Top 500+ TRB Chemistry Model Question Paper with Answers - 5

Question: 21

Vinegar is a dilute solution of

(A) Acetic acid

(B) Formic acid

(C) Ethyl alcohol

(D) Methyl alcohol

Question: 22

Silicon is used in

(A) Semiconductors

(B) Transistors

(C) Solar energy devices

(D) All of these

Question: 23

The property of an element existing in more than one form in the same physical state is called

(A) Allotropy

(B) Conductivity

(C) Ductility

(D) Malleability

Question: 24

The temperature of ____ is less than that of other layers below it.

(A) Thermosphere

(B) Troposphere

(C) Mesosphere

(D) Stratosphere

Question: 25

Which one of the following carboxylic acids is present in the sting of red ant?

(A) Acetic acid

(B) Butyric acid

(C) Formic acid

(D) Lactic acid