UNIPORT Chemistry 2018/2019 Past Questions

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

Which of the following compounds is not aromatic?

A.Benzene
B.Cyclohexane
C.Anthracene
D.Naphthalene

If an element has the electronic configuration 1s²2s²2p⁶3s²3p⁴ It is:

A.A non-metal
B.An Alkaline-earth metal
C.An S-block element
D.a p-block element

Which of the following is true?

A.Standard enthalpy change of combustion is the enthalpy change when two moles a substance is completely ashed in nitrogen
B.Standard enthalpy change of combustion is the enthalpy change when one mole of the substance. is burnt completely in oxygen under standard conditions
C. Standard enthalpy change of combustion is the enthalpy change when one mole of oxygen and methane are liquefied in Nitrogen under standard conditions
D.Standard enthalpy change of combustion is enthalpy change when one mole of oxygen reacts endothermically with other substances under standard conditions

Cu_(s) + HNO_3(l) → Cu(NO₃)_2(l) + H₂O_(l) + 2NO_2(g) .
In the above reaction, nitric acid is acting as:

A.an oxidizing agent
B.a reducing agent
C.a nitrating agent
D.a hydrating agent

The following are metals except

A.silicon
B.tin
C.lead
D.chromium

Water was added to sodium dioxonitrate (V) salt in a test tube and the test tube became cold. The reaction is

A.Reversible
B.Exothermic
C.endothermic
D.explosive

A gas occupying an initial volume of 2dm³ is heated and allowed to expand to 6dm³ at constant pressure. The ration of the initial absolute temperature to the final absolute temperature is

A.3:1
B.1:3
C.2:1
D.1:2

Calculate the quantity of electricity required to deposit 64.0 g of copper from copper (II) chloride (Cu=64, 1F = 96500C)

A.3.09 × 10⁶C
B.1.93 × 10⁵C
C.9.65 × 10⁴C
D.6.18 × 10⁶C

Given the reaction at equilibrium: N₂(g) + O₂(g) 2NO(g) as the concentration of N₂(g) increases, the concentration of O₂(g) will

A.decrease
B.increase
C.remains the same
D.vanishes
E.pours away

Citrus fruits such as lemon and grape taste sour because they contain

A.ascorbic acid and citric acid
B.citric acid and ascetic acid
C.citric acid and dilute HCI
D.citric acid and salicyclic acid
E.Sulphuric acid