16. Which one among the following is the equivalent weight of sulphuric acid?
    (Atomic weight : H = 1, S = 32, O = 16)
    

1. 1. 98

   
   
   

   2. 60

   
   
   

   3. 100

   
   
   

   4. 49

   
   
   

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1. View Hint View Answer Discuss in Forum

   H₂SO₄ ⇒ 1 + 32 + 16 = 49

   Correct Option: D

   H₂SO₄ ⇒ 1 + 32 + 16 = 49

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17. The nuclear fuel in the sun is

1. 1. helium

   
   
   

   2. hydrogen

   
   
   

   3. uranium

   
   
   

   4. alpha particles

   
   
   

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1. View Hint View Answer Discuss in Forum

   Helium is the nuclear fuel in the sun.

   Correct Option: A

   Helium is the nuclear fuel in the sun.

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18. Cinnabar is an ore of

1. 1. Hg

   
   
   

   2. Cu

   
   
   

   3. Pb

   
   
   

   4. Zn

   
   
   

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1. View Hint View Answer Discuss in Forum

   Cinnabar is HgS.

   Correct Option: A

   Cinnabar is HgS.

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19. In which one of the following is the valence electronic configuration, ns²np³found ?

1. 1. Carbon

   
   
   

   2. Oxygen

   
   
   

   3. Nitrogen

   
   
   

   4. Argon

   
   
   

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1. View Hint View Answer Discuss in Forum

   Nitrogen (Z = 7) has the electronic configuration 1 s² 2s² 2p_x ¹ 2p_y ¹ 2p_z ¹ (i.e. ns² np³)

   Correct Option: C

   Nitrogen (Z = 7) has the electronic configuration 1 s² 2s² 2p_x ¹ 2p_y ¹ 2p_z ¹ (i.e. ns² np³)

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20. The number of protons in a negatively charged atom (anion) is

1. 1. more than the atomic number of the element

   
   
   

   2. less than the atomic number of the element

   
   
   

   3. more than the number of elecrons in the atom

   
   
   

   4. less than the number of electrons in the atom

   
   
   

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1. View Hint View Answer Discuss in Forum

   In case of a neutral atom
   Number of protons = Number of electrons
   Anion is formed by gain of electron (s) by a neutral atom. Thus in case of anion.
   Number of electrons > Number of protons

   Correct Option: D

   In case of a neutral atom
   Number of protons = Number of electrons
   Anion is formed by gain of electron (s) by a neutral atom. Thus in case of anion.
   Number of electrons > Number of protons

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