'Chemical Effects of Electric Current Essay\r'

'EXTRA QUESTIONS:\r\nQ. Why the bulb refulgences when the electric incumbent sackes done it? Ans. Due to the heating effect of received, the strand of the bulb arrive ats heated to a high temperature and it starts glowing. Q. save a short none on:\r\n(a) take\r\nAns. LED- Light Emitting Diodes be utilize for lighting.\r\nThere are two wires(called pop offs) attached to a LED. One lead is longer than the other. Longer lead\r\n†connected to optimistic destruction of battery\r\nShorter lead- connected to negative terminal of battery\r\nAdvantages over CFL- LEDs consumes less electricity\r\n•LEDs glow even in weak current\r\n•CFL verify mercury which is toxic and hence CFLs require secure disposal\r\nDisadvantages over CFL- LEDs are expensive\r\nQ. dome compounds do non rent electricity in solid form but their sedimentary closure exact electricity. Why? Or unwashed sodium chloride does not care electricity but its aqueous solution conduct elect ricity. Why? Ans. Ionic compounds (e.g.- Common salt) have strong electrostatic forces of attraction among their constituent ions. Thus ions are strongly held and notifynot move. Therefore, cannot conduct electricity. Aqueous solution means solution vigilant by dissolving in piss. Water has a high dielectric constant( major power to screen charges or ability to separate opposite ions in ionic compounds) and indeed diminish the attraction of the two opposite charges. Ions are now free to move and thus conduct electricity.\r\nNCERT QUESTIONS:\r\nQ. When the free ends of a tester are plunge into a solution, the magnetic spur shows deflection. Can you explain the rationalness? Ans. The magnetic or en mountain chain needle shows deflection out-of-pocket to magnetic effect of electric current. This proves that the given solution is a conducting solution as perimeter is complete and current is flowing done the wire wrapped around magnetic compass resulting in deflection of ma gnetic needle.\r\nQ. Name one-third liquids, which when tested in the manner shown in Fig. 14.9, may ca work the magnetic needle to deflect. Ans. Conducting liquids like corn juice(acid), caustic soda solution( fanny) and brine(salt solution) allow current to pass by means of them. Thus, circuit gets complete and current flows through the wire wrapped around magnetic compass resulting in deflection of magnetic needle.\r\nQ. Does pure pissing conduct electricity? If not, what can we do to bother it conducting? Ans. No, Pure or distilled urine does not conduct electricity. Reason- As pure or distilled pissing does not contain change state impurities like salts. Addition of acid, base or salt make pissing conducting as these ionic compounds ionise or dissociate into ions collectable to high dielectric constant of water. Flow of ions conducts electricity.\r\nQ. In grounds of a fire, before the firemen use the water hoses, they shut off the primary(prenominal) electrical t ranslate for the area. Explain why they do this. Ans. Water used by fireman is not pure or distilled. Such water or tap water can conduct electricity as it contains dissolved impurities like salts. If the electrical supply for the area is not shut off and water by slip falls over electrical appliances, then current will pass through water harming the firemen. That is why, in case of a fire, the firemen shut off the main electrical supply for the area before they use the water hoses.\r\nQ. A child staying in a coastal region tests the drinking water and to a fault the seawater with his tester. He finds that the compass needle deflects much in the case of seawater. Can you explain the reason? Ans. Both drinking water and sea water contains dissolved salts or ionisable impurities. But the amount is more(prenominal) in the sea water which makes it more conducting than the drinking water. Therefore, the compass needle deflects more in the case of seawater.\r\nQ. Is it in effect(p) f or the electrician to carry out electrical repairs outdoors during heavy downpour? Explain. Ans. No, it is not safe to repair electrical appliances outdoors during heavy downpour. As we know precipitate water is acidic. Hence, rain water can conduct electricity. The electrician may get electrical shocks while working outdoors during rain or heavy downpour.\r\nQ. Paheli had heard that rain water is as good as distilled water. So, she collected most rain water in a divest glass tumbler and tested it using a tester. To her surprise, she found that the compass needle showed deflection. What could be the reasons? Ans. precipitate water when precipitate dissolves impurities from atmosphere. It contains dissolved impurities like acids which makes it a conducting solution. There are no dissolved acids or impurities present in the distilled water. Hence, rain water can allow electric current to pass through it while distilled water cannot. Passage of current completes circuit and hence c ompass needle showed deflection due to magnetic effect of electric current.\r\n'