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An aqueous solution of BaBr2 give yellow ppt with:
A.K2CrO4
B.AgNO3
C.Both (a) and (b)
D.None of these

Answer
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Hint: Precipitation reaction is defined as the formation of insoluble salts when two solutions containing soluble salts combine. The insoluble salts known as precipitate. Precipitation reaction can help to determine the presence of various ions in solution. Some examples of precipitation are rain, hail, sleet and snow.

Complete step by step answer:
First we will discuss about the chemical which is given in question,
Barium bromide is the chemical compound with formula BaBr2. It is dissolved in water and is toxic. The barium bromide can be prepared by treating barium sulphate and barium carbonate with hydrobromic acid.
Then Barium bromide is treated with aqueous solution and heated at 1200C to form anhydrous salt.
Potassium dichromate an inorganic compound with formula K2CrO4. It is also known as dipotassium monochromate or potassium chromate. It is soluble in water and used as oxidizing agents. It appears as a crystalline solid which is yellow in colour. It has no smell and better taste. When potassium chromate is heated it emits chromatic fumes that are toxic.
Silver nitrate is an inorganic compound with formula AgNO3 . It is far less sensitive to light than the halide. It can be prepared when silver reacts with nitric acid, as a result silver nitrate, water and oxide of nitrogen is formed.
Now we will discuss about the chemical reaction,
Barium bromides is aqueous solution and when potassium dichromate is reacted with barium bromide gives yellow ppt of barium chromate.
K2CrO4+BaBr2BaCrO4+2KBr
Potassium dichromate +barium bromide → barium chromate +potassium bromide
Second, when barium bromide is reacted with silver nitrate gives light yellow ppt of silver bromide.
2AgNO3+BaBr2Ba(NO3)2+2AgBr
According to the reaction, option C is correct.


Note:
Precipitation reaction can be used for the qualitative inorganic analysis. It can be used for making pigments and removing metal ions from aqueous solution. Precipitation may also occur when an antisolvent (a solvent in which the product is insoluble) is added, reducing the solubility of the desired product.