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Question

If the letter ‘R’ was used to represent any of the elements in the group, then the hydride and oxide of carbon would respectively be represented as ?


A

RH4,RO

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B

RH4,RO2

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C

RH2,RO2

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D

RH2,RO

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Solution

The correct option is B

RH4,RO2


The explanation for the correct Option:

Option (B): RH4,RO2

  • The group R is representing carbon i.e. 14th group elements.
  • The hydrides from this group would be represented as RH4.
  • This is because the elements belonging to the 14th group will have valence electron=4 i.e. valency is also equal to 4 and the valency of hydrogen is 1 so the formula of hydride isRH4. R+2H2(g)RH4
  • Also, the oxides from this group would be represented as RO2.
  • This is because the valency of the element R is 4 and the valency of oxygen is 2 so the oxide form isRO2. R+O2(g)RO2

The explanation for the incorrect options:

Option (A): RH4,RO

  • The group R is representing carbon i.e. 14th group elements.
  • The oxides from this group would be represented asRO2. This is because the valency of the element R is 4 and the valency of oxygen is 2 so, the oxide form isRO2. R+O2(g)RO2
  • Hence, it is an incorrect option.

Option (C): RH2,RO2

  • Hydrogen interacts with non-metals to generate compounds, which are also known as hydrides.
  • The group 14th elements have valence electron, so valency is also equal to 4 and hydrogen has a valency of 1 so the formula for hydride areRH4. R+2H2(g)RH4
  • Hence, it is an incorrect option.

Option (D): RH2,RO

  • Hydrogen interacts with non-metals to generate compounds, which are also known as hydrides.
  • The group 14th elements have valence electron=4, so valency is also equal to 4 and hydrogen has a valency of 1 so the formula for hydride areRH4. R+2H2(g)RH4
  • Hence, it is an incorrect option.

Hence, then the hydride and oxide of carbon would respectively be represented as RH4andRO2.


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