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Q:

In modern periodic table while going from top to bottom in a group ______.

 

A) size of an atom increases B) size of an atom decreases
C) ionisation energy of an atom increases D)  size and ionisation energy of an atom increases

Answer:   D)  size and ionisation energy of an atom increases



Explanation:
Subject: Chemistry
Exam Prep: Bank Exams
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Permanent hardness of water is due to the presence of  ? 

A) Calcium sulphate B) Calcium bicarbonate
C) Sodium bicarbonate D) Magnesium bicarbonate
 
Answer & Explanation Answer: A) Calcium sulphate

Explanation:
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Select the correct statement (s).

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Answer & Explanation Answer: C) Both (A) and (B)

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Triple point of water corresponds to

A) 1 atm, 0°C B) 1 atm, 0.01°C
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Answer & Explanation Answer: D) 4.58 Torr, 0.01°C

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Which one of the following can be oxidised to the corresponding carbonyl compound:

A) 2-methyl-2-hydroxy propane B) 2-hydroxy propane
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Answer & Explanation Answer: B) 2-hydroxy propane

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Ethanol is converted into ethoxy ethane,

A) by heating excess of ethanol with conc. H2SO4 at 140°C B) by treating with conc. H2SO4 at room temperature
C) by treating with conc. H2SO4 at 273 K D) by heating Ethanol with excess of conc. H2SO4 at 443 K
 
Answer & Explanation Answer: A) by heating excess of ethanol with conc. H2SO4 at 140°C

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What is the third most common gas found in the air we breathe ?

A) Argon B) Neon
C) Carbondioxide D) Hydrogen
 
Answer & Explanation Answer: A) Argon

Explanation:

The most common gas people breathe from clean air is nitrogen. Air is a mixture of gases, and the air on Earth contains about 78 percent nitrogen and about 21 percent oxygen. Argon, carbon dioxide neon, helium, methane, krypton, hydrogen and xenon are in much smaller amounts.

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Recycled plant matter is known as ?

A) Decomposed B) Carbide
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Answer & Explanation Answer: C) Compost

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Leakage of which of the following gases caused the Bhopal gas tragedy ?

A) Carbon monoxide B) Methyl isocyanate
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Answer & Explanation Answer: B) Methyl isocyanate

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