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Question
Explain the meaning of the term ‘compound’ with a suitable example.
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Solution
Compound: “Is a pure substance made up of two or more elements combined chemically by in a fixed proportion.”
Example: CO2 carbon dioxide is made up of two elements carbon and oxygen C,
12 parts by weight and oxygen
2 × 16 = 32 parts by weight
i.e. in ratio C : O = 12 : 16 = 3 : 4
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RELATED QUESTIONS
Match the following:
|
Compound |
Formula |
|
1. Boric acid |
i. NaOH |
|
2. Phosphoric acid |
ii. SiO2 |
|
3. Nitrous acid |
iii. Na2CO3 |
|
4. Nitric acid |
iv. KOH |
|
5. Sulphurous acid |
v. CaCO3 |
|
6. Sulphuric acid |
vi. NaHCO3 |
|
7. Hydrochloric acid |
vii. H2S |
|
8. Silica (sand) |
viii. H2O |
|
9. Caustic soda (sodium hydroxide) |
ix. PH3 |
|
10. Caustic potash (potassium hydroxide) |
x. CH4 |
|
11. Washing soda (sodium carbonate) |
xi. NH3 |
|
12. Baking soda (sodium bicarbonate) |
xii. HCl |
|
13. Lime stone. (calcium carbonate) |
xiii. H2SO3 |
|
14. Water |
xiv. HNO3 |
|
15. Hydrogen sulphide |
xv. HNO2 |
|
16. Ammonia |
xvi. H3BO3 |
|
17. Phosphine |
xvii. H3PO4 |
|
18. Methane |
xviii. H2SO4 |
Write the basic radicals and acidic radicals of the following and then write the chemical formulae of these compounds.
Bismuth nitrate
Write the chemical name of the following compound:
K2MnO4
Write the chemical name of the following compound
Mn3(BO3)2
Give the name of the following compound
KClO4
Choose the correct answer from the options given below.
The formula of iron (III) sulphate is ______.
Write the name of the following compound:
KClO
Write the name of the following compound:
K2Cr2O7
Write the name of the following compound:
H2SO3
Write the name of the following compound:
NH4OH
