Q. 594.0( 3 Votes )
In the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.
Assertion (A): Among the two O–H bonds in H2O molecule, the energy required to break the first O–H bond and the other O–H bond is the same.
Reason (R) : This is because the electronic environment around oxygen is the same even after breakage of one O–H bond.
(i) A and R both are correct, and R is correct explanation of A.
(ii) A and R both are correct, but R is not the correct explanation of A.
(iii) A is true but R is false.
(iv) A and R both are false.
Answer :
(iv);
Both the assertion and the reason is false. There is average bond enthalpy for the O-H bonds of water.
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PREVIOUSIn the following question a statement of Assertion (A) followed by a statement of Reason (R) is given. Choose the correct option out of the choices given below each question.Assertion (A) : Though the central atom of both NH3 and H2O molecules are sp3 hybridised, yet H–N–H bond angle is greater than that of H–O–H.Reason (R) : This is because nitrogen atom has one lone pair and oxygen atom has two lone pairs.(i) A and R both are correct, and R is the correct explanation of A.(ii) A and R both are correct, but R is not the correct explanation of A.(iii) A is true but R is false.(iv) A and R both are false.NEXT(i) Discuss the significance/ applications of dipole moment.(ii) Represent diagrammatically the bond moments and the resultant dipole moment in CO2 , NF3 and CHCl3.
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