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प्रश्न
State the chemical symbols for the following elements :
Sodium, Potassium, Iron, Copper, Mercury, Silver.
उत्तर
Following are the chemical symbols of the listed elements:
- Sodium: Na
- Potassium: K
- Iron: Fe
- Copper: Cu
- Mercury: Hg
- Silver: Ag
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संबंधित प्रश्न
Give the empirical formula of : Benzene C6H6
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 sulphate
Write the formula of the following compound:
Potassium nitrite
Write the formula of the following compound:
Potassium bisulphite
Write the formula of the following compound:
Copper [I] oxide
Write the formula of the following compound:
Iron [III] chloride
Write the formula of the following compound:
Iron [III] oxide
Find the valency of the element which is underlined in the following formula.
- NaCl
- CO2
- Al (PO4)
- Ba (NO3)2
- CaCl2
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.
