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Which of the following pairs consists of molecules having the same mass number?

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H_{2} O and D_{2} O

H_{2} O and HTO

D_{2} O and HTO

D_{2} O and HCl

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detailed solution

Correct option is C

$In D_{2} O$

$({}_{1}H_{2}^{2} O)$ Total mass number of two ${}_{1}^{2}H$ isotopes is 4

In HTO $({}_{1}H^{1} {}_{1}H^{3} O)$ Total mass number ${}_{1}^{1}H and {}_{1}H^{3}$ isotopes is 4.

$D_{2} O$ =1+16=20

HTO=1+3+16=20

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