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Chemistry Nargis

The document contains a series of chemistry questions covering topics such as chemical formulas, valency, molecular mass, chemical equations, and types of chemical reactions. It includes multiple-choice questions, definitions, and requests for examples and explanations. The content is aimed at assessing knowledge in basic chemistry concepts and reactions.

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11 views2 pages

Chemistry Nargis

The document contains a series of chemistry questions covering topics such as chemical formulas, valency, molecular mass, chemical equations, and types of chemical reactions. It includes multiple-choice questions, definitions, and requests for examples and explanations. The content is aimed at assessing knowledge in basic chemistry concepts and reactions.

Uploaded by

msenterprise23.mid
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PDF, TXT or read online on Scribd
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CHEMISTRY

1. The correct formula of aluminium oxide is


a. AlO3
b. AlO2
c. Al2O3
d. Al3O2

2. The valency of lead in lead oxide (PbO) is


a. one
b. two
c. three
d. four

3. Which of the following elements has a molecular mass that is


four times its atomic mass?
a. Oxygen
b. Neon
c. Phosphorus
d. Sulphur

4. Write the formula of the following:Nitric acid, Caustic soda,


Lime stone, Phosphine
5. Select the basic and acidic radicals in the following
compounds.(a) MgSO4 (b) (NH4)2SO4
6. Give the formula and valency of : (a) aluminate(b) cupric
7. What is a symbol of an element ? What information does it
convey ?
8. Write the full form of IUPAC.
9. Explain the terms 'valency' and 'variable valency'.
10. What is the significance of a formula ?
11. Write chemical equations for the following word equations
and balance them.

a. Ammonia + oxygen ⟶ nitric oxide + water


b. Sodium chloride reacts with silver nitrate to produce
silver chloride and sodium nitrate

1
CHEMISTRY
12. State the conditions necessary for a chemical change or
reaction.
13. Define: Effervescence
14. Give an example of a reaction where Electricity is involved
15. Define : Photochemical reaction with example
16. Give an example of each of the following chemical changes.
a. A reaction involving 1. blue solution 2. formation of a dirty
green precipitate
b. Two gases combine to form a white solid
17. Give reason why Silver nitrate solution is kept in coloured
bottles.
18. Which of the following is not a characteristic of a chemical
change?
1. It is irreversible

2. No net energy change is involved

3. New substance is formed

4. Involves absorption or liberation of energy

19. The reaction:


BaCl2 (aq) + H2SO4 (aq) ⟶ BaSO4 (s) + 2HCl (aq) is
1. displacement reaction

2. neutralisation reaction

3. decomposition reaction

4. double displacement reaction

20. Define neutralization reaction with an example. Give a


balanced equation for this reaction. Give three applications of
neutralization reactions.

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