GenTech

Conserve  What is Pollution? Pollution , we hear it every other day at school, college and read about it in newspapers. So what is it? Pollution occurs when pollutants contaminate the natural surroundings; which brings about changes that affect our normal lifestyles adversely. Pollutants are the key elements or components of pollution which are generally waste materials of different forms. Pollution disturbs our ecosystem and the balance in the environment. With modernization and development in our lives pollution has reached its peak; giving rise to global warming and human illness. Pollution occurs in different forms; air, water, soil, radioactive, noise, heat/ thermal and light. Every form of pollution has two sources of occurrence; the point and the non-point sources. The point sources are easy to identify, monitor and control, whereas the non-point sources are hard to control.  Let us discuss the different types of pollutions, their causes and effects

Welcome here and have a good knowledge with our community Gain total knowledge on this topic. NCERT TEXTBOOK QUESTIONS SOLVED Question 1. Choose the correct answer: A thermodynamic state junction is a quantity (i) used to determine heat changes (ii) whose value is independent of path (iii) used to determine pressure volume work (iv) whose value depends on temperature only. Answer:  (ii) whose value is independent of path Question 2. For the process to occur under adiabatic conditions, the correct condition is: (i) ∆T= 0 (ii) ∆p = 0 (iii) q = 0 (iv)  w = 0 Ans.   (iii) q = 0 Question  3. The enthalpies of all elements in their standard states are : ‘ (i) unity (ii) zero (iii) < 0 (iv) different for each element Answer:   (ii) zero Question 4. Answer: Question 5. The enthalpy of combustion of methane, graphite and dihydrogen at 298 K are -890.3 KJ mol -1 , – 393.5 KJ mol -1  and – 285.8 KJ mol -1  respectively. Enthalpy of formation of CHJg) will be (i)