Loading [MathJax]/jax/output/HTML-CSS/jax.js
Chemistry questions and answers

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.

231.

Which of the following statements is correct about ionization energy? It

A.

decreases across the periods

B.

results in the formation of an anion

C.

causes Metalic nuclei to disintegrate

D.

decreases down the group

Correct answer is D

No explanation has been provided for this answer.

232.

Which of the following species has the largest ionic radius

A.

S2

B.

K+

C.

CI

D.

Ca2+

Correct answer is A

No explanation has been provided for this answer.

233.

What is the empirical formula of a hydrocarbon containing 0.160 moles of carbon and 0.640 moles of hydrogen

A.

CH2

B.

CH3

C.

CH4

D.

C2H4

Correct answer is C

No explanation has been provided for this answer.

234.

What is the concentration of a solution which contains 0.28g of potassium hydroxide in 100 cm3 of solution [KOH = 56]

A.

0.01 mol dm3

B.

0.05 mol dm3

C.

0.10 mol dm3

D.

0.50 mol dm3

Correct answer is B

No explanation has been provided for this answer.

235.

Student X titrated 25 cm3 of Na2CO3 with 0.1 mol dm3 HCI, using methyl orange as indicator. Student Y carried out the same exercise but used phenolphthalein as an indicator. Which of the following statements about the titration is true

A.

hydrogen chloride gas was released in the reactions in both titrations

B.

the titer values obtained from the titration are equal

C.

the tirer value obtained by X is twice that of Y

D.

the titer value obtained by Y is twice that of X

Correct answer is B

No explanation has been provided for this answer.