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.
electrolyte
electrodes
salt bridge
solid - liquid interface
Correct answer is C
No explanation has been provided for this answer.
Consider the reaction: A + 2B(g)⇌ 2C + D(g) (ΔH = +ve)
What will be the effect of decrease in temperature on the reaction?
Rate of backward reaction will increase
The equilibrium constant will shift
Rates of forward and backward reactions are not affected
Rate of forward reaction will increase
Correct answer is A
The given reaction is endothermic, hence, a decrease in temperature will favor the exothermic side which is the backward reaction.
The following are isoelectronic ions except
Na+
Mg2+
Si2+
O2+
Correct answer is C
Two or more ions are said to be isoelectronic if they have the same electronic structure and the same number of valence electrons.
Na+ = 10 electrons = 2, 8
Mg2+ = 10 electrons = 2,8
O2− = 10 electrons = 2,8
Si2+ = 12 electrons = 2,8,2
⟹ Si2+ is not isoelectronic with the rest.
The hybridization in the compound CH3−CH2−C≡H is
sp3 and sp
sp
sp2
sp3 and sp2
Correct answer is A
The hybridization in a and b is sp3 hybridization while in c and d is sp hybridization.
Z3(SO4)2
ZSO4
Z2 SO4
Z2(SO4)3
Correct answer is D
Z = 1s2 2s2 2p6 3s2 3p1
∴ We have Z^{3+} and SO_4 ^{2-}
The reaction : Z^{3+} + SO_4 ^{2-} \to Z_2(SO_4)_3.