Chemical reactions and equations session - 1

Chemistry reactions and equations

CHEMICAL REACTION

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Multiple Choice

Which of the following is not a physical change?

• Boiling of water to give water vapour
• Melting of ice to give water
• Dissolution of salt in water
• Combustion of Liquefied Petroleum Gas (LPG)

Multiple Choice

Which of the following are exothermic processes? (i) Reaction of water with quick lime (ii) Dilution of an acid(iii) Evaporation of water (iv) Sublimation of camphor (crystals)

• (i) and (ii)
• (ii) and (iii)
• (i) and (iv)
• (iii) and (iv)

Multiple Choice

A chemical reaction does not involve:

• Formation of new substances having entirely different properties than that of the reactants

• Breaking of old chemical bonds and formation of new chemical bonds

• Rearrangement of the atoms of reactants to form new products

• Changing of the atoms of on element into those of another element to form new products

Multiple Choice

One of the following processes does not involve a chemical reaction. That is:

• Melting of candle wax when heated

• Burning of candle wax when heated

• Digestion of food in our stomach

• Ripening of banana

Multiple Choice

It is necessary to balance a chemical equation in order to satisfy the law of:

• Conservation of motion

• Conservation of momentum

• Conservation of energy

• Conservation of mass

Multiple Choice

The neutralization reaction between an acid and a base is a type of:

• Double displacement reaction

• Displacement reaction

• Addition reaction

• Decomposition reaction

Multiple Choice

What happens when copper rod is dipped in iron sulphate solution :-

• Copper displaces iron

• Blue color of copper sulphate solution is obtained

• No reaction takes place

• Reaction is exothermic