Chemistry (NTSE Stage-1 (State-Level) Scholastic-Aptitude & Language Comprehension): Questions 70 - 75 of 144

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Question number: 70

» Chemistry » Physical and Chemical Changes

MCQ▾

Question

Ankit while heating solid lead nitrate taken in a test-tube, observed

Choices

Choice (4) Response

a.

brown residue of

b.

green residue of

c.

yellow residue of

d.

white residue to

Question number: 71

» Chemistry » Periodic Classification of Elements

MCQ▾

Question

Arrange the following elements in increasing order of their ionization energies

Nb, Sr, Y, Cd, Rb

Choices

Choice (4) Response

a.

b.

c.

d.

Question number: 72

» Chemistry » Carbon and Its Compounds

MCQ▾

Question

Which of the following pairs includes isomeric compounds?

Choices

Choice (4) Response

a.

Aldehydes and carboxylic acids

b.

Alcohols and aldehydes

c.

Alcohols and ketones

d.

Ketones and aldehydes

Question number: 73

» Chemistry » Carbon and Its Compounds

Appeared in Year: 2013

MCQ▾

Question

The type of radiation absorbed by molecule in atmosphere are

Choices

Choice (4) Response

a.

X-rays

b.

UV-rays

c.

Infra-red rays

d.

Gamma rays

Question number: 74

» Chemistry » Structure of Atom

MCQ▾

Question

Which of the following will have equal number of electrons?

Choices

Choice (4) Response

a.

Cl and Br

b.

Ar and Ne

c.

Na + and Mg 2+

d.

Mg 2+ and Ca 2+

Question number: 75

» Chemistry » Structure of Atom

MCQ▾

Question

Mg has three natural isotopes whose isotopic masses and relative abundances are respectively 23.98 (78.60%), 24.98 (10.11%) and 25.98 (11.29%). The atomic mass of Mg will be

Choices

Choice (4) Response

a.

24.31

b.

23.95

c.

23.42

d.

24.95

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