Language of Chemistry Class 7. We covered all the Language of Chemistry Class 7 MCQs in this post for free so that you can practice well for the exam.
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Language of Chemistry Class 7 Objective for Students
Tincture of iodine is an antiseptic for fresh wounds. It is a dilute solution of elemental iodine, which does not contain:
(a) Water.
(b) Acetone.
(c) Alcohol.
(d) Potassium iodide.
Option b – Acetone
Carborundum is used as an abrasive because it:
(a) Has high thermal conductivity.
(b) Has a low coefficient of expansion.
(c) Has high chemical stability.
(d) Is extremely hard.
Option d – Is extremely hard
‘Plum Pudding Model’ for an atom was proposed by:
(a) Antoine Lavoisier.
(b) Robert Boyle.
(c) Ernest Rutherford.
(d) J. J. Thomson.
Option d – J. J. Thomson
The paste of a white material in water is used to maintain a fractured bone fixed in place. The white material used is called:
(a) Bleaching powder.
(b) Plaster of Paris.
(c) Powder of zinc oxide.
(d) Lime powder.
Option b – Plaster of Paris
Which one of the following types of glasses is used for making optical instruments?
(a) Pyrex glass.
(b) Soft glass.
(c) Hard glass.
(d) Flint glass.
Option c – Hard glass
An emulsion consists of:
(a) One liquid and one solid.
(b) One liquid and one gas.
(c) Two liquids.
(d) Two solids.
Option c – Two liquids
The joule-Thomson process is extremely useful and economical for attaining low temperatures. The process can be categorized as:
(a) Isobaric process.
(b) Isoenthalpic process.
(c) Adiabatic process.
(d) Isochoric process.
Option c – Adiabatic process
The foul smell of urine of a healthy man having healthy food, when spilled on the floor, is mainly due to the bacterial decomposition of:
(a) Urea into sulfur dioxide.
(b) Sugar into carbon dioxide.
(c) Lipids into methane.
(d) Urea into ammonia.
Option d – Urea into ammonia
Which one of the following polymers does not contain glucose units?
(a) Glycogen.
(b) Starch.
(c) Cellulose.
(d) Rubber.
Option d – Rubber
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