Chemistry MCQ -10

Q: One mole samples of each of the solid carbonates of lead, calcium, barium and magnesium are reacted in turn with excess dilute sulfuric acid.

• A barium

• B calcium

• C lead

• D magnesium

Q Amino acids are essential building blocks in the human body. Macromolecules in food are hydrolyzed to form amino acids. Which macromolecules provide the body with amino acids?

• A carbohydrates
• B fats
• C proteins
• D sugars

Q:Which statement about the isotopes of bromine is correct? They are atoms with the same number of

• A electrons and a different number of protons.
• B neutrons and the same number of electrons.
• C protons and the same chemical properties.
• D protons and the same physical properties

Q: Oil floats on water. Which statement is not true of oil and water?

• A Oil and water are immiscible.
• B Oil is less dense than water.
• C Some molecules in oil have a higher relative molecular mass than water.
• D The type of bonding within water molecules is different from the type of bonding within molecules in oil.

Q: Copper is purified by electrolysis. Which statement is not correct?

• A Both electrodes contain copper.
• B Copper is both oxidised and reduced in the process.
• C Pure copper is deposited on the positive electrode.
• D The electrolyte is aqueous copper(II) sulfate.

Q: Compound Z is made from element X and element Y. Compound Z is a good conductor of electricity when molten but not when solid. Which statement is correct?

• A Compound Z has strong forces of attraction between electrons and positive ions.
• B Compound Z has strong forces of attraction between negative ions and positive ions.
• C Elements X and Y are both metals.
• D Elements X and Y are both non-metals.

Q:How can alkenes be manufactured?

• A by polymerisation reactions
• B by the addition of hydrogen to unsaturated vegetable oils
• C by the combustion of alkanes
• D by the cracking of hydrocarbons

Q:

• A Ethene is a liquid at room temperature and pressure.
• B Liquid ethene conducts electricity.
• C One ethene molecule contains sixteen protons.
• D The total number of shared pairs of electrons in ethene is five.

Q:Concentrated aqueous sodium chloride is electrolyzed using inert electrodes until no more chlorine gas is evolved. What could be the pH of the resulting solution?

• A 1
• B 4
• C 7
• D 11

Q: Which statement shows that graphite and diamond are different forms of the element carbon?

• A Both graphite and diamond have giant molecular structures.
• B Complete combustion of equal masses of graphite and diamond produces equal masses of carbon dioxide and no other products.
• C Graphite and diamond have different melting points.
• D Graphite conducts electricity, whereas diamond does not.