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7.Whichoneofthefollowingsaltsmakesthewaterpermanentlyhard?a.Na2CO3b.NaHCO3c.Ca(HCO3)2d.CaSO47. Which one of the following salts makes the water permanently hard?a. \mathrm{Na}_{2} \mathrm{CO}_{3} b. \mathrm{NaHCO}_{3} c. \mathrm{Ca}\left(\mathrm{HCO}_{3}\right)_{2} d. \mathrm{CaSO}_{4} 7.Whichoneofthefollowingsaltsmakesthewaterpermanentlyhard?a.Na2CO3b.NaHCO3c.Ca(HCO3)2d.CaSO4
10.Whatisthedifferencebetweenbiodegradableandnon−biodegradablesubstances?10. What is the difference between biodegradable and non-biodegradable substances?10.Whatisthedifferencebetweenbiodegradableandnon−biodegradablesubstances?
2.Specificheatcapacityofwateris:a.4.2 kJ g−1 K−1b.4.2 J g−1 K−1c.2.4 kJ g−1 K−1d.2.4Jg−1 K−12. Specific heat capacity of water is:a. 4.2 \mathrm{~kJ} \mathrm{~g}^{-1} \mathrm{~K}^{-1} b. 4.2 \mathrm{~J} \mathrm{~g}^{-1} \mathrm{~K}^{-1} c. 2.4 \mathrm{~kJ} \mathrm{~g}^{-1} \mathrm{~K}^{-1} d. 2.4 \mathrm{Jg}^{-1} \mathrm{~K}^{-1} 2.Specificheatcapacityofwateris:a.4.2 kJ g−1 K−1b.4.2 J g−1 K−1c.2.4 kJ g−1 K−1d.2.4Jg−1 K−1
16.Thechemicalsusedtokillorcontrolpestsarecalledpesticides.Theyare:a.dangerousinorganicchemicals.b.dangerousorganicchemicals.c.beneficialinorganicchemicals.d.beneficialorganicchemicals.16. The chemicals used to kill or control pests are called pesticides. They are:a. dangerous inorganic chemicals.b. dangerous organic chemicals.c. beneficial inorganic chemicals.d. beneficial organic chemicals.16.Thechemicalsusedtokillorcontrolpestsarecalledpesticides.Theyare:a.dangerousinorganicchemicals.b.dangerousorganicchemicals.c.beneficialinorganicchemicals.d.beneficialorganicchemicals.
7.Whatarethecausesofhardnessinwater?7. What are the causes of hardness in water?7.Whatarethecausesofhardnessinwater?
11.Whichoneofthefollowingdiseasescausesseverediarrheaandcanbefatal?a.jaundiceb.dysenteryb.cholerad.typhoid11. Which one of the following diseases causes severe diarrhea and can be fatal?a. jaundiceb. dysenteryb. cholerad. typhoid11.Whichoneofthefollowingdiseasescausesseverediarrheaandcanbefatal?a.jaundiceb.dysenteryb.cholerad.typhoid