Q1:
Question for Assertion & Reason Type Questions: Metals and Non-metals
Try yourself: Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion (A): When a piece of copper metal is added to dilute sulphuric acid, the solution turns blue.
Reason (R): Copper reacts with dilute sulphuric acid to form blue copper (II) sulphate solution.
Explanation
When a piece of copper metal is added to dilute sulphuric acid, the solution turns blue. It is because copper reacts with dilute sulphuric acid to form blue copper (II) sulphate solution.
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Q2:
Question for Assertion & Reason Type Questions: Metals and Non-metals
Try yourself: Assertion (A): Metals are sonorous.Reason (R): They are generally brittle in the solid state; they break into pieces when hammered.
Explanation
Metals are sonorous, malleable and ductile while non-metals are brittle.
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Q3:
Question for Assertion & Reason Type Questions: Metals and Non-metals
Try yourself: Assertion (A): Gas bubbles are observed when sodium carbonate is added to dilute hydrochloric acid.Reason (R): Carbon dioxide is given off in the reaction.
Explanation
Gas bubbles are observed when sodium carbonate is added to dilute hydrochloric acid as CO2 gas is released.
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Q4:
Question for Assertion & Reason Type Questions: Metals and Non-metals
Try yourself: Directions: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion (A): In alumino thermite process, the metals like iron melts due to the heat evolved in the reaction.
Reason (R): The reaction is:
Fe2O3 + 2Al → Al2O3 + 2Fe
Explanation
Large amount of heat is evolved which melts iron and can be used for welding.
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Q5:
Question for Assertion & Reason Type Questions: Metals and Non-metals
Try yourself: Assertion (A): Usually the sulphide ore is converted to oxide before reduction.Reason (R): Reduction of oxides occurs easier.
Explanation
Usually the sulphide ore is converted to oxide before reduction as oxides are easier to reduce.
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Q6:
Question for Assertion & Reason Type Questions: Metals and Non-metals
Try yourself: Assertion (A): A mineral is called ore, when metal is extracted from it conveniently and economically.Reason (R): All ores are minerals but all minerals are not ores.
Explanation
Minerals are naturally occurring chemical substances in the earth’s crust obtained by mining. But a mineral is called an ore only when the metal can be extracted from it conveniently and economically. Thus, all ores are minerals but all minerals are not ores.
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Q7:
Question for Assertion & Reason Type Questions: Metals and Non-metals
Try yourself: Assertion (A): While the extraction of copper, one of the steps involved isCu2S + 2Cu2 O → 6Cu + SO2
Reason (R): In this reaction Cu2S is the reducing agent whereas Cu2O is the oxidising agent.
Explanation
The Cu2+ ion in both the compounds gets reduced while sulphur gets oxidised.
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Q8:
Question for Assertion & Reason Type Questions: Metals and Non-metals
Try yourself:Assertion (A): In the metallurgy of Al, purified Al2O3 is mixed with Na3AlF6 or CaF2.
Reason (R): It lowers the melting point of the mixture and brings conductivity.
Explanation
In the metallurgy of aluminium, purified Al2O3 is mixed with Na3AlF6 or CaF2 which lowers the melting point of the mixture and brings conductivity.
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Q9:
Question for Assertion & Reason Type Questions: Metals and Non-metals
Try yourself: Direction: In the following questions, a statement of assertion (A) is followed by a statement of reason (R). Mark the correct choice as:Assertion: Different metals have different reactivities with water and dilute acids.
Reason: Reactivity of a metal depends on its position in the reactivity series.
Explanation
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A). The metals placed at the top of the series are most reactive.
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Q10:
Question for Assertion & Reason Type Questions: Metals and Non-metals
Try yourself: Assertion : Gas bubbles are observed when sodium carbonate is added to dilute hydrochloric acidReason : Carbon dioxide is given off in the reaction.
Explanation
Gas bubbles are observed when sodium carbonate is added to dilute hydrochloric acid as CO2 gas is released.
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Q11:
Question for Assertion & Reason Type Questions: Metals and Non-metals
Try yourself:Assertion: Metals have the quality of reflecting light from their surface and can be polished.
Reason: Non-metals are not usually lustrous.
Explanation
Metals have the quality of reflecting light from their surface and can be polished e.g., gold, silver, and copper.
Non-metals are usually not lustrous, except iodine and diamond - the most lustrous of all the substances.
But the reason is not the correct explanation of assertion.
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Q12:
Question for Assertion & Reason Type Questions: Metals and Non-metals
Try yourself: Assertion : Usually the sulphide ore is converted to oxide before reduction.Reason : Reduction of oxides occurs easier.
Explanation
Both assertion (A) and reason (R) are true explanations of assertion (A). Usually the sulphide ore is converted to oxide before reduction as oxides are easier to reduce.
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Q13:
Question for Assertion & Reason Type Questions: Metals and Non-metals
Try yourself: Assertion : Iron pyrite is not useful in the extraction of Fe.Reason : SO2 polluting gas is produced during extraction.
Explanation
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A). Pyrite is composed of iron and sulphur. The sulphur content during extraction may contaminate the metal and reduce the strength.
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Q14:
Question for Assertion & Reason Type Questions: Metals and Non-metals
Try yourself: Assertion : Zinc carbonate is heated strongly in the presence of air to form zinc oxide and carbon dioxide.Reason : Calcination is the process in which a carbonate ore is heated strongly in the absence of air to convert into metal oxide.
Explanation
Assertion (A) is false but reason (R) is true.
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Q15:
Question for Assertion & Reason Type Questions: Metals and Non-metals
Try yourself: Assertion : In the metallurgy of Al, purified Al2O3 is mixed with Na3AlF6 or CaF2.Reason : It lowers the melting point of the mixture and brings conductivity.
Explanation
Both assertion (A) and reason (R) are true and reason explanation of assertion (A). In the metallurgy of aluminium, purified Al2O3 is mixed with Na3AlF3 or CaF2 which lowers the melting point of the mix and brings conductivity.
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Q16:
Question for Assertion & Reason Type Questions: Metals and Non-metals
Try yourself: Assertion : Gold is isolated from other impurities by the Arndt forrest cyanide process.Reason : The cyanide which is used here dissolve all possible impurities.
Explanation
Assertion (A) is true but reason (R) is false. The cyanide dissolves gold by forming a complex.
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Q17:
Question for Assertion & Reason Type Questions: Metals and Non-metals
Try yourself: Assertion : Magnesium chloride is an ionic compound.Reason : Metals and non-metals react by mutual transfer of electrons.
Explanation
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
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Q18:
Question for Assertion & Reason Type Questions: Metals and Non-metals
Try yourself: Assertion : Zinc can easily displace Copper on reacting with a solution of copper sulphate.Reason : Copper is more reactive metal as compared to Zinc.
Explanation
Assertion (A) is true but reason (R) is false.
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Q19:
Question for Assertion & Reason Type Questions: Metals and Non-metals
Try yourself: Assertion : Zinc oxide amphoteric in nature.Reason : Zinc oxide reacts with both acids and bases.
Explanation
Both assertion (A) and reason (R) are true and reason (R) is the correct explanation of assertion (A).
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Q20:
Question for Assertion & Reason Type Questions: Metals and Non-metals
Try yourself:Assertion : Bronze is an alloy of lead and tin.
Reason : Alloys are a heterogeneous mixture of metals with other metals and non-metals.
Explanation
Assertion (A) is true but reason (R) is false.
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