a.

Chromatography

b.

Crystallisation

c.

Sublimation

d.

Distillation

Question number: 41

» 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: 42

» 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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