1
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



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Subject: Chemistry
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Q:

Which of the following meals is NOT obtained by reduction using carbon?

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

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1 599
Q:

What product is formed when electricity is passed through an aqueous solution of sodium chloride?

A) Sodium and Chlorine B) Sodium oxide
C) Sodium hydroxide D) Sodium and water
 
Answer & Explanation Answer: C) Sodium hydroxide

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0 561
Q:

In the Modern Periodic Table, a zig-zag line separates

A) metals from halogens B) non-metals from metalloids
C) metals from non-metals D) metals from metalloids
 
Answer & Explanation Answer: C) metals from non-metals

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2 503
Q:

Ice floats on water because its density is

A) more than water B) zero
C) less than water D) same as water
 
Answer & Explanation Answer: C) less than water

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Q:

Which of the following gases makes bread or cake rise making them soft and spongy?

A) CO B) CO2
C) H2 D) O2
 
Answer & Explanation Answer: B) CO2

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Q:

___ is the number of shells for elements of the 3rd period.

 

A) 1 B) 0
C) 2 D) 3
 
Answer & Explanation Answer: D) 3

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Q:

Which among the following is called quicksilver?

A) Titanium B) Mercury
C) Platinum D) Radium
 
Answer & Explanation Answer: B) Mercury

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Q:

Milk of Magnesia is used as a 

 

A) Laxative  B) Pain killer 
C) Sedative  D) Antibiotic
 
Answer & Explanation Answer: A) Laxative 

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