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प्रश्न
Write the formula of the following compound:
Sodium sulphite
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उत्तर
Sodium sulphite - Na2SO3 - `"Na"^(1+)["SO"_3]^(2-)`
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संबंधित प्रश्न
Write the chemical formula of the Calcium carbonate.
State the chemical symbols for the following elements :
Sodium, Potassium, Iron, Copper, Mercury, Silver.
The atomicities of ozone, sulphur, phosphorus and argon are respectively :
If the valency of hydrogen is 1 and that of nitrogen is 3, work out the formula for ammonia.
Which of the following represents a correct chemical formula ?
Give the formula and valency of:
chromate ………….…….. .
Correct the following statement:
Formula of iron (lll) oxide is FeO.
Give the empirical formula of Acitic Acid CH3COOH.
Match the following:
| Column A | Column B |
| (a) Pb(NO3)2 | (i) rotten eggs smell |
| (b) CO2 | (ii) burns with a pop sound |
| (c) (NH4)2Cr2O7 | (iii) the suffocating smell of sulphur |
| (d) HCI | (iv) lime water turns milky |
| (e) NO2 | (v) crackling sound |
| (f) O2 | (vi) residue swells up |
| (g) H2 | (vii) brown gas |
| (i) H2S | (viii) supports combustion |
| (j) SO2 | (ix) fumes with NH3 solution |
Write the formula of the following compound:
Potassium bicarbonate
Write the formula of the following compound:
Potassium nitrite
Write the formula of the following compound:
Sodium hydroxide
Define the term Relative atomic mass. State why indirect methods are utilised to determine the absolute mass of an atom. Explain in brief the indirect method used.
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
BaCl2
What do you understand by chemical formula of a compound? What is its significance?
Find the valency of the element which is underlined in the following formula.
- NaCl
- CO2
- Al (PO4)
- Ba (NO3)2
- CaCl2
Write the molecular formulae for the following compounds
Magnesium (II) acetate
Give the chemical formulae for the following compounds and compute the ratio by mass of the combining elements in each one of them. (You may use appendix-III).
- Ammonia
- Carbon monoxide
- (Hydrogen chloride
- Aluminium fluoride
- Magnesium sulphide
Play a game for writing formula.
Example 1: Make placards with symbols and valencies of the elements separately. Each student should hold two placards, one with the symbol in the right hand and the other with the valency in the left hand. Keeping the symbols in place, students should criss-cross their valencies to form the formula of a compound.
