Chemistry MCQs
Practice free Chemistry multiple-choice questions with instant answer feedback and step-by-step solutions. Click an option to check yourself, reveal the full explanation, and work through all 1238 questions — no login required.
Question 307hard
Browning of paper in old books is caused by
Question 308hard
Catalyst is a substance which
Question 309hard
When quick lime is added to water
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Question 310hard
What is the element that is in the highest percentage in the composition of the earth ?
Question 311hard
Which among the following is used to dilute oxygen in the gas cylinders used by divers ?
Question 312medium
Which one element from below list is liquid at room temperature?
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Question 313easy
Which among the following elements is found in maximum percentage in the human body ?
Question 314hard
Iodine can be separated from a mixture of Iodine and Potassium Chloride by
Question 315hard
The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing is: