PART - 1 CH - 3 Classification of Elements and Periodicity in Properties — Chemistry STD 11 Science — Question

Extensive properties depend on the quantity of matter but intensive properties do not. Explain whether the following properties are extensive or intensive. Mass, internal energy, pressure, heat capacity, molar heat capacity, density, mole fraction, specific heat, temperature and molarity.

Rohan heard that instructions were given to the laboratory attendant to store a particular chemical, i.e., keep it in the dark room, add some urea in it, and keep it away from dust. This chemical acts as an oxidizing as well as a reducing agent in both acidic and alkaline media. This chemical is important for use in the pollution control treatment of domestic and industrial effluents.

1. Write the name of this compound.
2. Explain why such precautions are taken for storing this chemical.

What is meant by ‘demineralised’ water and how can it be obtained?

1. Define an ideal gas.
2. Define boiling point of a liquid.
3. Which will have higher viscosity Glycerol or ethylene glycol and why?
4. What are real gases?
5. What do you understand by the term laminar flow?

Addition of HBr to propene yields 2-bromopropane, while in the presence of benzoyl peroxide, the same reaction yields 1-bromopropane. Explain and give mechanism.

State the industrial uses of common ion effect and solubility product.

Express the following in the scientific notation:

1. 0.0048
2. 234, 000
3. 8008
4. 500.0
5. 6.0012

Discuss the principle and method of softening of hard water by synthetic ionexchange resins.