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Q:

Sphalerite is an ore/mineral of

A) Mercury B) Molybdenum
C) Silver D) Zinc
 
Answer & Explanation Answer: D) Zinc

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Q:

Select the INCORRECT set of Molecular Formula - IUPAC Name - Common Name from the following options.

A) C4H9OH B) C2H3OH - Methanol - Methyl Alcohol
C) C2H5OH - Ethanol - Ethyl Alcohol D) C3H7OH - Propanal - Propyl Alcohol
 
Answer & Explanation Answer: B) C2H3OH - Methanol - Methyl Alcohol

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Q:

Which of the following is used for disinfecting drinking water?

A) Baking powder B) Bleaching powder
C) Washing soda D) Baking soda
 
Answer & Explanation Answer: B) Bleaching powder

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Q:

Except Helium, all noble gases have how many electrons in the outermost shell?

A) 4 B) 8
C) 6 D) 10
 
Answer & Explanation Answer: B) 8

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Q:

Which one of the followingis notan allotrope of carbon?

A) Coal B) Diamond
C) Graphite D) Graphene
 
Answer & Explanation Answer: A) Coal

Explanation:

Allotropy is the property of some chemical elements to exist in two or more different forms, or allotropes, when found in nature. There are several allotropes of carbon like diamond, graphite, graphene, fullerene, etc.Coal is not an allotrope of carbon because it is not 100% carbon. It contains lot of silica, sulphur and other compounds of carbon apart from carbon.

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Q:

The gas evolved when sodium carbonate reacts with hydrochloric acid is

A) Hydrogen B) Chlorine
C) Hydrogen Chloride D) Carbon dioxide
 
Answer & Explanation Answer: D) Carbon dioxide

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Q:

Which of the following elements was the last element in Newland's Law of Octaves?

A) Thorium B) Hydrogen
C) Rubidium D) Bromine
 
Answer & Explanation Answer: A) Thorium

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Q:

Which of the following metals is found in free state?

A) Sodium B) Gold
C) Potassium D) Calcium
 
Answer & Explanation Answer: B) Gold

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