NSTSE (National Science Talent Search Exam- Unified Council) Class 9: Questions 1912 - 1918 of 2000

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Question number: 1912

» Chemistry » Atoms & Molecules

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Question

Which of the following are the symbols for the elements Lead and Mercury?

Choices

Choice (4) Response

a.

Pb, Hg

b.

c.

d.

Hg, Pb

Question number: 1913

» Chemistry » Structure of the Atom

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Question

The mass of photon having wavelength in?

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1914

» Chemistry » Atoms & Molecules

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Question

Which of the following in known to be Avogadro number?

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1915

» Chemistry » Atoms & Molecules

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Question

Calculate the weight of moles of magnesium nitrate?

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1916

» Chemistry » Matter

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Question

What observation will be found when a solid melts?

Choices

Choice (4) Response

a.

The movement of its molecules decreases

b.

The temperature decreases although heat is supplied

c.

Molecular move closer

d.

Its molecules move further apart

Question number: 1917

» Chemistry » Atoms & Molecules

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What is the molecular weight of and oxidation number of aluminum ?

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 1918

» Chemistry » Atoms & Molecules

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Question

Which of the following in exact molar mass of sodium Hydroxide

Choices

Choice (4) Response

a.

b.

c.

d.

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