Advertisements
Advertisements
Question
Which of the following is not a physical change?
Options
Boiling of water to give water vapour
Melting of ice to give water
Dissolution of salt in water
Combustion of Liquefied Petroleum Gas (LPG)
Advertisements
Solution
Combustion of Liquefied Petroleum Gas (LPG)
Explanation -
Boiling of water to give water vapour, melting of ice to give water and dissolution of salt in water are all examples of physical change, as in any of the three processes there is only change in state and the chemical composition of the compound is not changing. Whereas when liquified petroleum gas is burnt in air, it is actually undergoing a chemical reaction with oxygen gas present in the air and as a result of which two new products water and carbon dioxide are formed. Therefore, option 4 is an example of chemical change.
APPEARS IN
RELATED QUESTIONS
Balance the given equation:
HNO3 + Ca(OH)2 
Ca(NO3)2 + H2O
Balance the given equation:
BaCI2 + H2SO4 
BaSO4 + HCI
Balance the given chemical equation:
NH3 → N2 + H2
With the help of an appropriate example, justify that some of the chemical reactions are determined by Change in temperature.
Give chemical equation for the reaction involved in the above case.
Give one example of an endothermic reaction.
Which of the following does not involve a chemical reaction?
What is a chemical equation?
Dry raisins were soaked in water for 2 hours, to determine the percentage of water absorbed by raisins. Before final weighing of swollen raisins, the extra water left on the surface of soaked raisins was removed by:
Write the balanced chemical equation of the following reaction.
potassium bicarbonate + sulphuric acid → potassium sulphate + carbon dioxide + water
Write the balanced chemical equation of the following reaction. iron + sulphuric acid → ferrous sulphate + hydrogen.
Write the balanced chemical equation of the following reaction.
barium chloride + sulphuric acid → barium sulphate + hydrochloric acid
Write the balanced chemical equation of the following reaction.
iron pyrites(FeS2) + oxygen → ferric oxide + sulphur dioxide
1 g of copper powder was taken in a China dish and heated. What change takes place on heating? When hydrogen gas is passed over this heated substance, a visible change is seen in it. Give the chemical equations of reactions, the name and the color of the products formed in each case.
Write word equation for the following chemical reaction given below. Also state the observation seen in the case.
NaCl + AgNo3 → AgCU ↓ + NaN03
Give an example of a chemical equation in which two reactants form:
one product
Balance the following simple equation:
N2 + O2 ⇌ NO
Balance the following simple equation:
Al + O2 → Al2O3
Balance the following simple equation:
H2 + Cl2 → HCl
Write a balanced equation for the following word equation:
Nitrogen dioxide + Water + Oxygen → Nitric acid
Balance the following chemical equation.
- Na + O2 → Na2O3
- Ca + N2 → Ca3N2
- N2 + H2 →NH3
- CaCO3 +HCl → CaCl2 + CO2 +H2O
- Pb(NO3)2 → PbO + NO2 + O2
