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Q:

Which of the following is not a Halon gas ?

A) methane B) Carbon tetra chloride
C) iodomethane D) bromomethane
 
Answer & Explanation Answer: A) methane

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Q:

Which of the following is the third member of the Dobereiner triad, that also features Lithium and Sodium?

 

A) Potassium B) Boron
C) Barium D) Hydrogen
 
Answer & Explanation Answer: A) Potassium

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Q:

Acetic Acid is another name for which of the following?

A) Vinegar B) Baking Soda
C) Copper Sulphate D) Magnesium Oxide
 
Answer & Explanation Answer: A) Vinegar

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Q:

Propyne and propene can be distinguished by

A) AgNO₃ in ammonia B) conc. H₂SO₄
C) dil. KMnO₄ D) Br₂ in CCl₄
 
Answer & Explanation Answer: A) AgNO₃ in ammonia

Explanation:

Propene, being an alkene, and propyne, being a alkyne, are distinguished using the common chemical tests namely ammoniacal silver nitrate or ammoniacal cuprous chloride. Ammoniacal silver nitrate is also called as Tollen's reagent.

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Q:

The atoms of the elements having same difference between mass number and atomic number are called ______.

A) Isobar B) Isotopes
C) Isotones D) No option is correct
 
Answer & Explanation Answer: C) Isotones

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Q:

Bronze is an alloy of

A) Copper & tin B) Copper & zinc
C) Copper & iron D) Iron & nickel
 
Answer & Explanation Answer: A) Copper & tin

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Q:

Which one of the following is commonly used for pulp bleaching in the paper industry?

A) Mild sulphuric acid B) Glucose isomerase
C) peroxide D) Iodine and water
 
Answer & Explanation Answer: C) peroxide

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Q:

According to an early Indian philosopher everything is made up of ___ basic elements.

A) 2 B) 4
C) 3 D) 5
 
Answer & Explanation Answer: D) 5

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