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

Account for the following : Solid PCl₅ is ionic in nature.

Draw the structure of the semicarbazone of ethanal.

Write the mechanism of the following reaction :

Which one of the following is a disaccharide : Starch, Maltose, Fructose, Glucose ?

Mr. Roy, the principal of one reputed school organized a seminar in which he invited parents and principals to discuss the serious issue of diabetes and depression in students. They all resolved this issue by strictly banning the junk food in schools and to introduce healthy snacks and drinks like soup, lassi, milk etc. in school canteens. They also decided to make compulsory half an hour physical activities for the students in the morning assembly daily. After six months, Mr. Roy conducted the health survey in most of the schools and discovered a tremendous improvement in the health of students.

After reading the above passage, answer the following :

(i) What are the values (at least two) displayed by Mr. Roy ?

(ii) As a student, how can you spread awareness about this issue ?

(iii) What are tranquillizers ? Give an example.

(iv) Why is use of aspartame limited to cold foods and drinks ?

How is ‘cast iron’ different from ‘pig iron’?

Write the chemical equations involved when aniline is treated with the following reagents:

CHCI₃ + KOH

Write the structures of the main products when acetone (CH₃ − CO − CH₃) reacts with the following reagent :

H₂N − NHCONH₂/H⁺

Write the mechanism of the following reaction :

On the occasion of World Health Day, Dr. Satpal organized a ‘health camp’ for the poor farmers living in a nearby village. After check-up, he was shocked to see that most of the farmers suffered from cancer due to regular exposure to pesticides and many were diabetic. They distributed free medicines to them. Dr. Satpal immediately reported the matter to the
National Human Rights Commission (NHRC). On the suggestions of NHRC, the government decided to provide medical care, financial assistance, setting up of super-speciality hospitals for treatment and prevention of the deadly disease in the affected villages all over India.

(i) Write the values shown by

(a) Dr. Satpal

(b) NHRC

(ii) What type of analgesics are chiefly used for the relief of pains of terminal cancer ?

(iii) Give an example of artificial sweetener that could have been recommended to diabetic patients

Write the products formed when CH₃CHO reacts with the following reagents : HCN

Write the products formed when CH₃CHO reacts with the following reagents : H₂N – OH

What are the products of hydrolysis of maltose?

Complete the following equations: Ag+PCl₅ →

Define the following term:

Invert sugar

Define the following terms:

Oligosaccharides

The conductivity of 0.20 M solution of KCl at 298 K is 0.0248 S cm⁻¹. Calculate its molar conductivity.

The resistance of a conductivity cell containing 0.001 M KCl solution at 298 K is 1500 Ω. What is the cell constant if the conductivity of 0.001 M KCl solution at 298 K is 0.146 × 10⁻³ S cm⁻¹.

Define conductivity for the solution of an electrolyte.

What is the role of desorption in the process of catalysis?