When equal masses of X and Y absorb the same amount of energy, their
temperatures rise by 5 °C and 10 °C respectively. Which is correct?
A. The specific heat capacity of X is twice that of Y.
B. The specific heat capacity of X is half that of Y.
C. The specific heat capacity of X is one fifth that of Y.
D. The specific heat capacity of X is the same as Y.

The correct answer to this question is 28 

Reaction involved in present system is :   c12h22o11 + h2o → 2 c6h12o6the reaction system is obeying following rate law:   rate = k[c12h22o11]thus, it is a first order reaction.now, for 1st order reactionrate constant (k) =  given: initial conc. = 3.0 g, final conc. = 2.7 g, t = 2.5 h∴rate constant (k) =  ∴ k = 0.04215 h-1now, for 1st order reaction, half life = 0.693/k = 0.693/0.04215 = 16.4 hthus correct answer is option b

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