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100% NECO Gce 2017 Real ( chemistry Obj ) Answers Available Here..
Author: Mr. Dan
Posted on: 06:08:04 Thu, 09 Nov 2017


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100% NECO Gce 2017 Real ( chemistry Obj ) Answers Available Here..
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Chemistry OBJ:
1-10: ADEBBDCAAC
11-20: ABBEBDDBCD
21-30: BABDCECEEC
31-40: CBDEBBBCBB
41-50: AECBBEDBDE
51-60: ACEBDCCEDB


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(2a)
(i) Temporary hardness - Dissolved calcium hydrogencarbonate
(ii) Permanent hardness -Dissolved calcium sulfate.

(2bi)
(i) Temporary Hardness can be Removed By Boiling
(ii) Permanent hardness can be removed by use of washing soda (sodium carbonate); ion exchange; the use of polyphosphate water softeners.

(2bii)
-Advantages:
(i) Calcium ions in the water are good for children's teeth and bones.
(ii) The soothe it forms is good for ceramics purposes.

-Disadvantages:
(i) It is more difficult to form a lather with soap.
(ii) Scum may form in a reaction with soap, wasting the soap.

(2ci)
A saturated solution is a chemical solution containing the maximum concentration of a solute dissolved in the solvent.

(2cii)

(2ciii)
(i) Anthracite Coal
(ii) Bituminous coal
(iii) Subbituminous coal

(2civ)
Coal tar

(2di)
(i) Zinc is not a transition metal because it forms only Zn2+ ions with all the 3d electrons present.
(ii) Zn not a transition metal, because it forms only Sc3+ ions with n d-electrons

(2dii)
Fine chemicalChemical substances prepared to a very high degree of purity for use in research and industry.

(2diii)
(i) dyes
(ii) perfumes

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