KCET · Chemistry · Aldehydes and Ketones

Which one of the following statements is true?

A Saponification of oil yields a diol
B Drying of oil involves hydrolysis
C Addition of antioxidant to oil minimizes rancidity
D Refining of oil involves hydrogenation

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Answer & Solution

Correct Answer

(C) Addition of antioxidant to oil minimizes rancidity

Step-by-step Solution

Detailed explanation

Saponification of oils yields a triol (glycerol). Drying (hardening) of oil involves hydrogenation. Refining of oil is done by distillation or other such processes but not by hydrogenation.
Antioxidants are added to prevent the oxidation of oil, thus they minimizes rancidity.

Apply the relevant identity from the chapter and substitute the values established in the previous step, keeping the original constraint in view.

Use the simplified expression to isolate the unknown, then plug the result back into the question setup to confirm the working is internally consistent.

Cross-check against a boundary or limiting case. Both the dimensional balance and the qualitative behaviour at the extreme should agree with the candidate answer.

Combine the steps above to identify the correct option. The remaining choices each fail at least one of the consistency, dimensional, or boundary checks.

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Two fly wheels are connected by a non-slipping belt as shown in the figure. \(I_1=4 \mathrm{~kg} \mathrm{~m}^2, r_1=20 \mathrm{~cm}\), \(\mathrm{I}_2=20 \mathrm{kgm}^2\) and \(\mathrm{r}_2=30 \mathrm{~cm}\). A torque of 10 Nm is applied on the smaller wheel. Then match the entries of column I with appropriate entries of column II.

Quantities	Their numerical Values (in SI units)
a. Angular acceleration of smaller wheel	1. \(\frac{5}{3}\)
b. Torque on the larger wheel	2. \(\frac{100}{3}\)
c. Angular acceleration of larger wheel	3. \(\frac{5}{2}\)

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