11. Which one of the following substance does not have a melting point?

1. 1. bromine

   
   
   

   2. sodium chloride

   
   
   

   3. mercury

   
   
   

   4. glass

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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12. What is the number of P atoms in one mole of P₄

1. 1. 1.504 x 10²³

   
   
   

   2. 6.023 x 10²³

   
   
   

   3. 1.209 x 10²⁴

   
   
   

   4. 2.409 x 10²⁴

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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13. How many moles are there is 140 g Si (atomic mass of silicon is 28) ?

1. 1. 5

   
   
   

   2. 10

   
   
   

   3. 28

   
   
   

   4. 140

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: A

   NA

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14. Which one among the following is the heaviest ?

1. 1. 1 mole of water molecules

   
   
   

   2. 1 mole of ammonia molecules

   
   
   

   3. 1 mole of sodium atoms

   
   
   

   4. 1 mole of hydrogen molecules

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: C

   NA

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15. Which of the following is an element ?

1. 1. Alumina

   
   
   

   2. Brass

   
   
   

   3. Graphite

   
   
   

   4. Silicon

   
   
   

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1. View Hint View Answer Discuss in Forum

   NA

   Correct Option: D

   NA

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