PDF chapter test TRY NOW
1. Identify the changes involved in the following processes as physical or chemical changes.
(c) Heating of an iron rod to red hot.
Heating an iron rod to red hot is a change because there is no chemical change throughout the heating process. Hence, it is a change.
2. During the reaction of some metals with dilute hydrochloric acid, following observations were made.
Explain these observation giving suitable reason.
(c) The reaction of sodium metal is found to be highly explosive.
(c) The reaction of sodium metal is found to be highly explosive.
Sodium is a metal. It reacts violently / explosively with hydrochloric acid to form gas and release large amounts of heat.
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