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  • Which of the following reaction proceeds nearly to completion ? Option: 1 <img alt="CO_2 \rightleftharpoons H_2 CO_3 \: \: \: \: \: \: \: \: \:

Which of the following reaction proceeds nearly to completion ? 

Option: 1

CO_2 \rightleftharpoons H_2 CO_3 \: \: \: \: \: \: \: \: \: \: K_c = 1.7 \times 10 ^{-2}


Option: 2

H_2 CO_3 \rightleftharpoons HCO_3 + H^+ \: \: \: \: \: \: K_c = 8.4 \times 10 ^{-7}


Option: 3

CaCO_3 \rightleftharpoons Ca^{2+} + CO_3^- \: \: \: K_c = 8.4 \times 10^{-9}


Option: 4

H_2 + Br _2 \rightleftharpoons 2HBr \: \: \: \: k_c = 5.4 \times 10 ^{18}


Answers (1)

best_answer

As we have learned

The composition of equilibrium mixture when Kc > 1000 -

If Kc > 103,  products predominate over reactants i.e. if Kc is very large, the reaction proceeds nearly to completion.

- wherein

e.g. 

H_{2}+ Cl_{2}\rightleftharpoons 2HCl
 

K_{c}=4\times 10^{31}

 

H_{2}+Br_{2}\rightleftharpoons 2HBr
 

K_{c}=5.4\times 10^{18}

 

  Reaction a,b and c have k_c value less tha 10 ^{3}  but reaction d has k_c value greater than 10 ^{3} we can say this reaction proceeds to completion 

Therefore, Option(4) is correct

Posted by

Shailly goel

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