100% VERIFIED CHEMISTRY OBJ ANSWERS
1-10: AAEBBDCAAC
11-20: ABBEBDDBCD
21-30: BABDCECEEC
31-40: CBDEBBBCBB
41-50: AECBBEDBDE
51-60: ACEBDCCEDB
11-20: ABBEBDDBCD
21-30: BABDCECEEC
31-40: CBDEBBBCBB
41-50: AECBBEDBDE
51-60: ACEBDCCEDB
100% VERIFIED CHEMISTRY THEORY ANSWERS
2a)
(i) Temporary hardness – Dissolved calcium hydrogencarbonate
(ii) Permanent hardness -Dissolved calcium sulfate.
(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.
(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.
-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.
(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.
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
(i) Anthracite Coal
(ii) Bituminous coal
(iii) Subbituminous coal
(2civ)
Coal tar
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
(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.
Fine chemicalChemical substances prepared to a very high degree of purity for use in research and industry.
(2diii)
(i) dyes
(ii) perfumes
(i) dyes
(ii) perfumes
===============================
(3ai)
Petroleum Gas and Petrol>Kerosene>Diesel>Asphalt
Petroleum Gas and Petrol>Kerosene>Diesel>Asphalt
(3aii)
I. Asphalt
II. Kerosene
III. Petroleum Gas and petrol
Iv. Asphalt
I. Asphalt
II. Kerosene
III. Petroleum Gas and petrol
Iv. Asphalt
(3bi)
I. Ethene
II. Propene
I. Ethene
II. Propene
(3bii)
(i) Structural Isomerism
(ii) Stereo Isomerism
(i) Structural Isomerism
(ii) Stereo Isomerism
(3biii)
19R – 1s² 2s² 2p6 3s² 3p6 4s¹
10S – 1s² 2s² 2p6
24T – 1s² 2s² 2p6 3s² 3p6 4s² 3d4
19R – 1s² 2s² 2p6 3s² 3p6 4s¹
10S – 1s² 2s² 2p6
24T – 1s² 2s² 2p6 3s² 3p6 4s² 3d4
(3biv)
Group 6
Group 6
(3ci)
I. AgNO3 and BaCl2
II. Bacl2 and Na2SO4
III. Ca(NO3)2 and H2CO3
I. AgNO3 and BaCl2
II. Bacl2 and Na2SO4
III. Ca(NO3)2 and H2CO3
(3cii)
(i) Filtration
(ii) Flocculation
(iii) Disinfection
(i) Filtration
(ii) Flocculation
(iii) Disinfection
(3d)
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