Nabteb 2021 Chemistry Paper I (Obj/Essay) Questions & Answers

2021 Nabteb
2021 Nabteb Obj and Essay Questions and Answers

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Saturday 26th June 2021 Chemistry paper I objective and essay (9: 00am – 11:30am)

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NABTEB 2021 CHEMISTRY ESSAY AND OBJ ANSWERS
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CHEMISTRY OBJ
1-10: ABDCCDBDCD
11-20: ABCDDDCDBC
21-30: CABDCCCBAD
31-40: BCBDABCACC
41-50: CABDBACCBD
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1ai)
Entropy is a measure of degree or disorder or randomness of a system unit is JK^-1 mol^-1.

1di)
_Under Electrovalent Compound_
1. They are solid at room temperature and do not vaporise easily.
2. They have high melting point and boiling point.
3. Elctrovalent Compounds readily dissolve in water and other polar solvent.
4. They do not dissolve in non – polar solvents such as benzene, ether, etc.

_Under Covalent Compound_
1. They are gases or volatile liquids because their molecules being electrically neutral are not bound by strong attractive force.
2. Covalent compounds readily dissolve in non – polar organic solvents such as benzene etc.
3. They have low melting and boiling points.
4. Covalent Compounds do not conduct electricity.

1dii)
1. High melting and boiling points.
2. Good Conductors of heat and electricity.
3. Relatively high densities.
4. Sonorous.
5. Malleable that is can be hammered into sheets.

1diii)
1. Nature of reactant.
2. Surface area of the reactant.
3. Presence of catalyst.
4. Presence of light.
5. Temperature of the reaction mixture.

iii) Gay Lussac’s law states that the volume of gas which take part in a chemical reaction bear a simple whole number ratio to another end to the volume of the products, if gaseous, when measured at constant temperature and pressure.
H2(g) + —— 2HCL(g)

2ei)
Hardness of water is due to the presence of dissolved Calcium tetraoxosulphate(VI), Magnesiumtetraoxosulphate(VI) and Calcium hydrogen trioxocarbonate(IV) in water.

2eii)
_Under Temporary Hardness_
1. This type of hardness is caused by the presence of dissolved calcium hydrogen trioxocarbonate(IV) Can(HCO3)2.
2. It causes furring of kettles and boilers and also stalagmites and stalactites.

_Under Permanent Hardness_
1. This type of hardness is caused by the presence of calcium or magnesium ions in the form of so lube chloride.
2. It can be removed by using chemicals.

2eiii)
1. Addition of caustic soda.
2. Distillation.
3. Addition of Washing Soda.

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