Post Utme Chemistry Past Questions and Answers

Question 806:

The pOHiofa solution ofo. \(25 mol dm -3\) of hydrochloric acid is ____________

A. \(12.40\)
B. \(13.40\)
C. \(14.40\)
D. \(14.60\)

Question 807:

\(MnO _{-4}, 8 H + Y\) - \(Mn 1( q +4 H , O 0 Y\) in the equation represents ____________

A. 2e-
B. 3e-
C. Se-
D. 7e-

Question 808:

Given that \(M\) is the mass of substance deposited in an electrolysis and \(Q\) the quantity of electricity consumed, then ffaraday's law can be written as ____________

A. ZIQ
B. Q/Z
C. Z/2Q
D. M=QZ

Question 809:

\(0.46 g\) of ethanol when burned raised the temperature of \(50 g\) of water by \(14.3 k\). Calculate the heat of combustion of ethapol.
\(mol =12,0=16, H =1\), Specific heat capacity of water='4.2 \(Jg\) ' \(K\)

A. \(+33000 KJ mol\)
B. \(+300 KJ\) mol\)
C. \(-3000 KJmol\)
D. \(-3000 KJ\)

Question 810:

Powered marble reacts faster with hydrochloric acid solution than the granular form because the powered form has ____________

A. More molecules
B. More atom
C. Larger surface area
D. Relatively large mass