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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



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Subject: Chemistry
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Which of the following is not the properties of an ionic compound?

A) Soluble in water and insoluble in petrol B) High melting and boiling points
C) Low melting and boiling points D) Solid and hard
 
Answer & Explanation Answer: C) Low melting and boiling points

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Which one of the following is a cation?

A) Carbonate B) Nitrate
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Answer & Explanation Answer: C) Ammonium

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Which of the following scientists gave the law that governs the force of attraction/repulsion between two charged particles?

A) Charles Dufay B) Michael Faraday
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Answer & Explanation Answer: D) Charles Coulomb

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Which compound is formed when a Magnesium ribbon is burnt in air?

A) Magnesium Nitrate B) Magnesium Carbonate
C) Magnesium Oxide D) Magnesium Nitride
 
Answer & Explanation Answer: C) Magnesium Oxide

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What are transition elements?

A) Elements whose two outermost shells are incomplete B) Elements which possess properties of both, metals and non-metals
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Answer & Explanation Answer: A) Elements whose two outermost shells are incomplete

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Which one of the following statements would be INCORRECT to use?

 

A) An atom of a compound B) A mole of an element
C) A mole of a compound D) An atom of an element
 
Answer & Explanation Answer: A) An atom of a compound

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Which of the following gases turns lime water milky?

A) O3 B) CO2
C) O2 D) CO
 
Answer & Explanation Answer: B) CO2

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Q:

Which of the following statements is INCORRECT?

A) Solids have definite volume  B) solids are rigid 
C) Solids have indefinite shape  D) Solids are almost incompressible
 
Answer & Explanation Answer: C) Solids have indefinite shape 

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