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प्रश्न
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
NaZnO2
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उत्तर
NaZnO2
Correct formula – Na2ZnO2
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संबंधित प्रश्न
What is meant by a chemical formula ? Write the formulae of one element and one compound.
If the valency of hydrogen is 1 and that of nitrogen is 3, work out the formula for ammonia.
An element B shows valencies of 4 and 6. Write the formulae of its two oxides.
Give the formulae of the compounds formed from the following sets of elements :
- calcium and fluorine
- hydrogen and sulphur
- nitrogen and hydrogen
- carbon and chlorine
- sodium and oxygen
- carbon and oxygen
Which of the following represents a correct chemical formula ?
Give the empirical formula of Acetylene C2H2
Identify the following substance:
Gas B that has an offensive smell as of rotten eggs.
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:
Nitric acid
Name the element in the compound and give the formula of the following compound:
Green vitriol
Write the formula of the following compound:
Potassium dichromate
Write the formula of the following compound:
Sodium iodide
Write the formula of the following compound:
Calcium bisulphite
Write the formula of the following compound:
Copper [II] oxide
Write the formula of the following compound:
Copper [II] sulphate
Write the formula of the following compound:
Iron [II] chloride
Write the formula of the following compound:
Iron [III] hydroxide
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
NaCO3
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.
