6
Q:

According to the modern Periodic Law, the properties of elements are periodic functions of their

A) volency B) atomic mass
C) number of neutrons D) atomic number

Answer:   D) atomic number



Explanation:

Atomic number is the serial number of an element in the periodic classification of elements. It gives the number of protons and also the number of electrons in an atom.

Subject: Chemistry
Q:

The elements belonging to groups ............ are known as 'd' block elements.

 

A) 3 to 12 B) 1 and 2
C) 13 to 18 D) 3 to 10
 
Answer & Explanation Answer: A) 3 to 12

Explanation:
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0 358
Q:

220 g of carbon dioxide contains .......... moles.

 

A) 5 B) 6
C) 3 D) 4
 
Answer & Explanation Answer: A) 5

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0 501
Q:

A solution contains 42 g of common salt in 320 g of water. Calculate the concentration in terms of mass by mass percentage of the solution?

 

A) 11.6 g B) 12.6%
C) 11.6% D) 10.36%
 
Answer & Explanation Answer: C) 11.6%

Explanation:
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1 219
Q:

............ is a purple-coloured solid halogen.

 

A) Bromine B) Fluorine
C) Chlorine D) Iodine
 
Answer & Explanation Answer: D) Iodine

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Q:

The chemical formula of Ammonium phosphate is ............

 

A) (NH4)3PO4 B) (NH4)2PO4
C) (NH4)2P02 D) NH4PO4
 
Answer & Explanation Answer: A) (NH4)3PO4

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0 351
Q:

Which among the following has its refractive index closest to that of crown glass?

 

A) Diamond   B) Ruby  
C) Sapphire   D) Canada balsam  
 
Answer & Explanation Answer: D) Canada balsam  

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1 129
Q:

Which among the following is a cation?

 

A) Ammonium   B) Iodide  
C) Chloride   D)
 
Answer & Explanation Answer: A) Ammonium  

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1 152
Q:

Which of the following can be used as a catalyst in Hydrogenation reaction?

 

A) Barium B) Iron
C) Tungsten D) Palladium
 
Answer & Explanation Answer: D) Palladium

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