Assertion & Reason Test: Metals & Non-metals - 1 - Class 10

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

Assertion (A): Usually the sulphide ore is converted to oxide before reduction.

Reason (R): Reduction of oxides occurs easier.

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.

Assertion (A): While the extraction of copper, one of the steps involved is

Cu₂S + 2Cu₂ O → 6Cu + SO₂

Reason (R): In this reaction Cu₂S is the reducing agent whereas Cu₂O is the oxidising agent.

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.

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.

Assertion : Gas bubbles are observed when sodium carbonate is added to dilute hydrochloric acid

Reason : Carbon dioxide is given off in the reaction.