Chemistry

Chemical Reactions and Equations

596+ practice questions available

Sample Practice Questions

5 questions shown — tap “Show Answer” to check yours.

Easy

Activity 1.6: While heating lead nitrate, why is it recommended to hold the boiling tube with a pair of tongs and point it away from yourself?

ABecause the tube might explode

BTo avoid inhaling the toxic brown fumes of nitrogen dioxide

CTo prevent the solid from falling out

DBecause the flame is too hot

Hard

What is the observation when a student heats a small amount of copper nitrate in a boiling tube?

AWhite fumes are evolved

BBrown fumes are evolved

CNo gas is evolved

DA popping sound is heard

Easy

Case Study (Continued): Electrolysis of Water Question 5: The chemical reaction for the electrolysis of water is:

A\( H_2O \rightarrow H_2 + O_2 \)

B\( 2H_2O \rightarrow 2H_2 + O_2 \)

C\( H_2O_2 \rightarrow H_2O + O \)

D\( 2H_2 + O_2 \rightarrow 2H_2O \)

Medium

Balance the following equation and find the sum of coefficients of the products: \[ BaCl_2 + H_2SO_4 \rightarrow BaSO_4 + HCl \]

Easy

Which of the following conditions is NOT required for the rusting of iron?

APresence of Oxygen

BPresence of Moisture

CPresence of Sunlight

DContact with the metal surface

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