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प्रश्न
A silvery-white metal X taken in the form of ribbon, when ignited, burns in air with a dazzling white flame to form a white powder Y. When water is added to powder Y, it dissolves partially to form another substance Z.
(a) What could metal X be?
(b) What is powder Y?
(c) With which substance metal X combines to form powder Y?
(d) What is substance Z? Name one domestic use of substance Z.
(e) Write a balanced chemical equation of the reaction which takes place when metal X burns in air to form powder Y.
उत्तर
(a) Metal X could be magnesium metal.
(b) Powder Y is magnesium oxide (MgO).
(c) Magnesium metal (X) combines with oxygen gas to form powdery magnesium oxide (Y).
(d) Substance Z is magnesium hydroxide [Mg(OH)2]. Suspension of magnesium hydroxide (Z) is used as an antacid.
(e) 2Mg (s) + O2 (g) → 2MgO (s)
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संबंधित प्रश्न
When crystals of copper sulphate are strongly heated, the residue obtained is ___________.
(A) red in colour
(B) blue in colour
(C) green in colour
(D) colourless
What type of chemical reaction is represented by the following equation?
A + B → C
Fill in the blank
A reaction in which two or more substances combine to form a single substance is called a ............ reaction.
Fill in the blank
The chemical reaction between hydrogen and chlorine is a ................ reaction
Calcium oxide reacts vigorously with water to produce slaked lime.
\[\ce{CaO{(s)} + H2O(l) -> Ca(OH)2(aq)}\]
This reaction can be classified as:
(A) Combination reaction
(B) Exothermic reaction
(C) Endothermic reaction
(D) Oxidation reaction
Select the correct answer for the statement given below:
The product formed during direct combination reaction of carbon dioxide and water.
Give a balanced equation for the following type of reaction:
A reaction of direct combination i.e. synthesis in which twp gases combine to give another gas – which turns lime water milky.
Explain the following reaction with their balanced chemical equation.
Ammonia gas reacts with hydrogen chloride.
Balance the following chemical equation and identify the type of chemical reaction.
`"Mg"("s") + "Cl"_2("g") -> "MgCl"_2("s")`
- Assertion: Rusting of Iron is endothermic in nature.
- Reason: As the reaction is slow, the release of heat is barely evident.
