Assertion: Chemical equations should be balanced.
Reason: As per the law of conservation of mass, mass can neither be created nor be destroyed.
Both assertion and reason are correct and reason is the correct explanation of assertion.
Both assertion and reason are correct, but reason is not the correct explanation of assertion.
Assertion is true, but reason is false.
Assertion is false, but reason is true.
(1)
The chemical equations should be balanced because, as per the law of conservation of mass, “mass can neither be created nor be destroyed”. Therefore, the number of atoms on both sides of the equations should be equal.
Assertion: Colour of copper sulphate solution changes when an iron nail is kept immersed in it.
Reason: The colour of copper sulphate solution changes due to the decomposition reaction taking place between iron and copper, leading to formation of iron sulphate.
Both assertion and reason are correct and reason is the correct explanation of assertion.
Both assertion and reason are correct, but reason is not the correct explanation of assertion.
Assertion is true, but reason is false.
Assertion is false, but reason is true.
(3)
The colour changes due to a displacement reaction, not decomposition. Iron displaces copper from copper sulphate solution, forming iron sulphate.
Assertion: Photosynthesis is considered as an exothermic reaction.
Reason: Photosynthesis is an endothermic reaction because sunlight energy is absorbed by green plants during this process.
Both assertion and reason are correct and reason is the correct explanation of assertion.
Both assertion and reason are correct, but reason is not the correct explanation of assertion.
Assertion is true, but reason is false.
Assertion is false, but reason is true
(4)
Photosynthesis is an endothermic reaction because it requires absorption of sunlight energy.
Assertion: Silver articles become black after some time when exposed to sunlight.
Reason: It is because silver reacts with carbonates present in the air.
Both assertion and reason are correct and reason is the correct explanation of assertion
Both assertion and reason are correct, but reason is not the correct explanation of assertion.
Assertion is true, but reason is false.
Assertion is false, but reason is true.
(3)
Silver reacts with sulphur in the air forming silver sulphide, which causes blackening (tarnishing).
Assertion: Hydrogen peroxide is kept in coloured bottles.
Reason: Hydrogen peroxide is a moderately reactive metal that can react with light or heat slowly to produce water.
Both assertion and reason are correct and reason is the correct explanation of assertion.
Both assertion and reason are correct, but reason is not the correct explanation of assertion.
Assertion is true, but reason is false.
Assertion is false, but reason is true
(3)
Hydrogen peroxide is not a metal, it is a compound. It decomposes into water and oxygen in the presence of sunlight or heat. To prevent this, it is kept in coloured bottles.
Assertion: Silver bromide is kept in coloured bottles.
Reason: It is because it decomposes in presence of light.
Both assertion and reason are correct and reason is the correct explanation of assertion.
Both assertion and reason are correct, but reason is not the correct explanation of assertion.
Assertion is true, but reason is false.
Assertion is false, but reason is true
(1)
Silver bromide decomposes in presence of light, so it is stored in coloured bottles to avoid decomposition.
Assertion: Hydrogen is not included in the activity series of metals.
Reason: It is because it can lose electrons to form positive ions.
Both assertion and reason are correct and reason is the correct explanation of assertion.
Both assertion and reason are correct, but reason is not the correct explanation of assertion
Assertion is true, but reason is false.
Assertion is false, but reason is true.
(4)
Hydrogen is included in activity series of metals because like metals, hydrogen can also lose electrons to form positive ions. Thus, assertion is false but reason is true.
Assertion: Copper vessels get covered with green coating in rainy season.
Reason: It is because of the formation of copper carbonate.
Both assertion and reason are correct and reason is the correct explanation of assertion.
Both assertion and reason are correct, but reason is not the correct explanation of assertion.
Assertion is true, but reason is false.
Assertion is false, but reason is true.
(1)
Copper vessels get covered with a green coating in the rainy season because when copper is exposed to air in rainy season, the metal reacts with moisture and atmospheric gases to form basic copper carbonate.
Assertion: Paint is applied on the iron articles.
Reason: To protect them from rain.
Both assertion and reason are correct and reason is the correct explanation of assertion.
Both assertion and reason are correct, but reason is not the correct explanation of assertion.
Assertion is true, but reason is false.
Assertion is false, but reason is true
(3)
Iron articles are painted to prevent them from rusting, not just rain. Thus, assertion is true but reason is false.
