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Calcination

48. The compo...

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48. The composition of KClO3(s) takes place- KClO3→ KCl+O2 ↓ KClO4+KCl . If 2gm sample of KClO3 on complete decomposition gives 224ml of O2 at STP, then calculate percentage by mass of KCl in the residue.

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Q. 1.225 g sample of

K C l O_{3}

was heated under such conditions that a part of it decomposed according to the equations given below. If the amount of

O_{2}

evolved was 168 mL at STP, calculate the weight of

K C l O_{4}

(Molar mass of K C l O_{3} = 122.5 g m o l^{- 1}, K C l O_{4} = 138.5 g m o l^{- 1}) K C l O_{3} \to K C l + O_{2} K C l O_{3} \to K C l O_{4} + K C l

Q. Calculate the percent loss in weight after complete decomposition of a pure sample of potassium chlorate,

K C l O_{3} (s) \to K C l (s) + O_{2} (g)

Q. The decomposition of

K C l O_{3}

K C l

O_{2}

on heating is an example of:

1.0

K C l O_{3}

was heated under such conditions that a part of it decomposed according to the equation:

2 K C l O_{3} \to 2 K C l + 3 O_{2}

,
and the remaining underwent change according to the equation:

4 K C l O_{3} \to + 3 K C l O_{4} + K C l

.
If the amount of

O_{2}

146.8

mL at STP, calculate the percentage by weight of

K C l O_{4}

in the residue.

Q. Oxygen is prepared by catalytic; decomposition of potassium chlorate

(K C l O_{3})

. Decomposition, of potassium chlorate gives potassium chloride

(K C l)

(O_{2})

. How many moles and how many grams of

K C l O_{3}

are required to produce 2.4 mole

O_{2}

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