A white-coloured inorganic compound, on heating, gives a gas which turns lime water milky and residue is left which is yellow when hot and turns white on cooling. The compound is

P b (N O_{3})_{2}

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P b C O_{3}

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B a C O_{3}

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Z n C O_{3}

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Solution

The correct option is B $Z n C O_{3}$
Pure ZnO is a white powder crystalline. Zinc oxide is thermochromic, changing from white to yellow when heated in air and reverting to white on cooling.

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Q. A white solid

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A white coloured inorganic salt gives the following reactions.

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The solution turns black in presence of $H_{2} S$
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A white amorphous powder (A) when heated gives a colourless gas (B), which turns lime water milky and the residue (C) which is yellow when hot but white when cold. The residue (C) dissolves in dilute HCl and the resulting solution gives a white precipitate on addition of potassium ferrocyanide solution. (A) dissolves in dilute HCl with the evolution of a gas which is identical in all respects with (B). The solution of (A) as obtained above gives a white precipitate (D) on addition of excess of

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. Another portion of this solution gives initially a white precipitate (E) on addition of NaOH which dissolves in excess of it. Compounds (A) to (D) are identified as:

A white coloured inorganic salt gives the following reactions.

iii) The salt when heated gives acetone and a yellow coloured residue. Identify the salt (A) and give chemical reactions.

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A white-coloured inorganic compound, on heating, gives a gas which turns lime water milky and residue is left which is yellow when hot and turns white on cooling. The compound is

The correct option is B ZnCO3Pure ZnO is a white powder crystalline. Zinc oxide is thermochromic, changing from white to yellow when heated in air and reverting to white on cooling.

The correct option is B $Z n C O_{3}$
Pure ZnO is a white powder crystalline. Zinc oxide is thermochromic, changing from white to yellow when heated in air and reverting to white on cooling.