A `20cm` length of a certain solution causes right-handed rotation of `38^@`. A `30cm` length of another solution causes left-handed rotation of `24^@`. The optical rotation caused by `30cm` length of a mixture of the above solutions in the volume ratio `1:2` isA. (a) Left handed rotation of `14^@`B. (b) Right handed rotation of `14^@`C. (c) Left handed rotation of `3^@`D. (d) Right handed rotation of `3^@`

A `20cm` length of a certain solution causes right-handed rotation of

1.	A `20cm` length of a certain solution causes right-handed rotation of `38^@`. A `30cm` length of another solution causes left-handed rotation of `24^@`. The optical rotation caused by `30cm` length of a mixture of the above solutions in the volume ratio `1:2` isA. (a) Left handed rotation of `14^@`B. (b) Right handed rotation of `14^@`C. (c) Left handed rotation of `3^@`D. (d) Right handed rotation of `3^@`
Answer» Correct Answer - D As `thetaproplambda` Volume ratio `1:2` in a tube of length `30cm` means `10cm` length of first solution and `20cm` length of second solution. Rotation produced by `10cm` length of first solution `theta_1=(38^@)/(20)xx10=19^@` Rotation produced by `20cm` length of second solution `theta_2=(24^@)/(30)xx20=-16^@` `:.` Total rotation produced `=19^@-16^@=3^@`

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