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प्रश्न
Identify the following substance:
Gas B that has an offensive smell as of rotten eggs.
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उत्तर
Hydrogen sulphide
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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.
An element Z has a valency of 3. What is the formula of oxide of Z ?
Work out the formula for sulphur dioxide. (Valencies : S = 4 ; O = 2)
If the valency of carbon is 4 and that of sulphur is 2, work out the formula of the compound formed by the combination of carbon with sulphur. What is the name of this compound ?
Identify the following substance:
Gas C that is colourless and can be used as a bleaching agent.
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 hydroxide
Write the formula of the following compound:
Potassium iodide
Write the formula of the following compound:
Sodium chloride
Write the formula of the following compound:
Sodium bisulphite
Write the formula of the following compound:
Zinc nitrate
Write the formula of the following compound:
Aluminium oxide
Write the formula of the following compound:
Iron [III] sulphate
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
Mercury (II) chloride
Write the molecular formulae of all the compounds that can be formed by the combination of the following ions
Cu2+, Na+, Fe3+, C1– , `"SO"_4^-2`, `"PO"_4^3-`
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
