Chemistry Quiz

Which of the following oxides of iron would be obtained on the prolonged reaction of iron with steam?

• FeO

• Fe2O3

• Fe3O4

• Fe2O3 and Fe3O4

A non-metal used to preserve food material is:

• Carbon

• Phosphorus

• Sulphur

• Nitrogen

The arrangement for Copper, Tin, Lead and Mercury, according to the reactivity series, is:

• Tin> Lead> Copper> Mercury

• Lead> Copper> Mercury> Tin

• Copper> Mercury> Tin> Lead

• Mercury> Tin> Lead> Copper

The metals that float when treated with water are:

• Manganese and sodium

• Sodium and calcium

• Magnesium and sodium

• Magnesium and calcium

Aluminium is used for making cooking utensils. Which of the following properties of aluminium are responsible for the same?

• (i) and (ii)

• (i) and (iii)

• (ii) and (iii)

• (i) and (iv)

When hydrochloric acid is added to barium hydroxide, a white-coloured compound is formed. Which of the following option gives the complete chemical reaction?

• HCl + Ba(OH)2 → BaCl2 + 2HOH

• 2HCl + Ba(OH)2 → BaCl2 + 2HOH

• 2HCl + Ba(OH)2 → BaH2 + 2HCl + O2

• HCl + 2Ba(OH) → 2BaCl2 + 2HOH + O2

What happens when a pellet of sodium is dropped in water?

• It catches fire and forms oxide

• It absorbs heat and forms oxide

• It catches fire and forms hydroxide

• It absorbs heat and forms hydroxide

The chemical reaction between a piece of copper and nitric acid is given by the chemical equations, Cu + HNO3 → Cu(NO3)2 + H2 H2 + HNO3 → H2O + NO2 What can be inferred from the chemical equation?

• Copper causes the oxidation of HNO3 to form NO2

• Hydrogen gas gets oxidised by HNO3 to form water

• Gas reacts with oxygen in the air to form water

• Nitrate reacts with hydrogen to form NO2 and H2O

Which of the following options gives the process of extraction of mercury from its ore cinnabar?

• Cooling cinnabar in the presence of excess air

• Cooling cinnabar to convert it into mercuric oxide and then heating it

• Cinnabar to convert it into mercuric oxide and then heating it again

• Cinnabar in the presence of limited air, and then adding a small amount of water

The image shows the electrolytic refining of copper. Which of the following options explains the process of obtaining pure copper?

• When current is passed, pure copper from the anode deposits to the cathode.

• When current is passed, pure copper from the anode deposits in the electrolytic solution.

• When current is passed, pure copper from the electrolytic solution deposits at the anode.

• When current is passed, pure copper from the electrolytic solution deposits at the cathode.