Question : Which of the following is colourless?
Option 1: Chlorine
Option 2: Oxygen
Option 3: Phosphorus
Option 4: Sulphur
Correct Answer: Oxygen
Solution : The correct option is Oxygen.
Oxygen is said to be colourless in its elemental state. Composed of two linked oxygen atoms, oxygen gas (O2) is typically colourless and transparent. We inhale oxygen when we breathe, and the air we breathe looks colourless to our eyes.
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Question : Ozone consists of which of the following?
Option 1: Oxygen only
Option 2: Oxygen and Nitrogen
Option 3: Hydrogen and Carbon
Option 4: Oxygen and Carbon
Question : Which of the following elements is obtained from seaweeds?
Option 1: Iodine
Option 2: Vanadium
Option 3: Argon
Question : The black soil of the Deccan Plateau lacks which of the following minerals?
Option 1: Phosphorus
Option 2: Potash
Option 3: Iron
Option 4: Lime
Question : Which of the following is widely used in making semiconductor chips?
Option 1: Radium
Option 2: Sodium
Option 3: Germanium
Question : Which among the following is used in fire extinguishers?
I. carbon dioxide
II. oxygen
III. sulphur dioxide
Option 1: Only I
Option 2: Only II
Option 3: Only III
Option 4: All options are correct.
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