Chemical Reactions and Equations

A substance which oxidises itself and reduces other is

known as -

• oxidising agent

• reducing agent

• both of these

• none of these

When hydrogen sulphide gas is passed through a blue

solution of copper sulphate, a black precipitate of

copper sulphide is obtained and the sulphuric acid so

formed remains in the solution. The reaction is an

example of-

• a combination reaction

• a displacement reaction

• a decomposition reaction

• a double displacement reaction

What happens when copper rod is dipped in iron

sulphate solution?

• Copper displaces iron

• Blue colour of copper sulphate solution is obtained

• No reaction takes place

• Reaction is exothermic

A balanced chemical equation is in accordance with-

• Avogadro’s law

• law of multiple proportion

• law of conservation of mass

• law of gaseous volumes

A redox reaction is one in which-

• both the substance are reduced

• both the substance are oxidised

• an acid is neutralised by the base

• one substance is oxidised while the other is reduced

Answer The question asked in image.

• a catalyst

• an oxidising agent

• a reducing agent

• a dehydrating agent

• (a)

• (b)

• (c)

• (d)

A reddish brown coloured metal used in electric wires,

when powdered and heated strongly in an open China

dish, its colour turns black. When hydrogen gas is

passed over this black substances, it regain its original

colour. Based on this information, the metal and black

coloured substances are

• copper and copper nitrate

• silver and silver oxide

• copper and copper oxide

• aluminium and aluminium oxide

• It is a decomposition reaction and endothermic in

  nature.

• It is a combination reaction.

• It is a decomposition reaction and accompanied

  by the release of heat.

• It is a photochemical decomposition reaction and

  exothermic in nature.

True or False: Neutralization reaction is a type of Double Displacement Reaction.

• True

• False