Post Utme Chemistry Past Questions and Answers

Question 1036:

After the electrolysis of aqueous solution of \(AgNO _{3}\) using platinum electrodes, the ions remaining in solution are ____________

A. \(Ag ^{+}\)and \(NO _{3}\)
B. \(H +\) and \(OH\)
C. \(Ag ^{+}\)and \(OH ^{-} \)
D. \(H ^{+}\)and \(NO _{3}^{-}\)

Question 1037:

How many hydrogen atoms are present in \(51.0 g\) of hydrogen sulphide?
\(\left[ H =1, S =32, N _{ A }=6.02 \times 10^{23}\right]\)

A. \(6.02 \times 10^{23}\)
B. \(9.03 \times 10^{23}\)
C. \(9.03 \times 10^{24}\)
D. \(1.81 \times 10^{24}\)

Question 1038:

\(1000 cm ^{3}\) of gas \(X\) diffused through a porous plug in \(17.32\) seconds. An equal volume of nitrogen under the same conditions took 10 seconds to diffuse through the same porous plug. What is the relative molecular mass of \(X\) ? [N \(=14]\)

A. 16
B. 28
C. 42
D. 84

Question 1039:

In a nuclear transmutation, the nuclide \(234 X_{92}\) absorbs a neutron and two beta particles and emits two alpha particles to form another nuclide " \(Y_{ b }\), what are the respective values of \(a\) and \(b\) ?

A. 231 and 89
B. 227 and 86
C. 224 and 84
D. 222 and 88

Question 1040:

The radioactive emission that will produce fluorescence with anthracene but not with zinc sulphide is ____________

A. Beta particle
B. Gamma rays
C. Alpha particles
D. X-rays