Chemistry Class 12 NCERT Solutions: Chapter 16 Chemistry in Everyday Life Part 4

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Q: 1. Sleeping pills are recommended by doctors to the patients suffering from sleeplessness but it is not advisable to take its doses without consultation with the doctor, Why?

Answer:

Most drugs when taken in doses higher than recommended may cause harmful effects and sometimes, may even lead to death. Hence, a doctor should always be consulted before taking any medicine.

Q: 2. With reference to which classification has the statement, ‘ranitidine is an antacid” been given?

Answer:

The given statement refers to the classification of pharmacological effects of the drug. This is because any drug that is used to counteract the effects of excess acid in the stomach is called an antacid.

Q: 3. Why do we require artificial sweetening agents?

Answer:

A large number of people are suffering from diseases such as diabetes and obesity. These people cannot take normal sugar i.e., sucrose as it is harmful for them. Therefore, artificial sweetening agents that do not add to the calorie intake of a person are required. Saccharin, aspartame, and alitame are a few examples of artificial sweeteners.

Q: 4. Write the chemical equation for preparing sodium soap from glyceryl oleate and glyceryl palmitate. Structural formulae of these compounds are given below.

(i)

(ii)

Answer:

(i)

Q 4 i Glyceryl Palmitate, Glycerol Sodium Palmitate (Soap)

Q 4 I Glyceryl Palmitate, Glycerol Sodium Palmitate (Soap)

Q 4 i Glyceryl Palmitate, Glycerol Sodium Palmitate (Soap)

(ii)

Q 4 ii Glyceryl oleate, Glycerol Sodium oleate (Soap)

Q 4 Ii Glyceryl Oleate, Glycerol Sodium Oleate (Soap)

Q 4 ii Glyceryl oleate, Glycerol Sodium oleate (Soap)

Q: 5. Following type of nom-ionic detergents are present in liquid detergents, emulsifying agents and wetting agents. Label the hydrophilic and hydrophobic parts in the molecule. Identify the functional group (s) present in the molecule.

Q 5 The Hydrophilic and Hydrophobic Parts in the Molecule

Q 5 the Hydrophilic and Hydrophobic Parts in the Molecule

Q 5 The Hydrophilic and Hydrophobic Parts in the Molecule

Answer:

Q 5 Ans The Hydrophilic and Hydrophobic Parts in the Molecule

Q 5 Ans the Hydrophilic and Hydrophobic Parts in the Molecule

Q 5 Ans The Hydrophilic and Hydrophobic Parts in the Molecule

Functional groups present in the molecule are:

(i) Ether, and

(ii) Primary alcoholic group