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Standard IX

Chemistry

Formula Mass

An unknown sa...

Question

An unknown sample weighing 1.5g was found to contain only Mn and S.The sample was completely reacted with oxygen and it produced 1.22g of Mn(||)oxide and 1.38 g of SO3 what is the simplest formula for this compound.

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Q. An unknown sample weighing 1.5 g was found to contain only

M n

and

S

. The sample was completely reacted with oxygen and it produced 1.22 g of

M n (I I)

oxide and 1.38 g of

S O_{3}

. What is the simplest formula for this compound?

A sample of 12g of coke was heated till it underwent complete combustion. Carbon dioxide gas thus formed was collected and was found to weigh 44 g. Calculate the mass of oxygen consumed during this reaction.

12

g of an impure sample of arsenious oxide was dissolved in water containing

7 .5

g of sodium bicarbonate and the resulting solution was diluted to

250

mL.

25

mL of this solution was completely oxidized by

22.4

mL of solution of iodine.

25

mL of this iodine solution reacted with same volume of a solution containing

24.8

g of sodium was completely oxidized by

22.4 m L

of a solution thiosulphate

(N a_{2} S_{2} O_{3} 5 H_{2} O)

in one litre. Calculate the percentage of arsenious oxide in the sample. (Atomic mass of

A s = 75

)

12 g

of an impure sample of arsenious oxide was dissolved in water containing

7.5 g

of sodium bicarbonate and the resulting solution was diluted to

250 m L

25 m L

of this solution was completely oxidised by

22.4 m L

of a solution of iodine.

25 m L

of this iodine solution reacted with same volume of a solution containing

24.8 g

of sodium thiosulphate solution

(N a_{2} S_{2} O_{3} \cdot 5 H_{2} O)

in one litre. Calculate the percentage of arsenious oxide in the sample. (Atomic mass of

A s = 75)

12.0

of an impure sample of arsenious oxide

(A s_{2} O_{3})

was dissolved in water containing

7.5

g of sodium bicarbonate

(N a H C O_{3})

and the resulting solution was diluted to

250

mL.

25

mL of this solution was completely oxidised by

22.4

mL of a solution of

I_{2}

25

mL of this solution reacted with the same volume of a solution containing

24.8

g of

N a_{2} S_{2} O_{3} \cdot 5 H_{2} O

1 L

. The percentage of

A s_{2} O_{3}

in the sample is :

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