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The D-And-f-Block Elements

Question
CBSEENCH12011126
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Which of the following does not give oxygen on heating?

  • KClO3

  • Zn(ClO3)2

  • K2Cr2O7

  • (NH4)2Cr2O7

Solution

D.

(NH4)2Cr2O7

Oxygen-rich compounds like chlorate perchlorate K2Cr2O7 etc. When heated gives oxygen but ammonium dichromate gives nitrogen gas when heated. 
2 KClO subscript 3 space rightwards arrow with increment on top space 2 KCl space plus 3 straight O subscript 2 space upwards arrow 2 Zn left parenthesis ClO subscript 3 right parenthesis subscript 2 space rightwards arrow with increment on top space ZnCl subscript 2 space plus 3 straight O subscript 2 space upwards arrow 4 straight K subscript 2 Cr subscript 2 straight O subscript 7 space rightwards arrow with increment on top space 4 straight K subscript 2 CrO subscript 4 space plus 2 Cr subscript 2 straight O subscript 3 space plus 3 straight O subscript 2 space bold upwards arrow left parenthesis NH subscript 4 right parenthesis subscript 2 Cr subscript 2 straight O subscript 7 space rightwards arrow with increment on top space straight N subscript 2 space upwards arrow plus Cr subscript 2 straight O subscript 3 space plus 4 straight H subscript 2 straight O

Some More Questions From The d-And-f-Block Elements Chapter

Explain why Cu+ ion is not stable in aqueous solutions?

Actinoid contraction is greater from element to element than lanthanoid contraction. Why?

On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?

The outer electronic configuration of copper is 3d10 4s1, yet it is considered transition element. Why?

Why the melting points of transition elements are high?

Why Zn, Cd and Hg are not regarded as transition elements?

Name the first element of 3rd transition series.

Though copper, silver and gold have completely filled sets of d-orbitals yet they are considered as transition metals. Why?

Why are transition elements so named?

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