Advertisements
Advertisements
प्रश्न
A metal ribbon 'X' bums in oxygen with a dazzling white flame forming a white ash 'Y'. The correct description of X, Y and the type of reaction is:
विकल्प
X = Ca; Y = CaO;
Type of reaction = Decomposition
X = Mg; Y = MgO;
Type of reaction = Combination
X = Al; Y = Al2O3;
Type of reaction = Thermal decomposition
X = Zn; Y = ZnO;
Type of reaction = Endothermic
उत्तर
X = Mg; Y = MgO;
Type of reaction = Combination
Explanation:
In this reaction, magnesium and oxygen combine to create magnesium oxide.
\[\ce{2Mg + O_2 ->2MgO}\]
APPEARS IN
संबंधित 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.
What type of reaction is represented by the following equation?
2 Ca + O2 → 2CaO
Give one example of a combination reaction which is also exothermic.
When hydrogen burns in oxygen, water is formed and when water is electrolysed, then hydrogen and oxygen are produced. What type of reaction takes place:
(a) in the first case?
(b) in the second case
Define a chemical reaction.
What do you understand by a chemical bond ?
What do you observe when solid lead nitrate is heated?
What effect does an increase in concentration of H+ (aq.) in a solution have on the pH of solution?
State why a direct combination reaction is called a – ‘synthesis reaction’.
Complete the statement by filling in the blank with the correct word:
Direct combination reaction of phosphorus pentoxide with water gives _______.
