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Q:

Magnetite is an ore/mineral of

A) Beryllium B) Chromium
C) Iron D) Lead
 
Answer & Explanation Answer: C) Iron

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Q:

What happens as we go down the group in the periodic table?

A) The number of shells decreases B) Valence electrons decreases
C) The number of shells increases D) Atomic size decreases
 
Answer & Explanation Answer: C) The number of shells increases

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Q:

Nitric acid does not react with

A) Gold B) Copper
C) Zinc D) Iron
 
Answer & Explanation Answer: A) Gold

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Q:

Which is known as carbolic acid?

A) Phenol B) Ethanol
C) Acetic acid D) Oxalic acid
 
Answer & Explanation Answer: A) Phenol

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Q:

Which of the following elements has the lowest melting point?

A) Sodium B) Tin
C) Radon D) Radium
 
Answer & Explanation Answer: C) Radon

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Q:

Which of the following statement(s) is/are INCORRECT regarding Phosphorus?

A) Phosphorus reacts vigorously with water B) It is a non-metal
C) It catches fire on reacting with air D) It is found in group 15 of the modern periodic table
 
Answer & Explanation Answer: A) Phosphorus reacts vigorously with water

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Q:

___________ gases absorb long wave (infrared) radiation from the earth and emit it again towards the earth.

A) Methane B) Greenhouse
C) Carbon dioxide D) Ozone
 
Answer & Explanation Answer: B) Greenhouse

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Q:

Which of the following gases is produced due to incomplete combustion of fuel?

A) Carbon Dioxide B) Carbon Monoxide
C) Methane D) Ethane
 
Answer & Explanation Answer: B) Carbon Monoxide

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