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प्रश्न
Write the formula of the following compound:
Zinc nitrate
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उत्तर
Zinc nitrate - Zn[NO3]2 - `"Zn"^(2+)["NO"_3]^(1-)`
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संबंधित प्रश्न
What is meant by a chemical formula ? Write the formulae of one element and one compound.
An element Y has a valency of 4. Write the formula for its :
- chloride
- oxide
- sulphate
- carbonate
- nitrate
Correct the following statement:
A molecular formula represents an element.
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 |
Name the element in the compound and give the formula of the following compound:
Phosphoric acid
Write the formula of the following compound:
Sodium permanganate
Write the formula of the following compound:
Calcium hydroxide
Write the formula of the following compound:
Iron [II] sulphate
Write the formula of the following compound:
Iron [III] sulphate
Write the formula of the following compound:
Iron [III] hydroxide
Write the formula of the following compound:
Lead [II] oxide
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
NaCO3
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?
Which of the following represents a correct chemical formula? Name it.
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-`
Complete the following crossword puzzle (Fig. 3.1) by using the name of the chemical elements. Use the data given in Table.
| Across | Down | ||
| 2 | The element used by Rutherford during his α–scattering experiment | 1 | A white lustrous metal used for making ornaments and which tends to get tarnished black in the presence of moist air |
| 3 | An element which forms rust on exposure to moist air | 4 | Both brass and bronze are alloys of the element |
| 5 | A very reactive non–metal stored under water | 6 | The metal which exists in the liquid state at room temperature |
| 6 | Zinc metal when treated with dilute hydrochloric acid produces a gas of this element which when tested with burning splinter produces a pop sound. | 8 | An element with symbol Pb |
What is a chemical formula?
