Science (English Medium) Class 12 - CBSE Question Bank Solutions for Chemistry

Explain any two chemical methods of food preservation.

What type of isomerism is shown by the complex [Co(en)₃]Cl₃

Write the mechanism (using curved arrow notation) of the following reaction :

What type of isomerism is shown by the complex [Co(NH₃)₆] [Cr(CN)₆]?

What type of isomerism is shown by the complex [Co(NH₃)₅(SCN)]²⁺?

Among the following, which one acts as a food preservative?

Aspartame, Aspirin, Sodium Benzoate, Paracetamol

What type of isomerism is exhibited by the complex [Co(NH₃)₅Cl]SO₄?

Give reasons:

On the basis of E° values, O₂ gas should be liberated at anode but it is Cl₂ gas which is liberated in the electrolysis of aqueous NaCl.

Give reasons:

Conductivity of CH₃COOH decreases on dilution.

Give a simple chemical test to distinguish between Aniline and N, N-dimethylaniline

Seeing the growing cases of diabetes and depression among children, Mr. Chopra, the principal of one reputed school organized a seminar in which he invited parents and principals. They all resolved this issue by strictly banning the junk food in schools and by introducing 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. Chopra 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 questions :

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

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

(iii) Why should antidepressant drugs not be taken without consulting a doctor ?

(iv) Give two examples of artificial sweeteners.

Write the IUPAC name of the complex [Cr(NH₃)₄Cl₂]⁺. What type of isomerism does it exhibit?

Write the products of the following reactions:

Write the products of the following reactions:

Write the products of the following reactions:

Arrange the following in the order of the property indicated against each set :

HF, HCl, HBr, HI − increasing bond-dissociation enthalpy.

Complete and balance the following equation: 

\[\ce{PCl3 + H2O ->}\] 

Write one example each of Artificial sweetener.

Write one example each of Antacids.

Give a simple chemical test to distinguish between