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Question

Which substance changes the rate of chemical reactions and remains chemically different during reaction?

This question was previously asked in
RPF SI 2018 Question Paper PDF (10-Jan-2019) (Shift 1)
The correct answer is

Trigger

The stem is a translation from Hindi: "Trigger" stands for utprerak, which means catalyst, and "remains chemically different" means the substance remains chemically unchanged at the end of the reaction.

A catalyst changes the rate of a chemical reaction, usually speeding it up by offering a path with lower activation energy, and is recovered unchanged in mass and chemical composition after the reaction. For example, iron is the catalyst in the Haber process.

A reactant ("Reactor") is used up and changed during the reaction, and a solvent only dissolves the substances without controlling the rate in this way.

Hence, the substance described is a catalyst, given here as Trigger.

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