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X, Y and Z are three crystalline solids which are soluble in water and have a common anion.

To help you to identify X, Y and Z, you are provided with the following experimental observation.

When Z is heated it leaves no residue. Warming Z with sodium hydroxide solution liberates a gas which turns moist red litmus paper blue.

INFERENCE: Z contains the __________ cation.


A

Na+

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B

K+

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C

Zn2+

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D

Fe2+

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E

Al3+

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F

Ca 2+

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G

Fe3+

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H

Pb2+

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I

Cu2+

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J

Fe2+

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K

Mg2+

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L

NH4+

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Solution

The correct option is K

NH4+


NH4+


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