UNIZIK Chemistry 2019/2020 - Model Past Questions

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

Ethanol reacts with concentrated tetraoxosulphate(VI) acid at a temperature above 170°C to form

A.ethanoate
B.ethene
C.ethyne
D.ethanal

When water boilers are used for a long period of time, the solid substances left behind as scale are

A.magne-sium trioxosilicate (IV) and trust
B.magnesium trioxosilicate (IV) and calcium tetraoxosulphate (VI)
C.clay and magnesium trioxosilicate (IV)
D.clay and rust

A ketone reacts with hydroxylamine to give

A.a hydrazone
B.an alkanonitrile
C.a nitroso compound
D.anoxime

If a reaction is exothermic and there is a great disorder, it means that

A.The reaction is in a state of equilibrium
B.There will be a large increase in free energy
C.There will be a large decrease in free energy
D.The reaction is static

The furring of kettles is caused by the presence in water of .............

A.calcium trioxocarbonate (IV)
B.calcium tetraoxosulphate (VI)
C.calcium hydroxide
D.calcium hydrogentrioxocarbonate (IV)

If 3 moles of electrons are required to deposit 1 mole of a metal M during the electrolysis of its molten chloride, the empirical formula of the metallic chloride is

A.M₃Cl
B.M₃Cl
C.MCl
D.M₂Cl₃
E.MCl₃

In any chemical reaction, the total mass of the products is always equal to that of the reactants. This is statement of the law of

A.definite proportions
B.conservation of matter
C.multiple proportions
D.constant composition

Zinc oxide is a

A.Basic oxide
B.Acidic oxide
C.Amphoteric oxide
D.Neutral oxide.

Compounds that have the same molecule formula but different structures are said to be

A.allotropic
B.isotopic
C.polymeric
D.isomeric

Calculate the mass of ZnSO₄ produced when excess ZnCO₃ is added to 50.00cm³ of 4.00 H₂So₄. The equation for the reaction is: ZnCo₃ + H₂SO₄ → ZnSO₄ + CO₂ + H₂O [ZnSO₄ = 161g/mol]

A.0.20g
B.32.2g
C.1.29g
D.39.0g