UNICAL Chemistry 2021/2022 Past Questions

Practice each question, then open it to see the full details.

The atoms of 6C₁₃ and 7N₁₄ are considered as __________

A.Isotopes
B.Isomers
C.Isobars
D.Isotones

Atomicity of Phosphorous is _________

A.2
B.3
C.4
D.5

The saturation temperature for 20.7g of CuSO₄ soluble in water is_______

A.100C
B.1000C
C.200C
D.300C

The solubility level of an aqueous solution of NaCl at 250C is ________

A.20g
B.36g
C.95g
D.8g

The increase in the solubility of Sodium halides, in water at 250C is________

A.NaCl >NaBr> Nal
B.NaBr > Nal > NaCl
C.Nal > NaBr > NaCl
D.NaCl = NaBr > Nal

What is the oxidation number of sulphur in FeS₄O?

A.-4
B.-2
C.+4
D.+6

Which of the following is discharged at the cathode during the electrolysis of brine using platinum electrode?

A.H₂(g)
B.Na(g)
C.Cl₂(g)
D.OH-(g)

What mass of Cu would be produced by the cathodic reduction of Cu²⁺ when 1.60A of current passes through a solution of CuSO₄ for 1 hour?[F = 96500Cmol^-1, Cu = 64]

A.7.64g
B.3.82g
C.1.91g
D.0.96g

An example of an endothermic reaction is the dissolution of

A.NaOH(s) in water
B.NH₄ (s) in water
C.CuSO₄ (s) in water
D.Ca(OH)₂ (s) in water

The situation obtained when a perfect gas expands into a vacuum is

A.ΔH is positive and TΔS is zero
B.ΔH is positive and TΔS is negative
C.ΔH is negative and TΔS is zero
D.ΔH is zero and TΔS is positive