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Q289) In the preparation of KMnO4 pyrolusite ( MnO2) is first converted to potassium manganate ( K2MnO4). In this conversion, the oxidation state of manganese changes from [ kerala CEE 2001]




SOLUTION


Answer: (d)


Q290) In the extraction of silver from argentite ore, the ore is treated with dilute solution of NaCN in water in the presence of Y, whereby the following reaction takes place
Ag2X + 4NaCN + 2Y → 2Na[Ag(CN)] + Na2XO4
X and Y in this reaction are represented by [ SCRA 2001]




SOLUTION


Answer: (b)


Q291) What is the shape of Fe(CO)5 molecule? [ CBSE PMT 2000]



SOLUTION

Fe undergoes sp3d hybridization giving a trigonal bipyramidal shape
Answer:(c)



Q292) Which of the following gives blood red colour with KCNS? [ DEC 2000]



SOLUTION

Fe3+ + 3SCN- → Fe(SCN)3 ( blood red colour)
Answer: (b)


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