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Standard VIII
Chemistry
Crystals of Salts
State the col...
Question

State the colour of the following substances -:

  • Silver chloride -
  • Copper nitrate -
  • Lead nitrate -
  • Nitrogen dioxide-
  • Silver bromide -
  • Ferrous sulphate-

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Solution

1) Silver Chloride - White

2) Copper Nitrate- Blue

3) Lead Nitrate- White

4) Nitrogen Dioxide- Reddish brown

5) Silver Bromide- pale yellow

6) Ferrous sulphate- blue green


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Q. Given below are word equations. Convert them into chemical equations using symbols and valencies. Balance the equations. Use appropriate signs for gases and precipitates in the reaction.
i) Zinc Sulphide + Oxygen gas → Zinc oxide solid + Sulphur dioxide gas
ii) Silver nitrate solution + Sodium chloride solution → Silver chloride precipitate + Sodium nitrate solution
iii) Sulphur solid + Concentrated nitric acid → Sulphuric acid + Nitrogen dioxide gas + Water
iv) Barium chloride Solution + Potassium sulphate Solution → Barium sulphate Precipitate + Potassium chloride solution
v) Silver nitrate on heating→ silver metal + nitrogen dioxide gas + Oxygen gas.
vi) Aluminium hydroxide + Nitric acid → Aluminium nitrate + Water.
Q. Write a balanced chemical equation with the help of chemical symbols and formulas for the following reactions:

(i) Zinc + Silver nitrate ⟶ Zinc nitrate + Silver

(ii) Copper oxide + Hydrogen ⟶ Copper + Water

(iii) Barium chloride + Aluminium sulphate ⟶ Barium sulphate + Aluminium chloride
Q. Beakers A, B, and C contain zinc sulphate, silver nitrate, and ferrous sulphate solutions respectively. Copper pieces are added to each beaker. Blue colour appears in the case of ___.
Q. Choose the reactions which are not feasible.
I. Iron + Zinc sulphate → Iron sulphate + Zinc
II. Magnesium + Silver nitrate → Magnesium nitrate + Silver
III. Copper + dil. sulphuric acid → Copper sulphate + H2
IV. Zinc + Ferrous sulphate → Iron + Zinc sulphate
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