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Class 10 Chemistry Water


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Class 9Class 10First YearSecond Year
11.Howdetergentsmakethewaterunfitforaquaticlife?11. How detergents make the water unfit for aquatic life?

7. 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. 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.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}

10. What is the difference between biodegradable and non-biodegradable substances?
10. What is the difference between biodegradable and non-biodegradable substances?

10.Whatisthedifferencebetweenbiodegradableandnonbiodegradablesubstances?10. What is the difference between biodegradable and non-biodegradable substances?

2. 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. 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 g1 K1b.4.2 J g1 K1c.2.4 kJ g1 K1d.2.4Jg1 K12. 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}

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. 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.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.

7. What are the causes of hardness in water?
7. What are the causes of hardness in water?

7.Whatarethecausesofhardnessinwater?7. What are the causes of hardness in water?

11. Which one of the following diseases causes severe diarrhea and can be fatal?a. jaundiceb. dysenteryb. cholerad. typhoid
11. Which one of the following diseases causes severe diarrhea and can be fatal?a. jaundiceb. dysenteryb. cholerad. typhoid

11.Whichoneofthefollowingdiseasescausesseverediarrheaandcanbefatal?a.jaundiceb.dysenteryb.cholerad.typhoid11. Which one of the following diseases causes severe diarrhea and can be fatal?a. jaundiceb. dysenteryb. cholerad. typhoid

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