Advertisements
Advertisements
प्रश्न
Write the formula of the following compound:
Zinc oxide
उत्तर
Zinc oxide - ZnO - `"Zn"^(2+)["O"]^(2-)`
APPEARS IN
संबंधित प्रश्न
What is meant by the term chemical formula?
Write down the formulae for the following compounds :
Calcium oxide
An element Z has a valency of 3. What is the formula of oxide of Z ?
Name the following compounds. Also write the symbols/formulae of the ions present in them :
- CuSO4
- (NH4)2SO4
- Na2O
- Na2CO3
- CaCl2
Define ‘formula unit’ of an ionic compound. What is the formula unit of (i) sodium chloride, and
(ii) magnesium chloride ?
Fill in the blank:
Formula of iron (ill) carbonate is _____ .
Give the empirical formula of Glucose C6H12O6 .
Write the formula of the following compound:
Calcium hydroxide
Write the formula of the following compound:
Zinc nitrate
Write the formula of the following compound:
Zinc oxide
Write the formula of the following compound:
Lead [II] sulphate
Write the formula of the following compound:
Silver [I] chloride
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
(NH4)3SO4
State of the following formula of a compound is incorrect. Incorrectly write the correct formula.
KNO3
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
Aluminium (III) nitrate
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 |
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.
