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प्रश्न
Give the empirical formula of Acitic Acid CH3COOH.
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उत्तर
The empirical formula for acetic acid is CH2O.
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संबंधित प्रश्न
Write down the formulae of sodium sulphide.
Fill the following blanks with suitable words :
In a chemical reaction, the sum of the masses of the reactants and the products remains unchanged. This is called ....................
What is meant by the symbol of an element ? Explain with examples.
An element Z has a valency of 3. What is the formula of oxide of Z ?
An element Y has a valency of 4. Write the formula for its :
- chloride
- oxide
- sulphate
- carbonate
- nitrate
Give the formula and valency of:
chromate ………….…….. .
Give the formula and valency of:
cupric ………………… .
Write chemical formula of the sulphate of Aluminium, Ammonium and Zinc.
Fill in the blank:
Formula of iron (ill) carbonate is _____ .
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:
Potassium bicarbonate
Write the formula of the following compound:
Calcium bicarbonate
Write the formula of the following compound:
Magnesium chloride
Write the formula of the following compound:
Zinc oxide
Write the formula of the following compound:
Aluminium hydroxide
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
Mg(SO4)2
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-`
Play a game for writing formula.
Example 2: A low-cost model for writing formulae: Take empty blister packs of medicines. Cut them in groups according to the valency of the element, as shown in the figure. Now, you can make formulae by fixing one type of ion into other.
For example:
The formula for sodium sulphate:
2 sodium ions can be fixed on one sulphate ion.
Hence, the formula will be Na2SO4.
Do it yourself:
Now, write the formula of sodium phosphate.
