Doubt from chemical kinetics

Question no 215723480030251508854960419426369

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I got it .....

@Samarth_2020 why you have written the equation of k according to 1st order reaction ? If we know the value of k and conc of A and B and rate law then we can simply get the value of rate of the reaction

I always get confused in these type of ques.. Actuallly was waiting for a solution. My friend accidentally posted it

Question no 815723562203621451330414727704935

Is B the correct answer ?

C is correct answer

That’s what the confusion is , by reacting system it means reactant’s volume or the volume of container!

Question no 6 and 1015724383996691200130564218435859

For 6th is the answer 0.5 X 10²

Ya i got it answer is 50 for sixth and help with 10