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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
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The only non-metal which is liquid at room temperature is

A) Mercury B) Bromine
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Answer & Explanation Answer: B) Bromine

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Which of the following elements replaced eka-Aluminium in Mendeleev's Periodic table?

A) Scandium B) Gallium
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Answer & Explanation Answer: B) Gallium

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Non-metal oxides are usually

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Answer & Explanation Answer: A) acidic

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Which of the following processes will take place the slowest for the same quantity of liquid?

A) Boiling B) Condensation
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Answer & Explanation Answer: C) Evaporation

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Q:

The percentage of carbon in CO2 is

A) 12 B) 44
C) 14 D) 27.3
 
Answer & Explanation Answer: D) 27.3

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Q:

A/an ___ flame is produced when the oxygen supply is sufficient.

 

A) red B) orange
C) blue D) green
 
Answer & Explanation Answer: C) blue

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Q:

In the modern periodic table, which of the two periods contain 8 elements each?

A) 4 and 5 B) 3 and 4
C) 1 and 2 D) 2 and 3
 
Answer & Explanation Answer: D) 2 and 3

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