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प्रश्न
Choose the correct answer from the options given below:
Anhydrous iron(III) chloride is prepared by:
1) direct combination
2) simple displacement
3) decomposition
4) neutralization
उत्तर
Direct combination
Anhydrous FeCl3 cannot be prepared by simply heating hydrated ferric chloride FeCl3.6H2O, because, on heating, FeCl3.6H2O produces Fe2O3, H2O, and HCl.
2[FeCl3.6H2O] 
Fe2O3 + 9H2O + 6HCl
Direct combination of elements means heating two elements together
Metal + Nonmetal → Salt (Soluble / Insoluble)
2Fe + 3Cl2 → 2FeCl3
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संबंधित प्रश्न
Give an example of a metal which is the best conductor of heat.
Write ‘True’ or ‘False’ in front of following statement.
Stainless steel is used for making power transmission wires.
Name a gaseous non-metal,. having greenish yellow colour.
Select from the following ist:
`Fe_2O_3, , NO, PbO, Mn_2O_7`
Acidic oxide ………………
Name:
two metals which are soft
The table below compares some properties of metals and non-metals. Write down the missing
statements (i) to (iv) :
| Metals | Non-metals |
| (i) ………………….. | Poor conductors of heat |
| (ii) Malleable | …………………… |
| (iii) Form positive ions | …………………… |
| (iv) ………………… | Form acidic oxides |
Name two metalloids.
Distinguish between the physical properties of metals and non-metals with reference to:
(a) lusture (b) malleability (c) ductility (d) tensile strength (e) sonority (f) conduction of heat and electricity (g) melting and boiling point (h) density.
With reference to the physical properties of metals and non-metals, state the following exception.
A metal which floats on water.
Give reason for the following:
Potassium reacts vigorously with cold water while copper does not react with water or steam.
