Question

d. The insoluble solid left on the filter paper during filtration.
e. An instrument used to measure humidity.​

Answer 1

1. residue
2. hygrometer

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Answer 2

d.Filtration can be used to separate an insoluble solid from a liquid, or a precipitate from the reaction mixture in which it formed. The solid which collects in the filter paper is called the residue. The clear liquid which passes through the filter paper is called the filtrate.

e.A relative humidity meter, also referred to as a humidity detector or humidity gauge, is a device with a humidity sensor that measures the relative humidity in the air.