Name: (a) A Black metallic oxide which reacts with hydrochloric acid to give a coloured solution.

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Solution

The black metallic oxide is copper oxide $(C u O)$ which reacts with HCL to give a coloured solution of copper chloride.

Reaction involved:
$C u O + 2 H C L ⟶ C u C l_{2} + H_{2} O$
Colour of $C u C l_{2}$ solution is blue.

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(a) Name one metal which reacts with dilute hydrochloric acid to produce hydrogen gas.

(b)Name one metal which does not react with dilute hydrochloric acid.

Q. Hydrochloric acid reacts with a metal X to form a gas Y which burns with a 'pop' sound. Sodium hydroxide solution also reacts with the same metal X (on heating) to form the same gas Y.
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(ii) Drying agent used to dry hydrogen chloride.
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(xiii) A metallic oxide which reacts with hydrochloric acid to give a coloured solution.
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Name
(a) a black metallic oxide which reacts with hydrochloric acid to give a coloured solution.
(b) two colourless gases, which when mixed produce a white solid.
(c) two gases which chemically combine to form a liquid.
(d) a chloride which is soluble in excess of ammonium hydroxide.
(e) the chemical in which gold can be dissolved.
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The metal X reacts with dilute hydrochloric acid to form a gas Y.The metal X also reacts with sodium hydroxide solution (on heating) to form the same gas Y.When a lighted matchstick is applied,this gas burns by producing a 'pop' sound.

(a) Name two metals which could behave like X.

(b) Name the gas Y.

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Standard X Chemistry

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Name:​ (a) A Black metallic oxide which reacts with hydrochloric acid to give a coloured solution.

The black metallic oxide is copper oxide (CuO) which reacts with HCL to give a coloured solution of copper chloride. Reaction involved: CuO+2HCL⟶CuCl2+H2O Colour of CuCl2 solution is blue.

Name: (a) A Black metallic oxide which reacts with hydrochloric acid to give a coloured solution.

The black metallic oxide is copper oxide $(C u O)$ which reacts with HCL to give a coloured solution of copper chloride.

Reaction involved:
$C u O + 2 H C L ⟶ C u C l_{2} + H_{2} O$
Colour of $C u C l_{2}$ solution is blue.