Pathfinder Chemistry. We covered all the Pathfinder Chemistry MCQs in this post for free so that you can practice well for the exam.
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Pathfinder Chemistry Objective for Students
Pure water can be obtained from seawater by
(a) centrifugation.
(b) plasmolysis.
(c) reverse osmosis.
(d) sedimentation.
Option c – reverse osmosis
Silver gets corroded due to ……… in the air.
(a) Oxygen.
(b) Hydrogen Sulphide.
(c) Carbon dioxide.
(d) Nitrogen.
Option b – Hydrogen Sulphide
Which one of the following non-metals shows allotropy in the liquid state?
(a) Carbon.
(b) Sulphur.
(c) Phosphorus.
(d) Bromine.
Option b – Sulphur
Nitric acid does not react with
(a) Gold.
(b) Copper.
(c) Zinc.
(d) Iron.
Option a – Gold
Fuel used for rocket propulsion is a mixture of
(a) hydrazine and hydrogen peroxide.
(b) hydrazine and TNT.
(c) hydroxylamine and TNT.
(d) hydroxylamine and hydrogen peroxide.
Option c – hydroxylamine and TNT
Which one of the following is not used as a fertilizer?
(a) Ammonium nitrate.
(b) Ammonium sulfide.
(c) Ammonium phosphate.
(d) Ammonium sulfate.
Option b – Ammonium sulfide
Phosphorus is kept in water because
(a) its ignition temperature is very high.
(b) its ignition temperature is very low.
(c) its critical temperature is high.
(d) its critical temperature is low.
Option b – its ignition temperature is very low
White phosphorus glows in the dark due to
(a) amorphous character.
(b) slow oxidation.
(c) high ignition temperature.
(d) the good conducting property of electricity.
Option b – slow oxidation
Red phosphorus is used in the manufacture of safety matches. This is due to the fact that
(a) it shows phosphorescence.
(b) at ordinary temperature, it is less reactive than other varieties of phosphorus.
(c) it cannot be converted to white phosphorus on heating.
(d) it does not react with halogens on heating.
Option a – it shows phosphorescence
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