The oxidation number of iron in Fe(CO)3 is
Oxidation state of Fe = x (let)
∴ x + 5 × 0 = 0
Because CO is neutral molecule.
Oxidation state of Fe = x (let)
∴ x + 5 × 0 = 0
Because CO is neutral molecule.
CTET Solved Paper MCQ - UPTET December 2016 Paper2
Temporary hardness of water is because of the presence of bicarbonate of calcium and magnesium. It can be easily removed by just boiling and filtering the water.
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The value of 
is
is
∠DAC = 320 and ∠AOB = 700 (given)
∠BOC + ∠AOB = 1800 [∵ Liner pair]
⇒ ∠BOC + 700 = 1800
⇒ ∠BOC = 1800 - 700 = 1100
∠ACB = ∠DAC [∵ Alternate angles between the parallel lines]
⇒ ∠ACB = 320 [∵ ∠DAC = 320 (given)]
or ∠OCB = 320
Now, in △OCB, ∠OCB + ∠BOC + ∠OBC = 1800 [∵ Angle sum property of a triangle]
⇒ 320 + 1100 + ∠OBC = 1800
⇒ ∠OBC = 1800 - (1100 + 320)
⇒ ∠OBC = 380 = x
