On recrystallization, 20g of magnesium tetraoxosuphate (IV) forms 41 g of magnesium tetraoxosulphate (IV) crystals, MgSO4. yH2O. The value of y is? (Mg = 24, S = 32, O = 16, H = 1)

• A. 1
• B. 3
• C. 5
• D. 7

The following glasswares are used to measure the volume of liquids EXCEPT

• A. graduated beaker
• B. pipette
• C. test tube
• D. burette

How many hydrogen atoms does a single ring cycloalkane have less than the corresponding open-chain alkane?

• A. Two
• B. Three
• C. Four
• D. One

Which of the following can be obtained by fractional distillation?

• A. Nitrogen from liquid air
• B. Sodium Chloride from sea water
• C. Iodine from solution of Iodine in carbon tetrachloride
• D. Sulphur from the solution of sulphur in carbon disulphide

The compound that makes palm wine taste sour after exposure to the air for few days is

• A. Ethanol
• B. Ethanoic acid
• C. Methanol
• D. Methanoic acid

Which of the following pairs of elements forms amphoteric oxides?

• A. Be and Mg
• B. Na and K
• C. B and Al
• D. Si and Pb

Which of the following gases dissolves in water vapour to produce acid rain during rainfall?

• A) oxygen
• B) carbon (II) oxide
• C) nitrogen
• D) sulphur (IV) oxide

What is the name of the gas liberated when diluted hydrochloric acid is added to iron(ii)sulphide?

• A. turns lime water milky
• B. decolorizes bromine water
• C. gives a pop sound
• D. turns lead(ii)ethanoate paper black

When element₂₀Y combines with element₈Z, it forms

• A. A covalent compound , YZ is formed
• B. A covalent compound, ZY is formed
• C. An ionic compound, YZ is formed
• D. An ionic compound, ZY is formed

An amphoteric oxide is an

• A) amorphorous oxide of a metal
• B) amorphorous oxide of a non-metal
• C) Oxide that is insoluble in water
• D) Oxide that behaves as a base as well as an acid