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प्रश्न
Write the formula of the following compound:
Potassium iodide
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उत्तर
Potassium iodide - KI - `"I"^(1-)`
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संबंधित प्रश्न
Write down the formulae of sodium oxide.
What do the following abbreviations stand for ?
- O
- 2O
- O2
- 3O2
Name the elements water is made of. What are the valencies of these elements ? Work out the chemical
formula for water.
Correct the following statement:
A molecular formula represents an element.
Identify the following substance:
A brown gas D with the irritating smell.
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 |
The formula of the nitride of a metal X is XN, state the formula of :
- its sulphate
- its hydroxide.
Write the formula of the following compound:
Calcium bisulphite
Write the formula of the following compound:
Zinc carbonate
Write the formula of the following compound:
Copper [II] oxide
Write the formula of the following compound:
Iron [II] chloride
Write the formula of the following compound:
Iron [III] sulphate
Write the formula of the following compound:
Iron [II] sulphide
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
NaZnO2
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
Mg(SO4)2
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
NaO
Write the molecular formulae for the following compounds
Calcium (II) phosphate
Write the molecular formulae for the following compounds
Iron (III) 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.
