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Colour and Solubility

X, Y and Z ar...

Question

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.

Na⁺

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K⁺

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Zn²⁺

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Fe²⁺

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Al³⁺

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Ca ²⁺

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Fe³⁺

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Pb²⁺

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Cu²⁺

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Fe²⁺

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Mg²⁺

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NH₄⁺

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Solution

The correct option is L
NH₄⁺

NH₄⁺

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Similar questions

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 observations. Copy and complete the corresponding inferences in (a) to (e).

(a) A reddish-brown gas is obtained when X, Y and Z are separately warmed with concentrated sulphuric acid and copper turning added to the mixture.

INFERENCE 1 : The common anion is the .................. ion.

(b) When X is heated, it melts and gives off only one gas which re-lights a glowing splint.

INFERENCE 2 : The cation in X is either ................ or ....................

(c) The action of heat on Y produces a reddish-brown gas and a yellow residue which fuses with the glass of the test tube.

INFERENCE 3 : The metal ion present in Y is the .................... ion.

(d) 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 4 : Z contans the ............ cation.

(e) Write the equations for the following reactions:

(1) X and concentrated sulphuric acid (below $200^{\circ}$ ). (One equation only for either of the cations given in INFERENCE 2).

(2) Action of heat on Y.

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INFERENCE : The common anion is the..........ion.

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

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