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Write sqauential observation for effect of heat on Copper nitrate.
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State what do you observe when ammonium hydroxide to Iron (III) sulphate solution.
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From the formulae listed below, Choose, one, corresponding to the salt having the given description:
AgCl, CuCO3, CuSO4.5H2O, KNO3, NaCl, NaHSO4, Pb(NO3)2, ZnCO3, ZnSO4, 7H2O.
On heating this, salt changes from green to black.
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How would you distinguish between Zn2+ and Pb2+ using ammonium hydroxide solution?
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Write the observation for the following:
NaOH is added drop-wise till in excess to a solution of zinc sulphate.
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Write the observation for the following :
NH4OH is added first in a small quantity and then in excess to a solution of copper sulphate.
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Write the observation for the following:
Excess NH4OH is added to a substance obtained by adding hydrochloric acid in silver nitrate solution.
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What would you observe in the following cases:
Ammonium hydroxide is first added in a small quantity and then in excess to a solution of copper sulphate.
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The following table shows the tests a student performed on four different aqueous solutions which are X,Y,Z and W. Based on the observations provided, Identify the cation present
|
Chemical Test |
Observation | Conclusion |
| To Solution X, ammonium hydroxide is added in minium quantity first and then in excess | A dirty white precipitate is formed which dissolves in excess to form a clear solution | (i) |
| To Solution Y, ammonium hydroxide is added in minimum quantity first and then in excess | A pale blue precipitate is formed which dissolves in excess to form a clear inky blue solution | (ii) |
| To solution W, A small quantity of sodium hydroxide solution is added and then in excess | A white precipitate is formed which remains insoluble | (iii) |
| To a salt Z, calcium hydroxide solution is added and then heated | A pungent smelling gas turning moist red litmus paper blue is obtained | (iv) |
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State the inference drawn from the following observation:
Salt S is prepared by reacting dilute sulphuric acid with copper oxide Identify S.
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Identify the cation of the following case:
NaOH solution when added to solution (A) gives a reddish brown precipitate
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Identify the cation of the following case:
NH4OH solution when added to solution (B) gives white ppt. which does not dissolve in excess.
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Identify the cation of the following case:
NaOH solution when added to solution (C) gives white ppt. which insoluble in excess.
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What is the difference between the chemical nature of an aqueous solution of HCl and an aqueous solution of NH3
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Explain the following method with example.
Direct combination
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Explain the following:
H3PO3 is not a tribasic acid.
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Explain the following:
Nitrogen dioxide is a double acid anhydride.
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Fill in the blanks with suitable words:
An acid is a compound which when dissolved in water forms hydronium ions as the only ______ ions. A base is a compound which is soluble in water and contains ______ ions. A base reacts with an acid to form a ______ and water only. This type of reaction is known as ______.
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Explain why Anhydrous FeCl3 cannot be prepared by heating hydrated iron (III) chloride.
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For each of the salt: A, B, C and D, suggest a suitable method of its preparation.
A is a sodium salt.
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