Calculate the electronegativity of Chlorine from bond energy of Cl – F bond (61 kcal mol−1) F−F (38 kcal mol−1) and Cl−Cl bond (58 kcal mol−1) and electronegativity of fluorine 4.0 eV
here ?
Now the question that arises is, "Why do above mentioned antihistamines not affect the secretion of acid in
stomach?" The reason is that antiallergic and antacid drugs work on different receptors.
CHAPTER - 1 THE SOLID STATE
Q. In India, we have shortage of electricity. Electricity is being produced by hydel power, nuclear power, thermal power, gas power, etc. Which source like wind energy, tidal energy, solar energy is being used to some extent to generate power. Solar energy can be converted into electricity by special type of substances called photovoltaic material. Use of CFC' and LED" lamps can also save lot of electricity.
1. Name one photovoltaic material.
2. Why is solar power generation better than conventional way of generating power? Give one reason.
3. Why is solar power not very popular in India?
4. What are the value associated with above passage?
2. What is the effect of temperature on solubility of gases?
3. Why aquatic species are more comfortable in cold water rather than in warm water?
4. The climber to higher altitude, have low blood oxygen which makes them weak and unable to think
Cleary , What is this condition known as.
5. How can we solve the problems of anoxia?
Calculate the electronegativity of Chlorine from bond energy of Cl – F bond (61 kcal mol−1) F−F (38 kcal mol−1) and Cl−Cl bond (58 kcal mol−1) and electronegativity of fluorine 4.0 eV
Q.15. Biochemical Oxygen Demand (BOO) value can be a measure of water pollution caused by the organic matter. Which of the following statements is correct ?
1. Clean water has BOD value higher than 10 ppm.
2. Aerobic bacteria decrease the BOD value.
3. Polluted water has BOD value higher than 10 ppm.
4. Anaerobic bacteria increase the BOD value.
Q. Viscosity of a liquid arises due to strong intermolecular forces existing between the molecules. Stronger the intermolecular forces, greater is the viscosity. Name the intermolecular forces existing in the following liquids and arrange them in the increasing order of their viscosities. Also give, reason for the
assigned order.
water, hexane and glycerine.
Name the intermolecular forces existing in the following liquids and arrange them in the increasing order of their viscosities. Also give reason for the assigned order.
Q.59. What diseases are caused by streptococcus infections? Name the chemical in the drugs to cure such infections.