Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions for Chemistry

What is the difference between saccharin and saccharic acid?

Name an artificial sweetener which is derivative of sucrose.

Name two α-amino acids which form a dipeptide which is 100 times more sweet than cane sugar?

Aspartame is unstable at cooking temperature, where would you suggest aspartame to be used for sweetening?

Sodium salts of some acids are very useful as food preservatives. Suggest a few such acids.

Assertion: All chemicals added to food items are called food preservatives.

Reason: All these chemicals increase the nutritive value of the food.

Assertion: Preservative are added to food items.

Reason: Preservatives inhibit the growth of microorganisms.

Assertion: Artificial sweeteners are added to the food to control the intake of calories.

Reason: Most of the artificial sweeteners are inert and do not metabolise in the body.

\[\ce{H2}\] gas is adsorbed on activated charcoal to a very little extent in comparison to easily liquefiable gases due to:

(i) very strong van der Waal’s interaction.

(ii) very weak van der Waals forces.

(iii) very low critical temperature.

(iv) very high critical temperature.

What happens when reaction:

Aniline reacts with chloroform in the presence of alcoholic potassium hydroxide

Explain how and why will the rate of reaction for a given reaction be affected when a catalyst is added.

Identify the major product formed when 2-cyclohexylchloroethane undergoes a dehydrohalogenation reaction. Name the reagent which is used to carry out the reaction.

Arrange the following in the increasing order of their property indicated:

Ethanal, Propanone, Propanal, Butanone (reactivity towards nucleophilic addition)

What happens when propanone is treated with CH₃MgBr and then hydrolysed?

What happens when ethanal is treated with excess ethanol and acid?

Which will undergo faster nucleophilic addition reaction?

Acetaldehyde or Propanone

The conversion of an alkyl halide into an alkene by alcoholic KOH is classified as ______.

Which of the following is most reactive in nucleophilic addition reactions?

For the reaction 3A `rightarrow` 2B, rate of reaction `+ (d[B])/(dt)` is equal to ______.

Which isomer of C₅H₁₀ gives a single monochloro compound C₅H₉Cl in bright sunlight?