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Chemistry Questions and Answers

Learn more about the properties, composition, and structure of substances (elements and compounds) with these Chemistry questions and answers. This Test can be used by students preparing for Chemistry in JAMB, WAEC, NECO or Post UTME.

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651.

The radio isotope used in industrial radiography for the rapid checking of faults in welds and casting is?

carbon-14

phosphorus-32

cobalt-60

iodine-131

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

652.

How many atoms are present in 6.0g of magnesium? [Mg = 24, N.A = 6.02 x 10 $^{23}$ mol]

1.20 x 10 $^{22}$

2.4 x 10 $^{22}$

1.51 x 10 $^{22}$

3.02 x 10 $^{22}$

View answer & explanation

Correct answer is C

No explanation has been provided for this answer.

653.

What is the concentration of a solution containing 2g of NaOH in 100cm3 of solution? [Na = 23, O =16, H = 1]

0.40 moldm $^{-3}$

0.50 moldm $^{-3}$

0.05 moldm $^{-3}$

0.30 moldm $^{-3}$

View answer & explanation

Correct answer is B

No explanation has been provided for this answer.

654.

An aqueous solution of a metal salt, M. gives a white precipitate with NaOH which dissolves in excess NaOH. With aqueous ammonia, the solution of M also gives a white precipitate which dissolves in excess ammonia Therefore the cation in M is

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Correct answer is A

No explanation has been provided for this answer.

655.

The lUPAC name for

1-methyl pentane

3-methylbutane

2-methylbutane

1-dimethyl propane

View answer & explanation

Correct answer is C

The longest carbon chain is butane, with one substituent attached at carbon number 2

therefore the compound is named 2-methyl butane

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