Advertisements
Advertisements
प्रश्न
Explain the terms with examples.
Combination reaction
उत्तर
Combination reaction:
Those reactions in which two or more substances combine to form single substance is called combination reaction
For example : Magnesium and oxygen combine, when heated, to form magnesium oxide.
APPEARS IN
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
Find the odd man out:
Camphor, Ammonium Chloride, Naphthalene balls, Sugar
One of the following is an endothermic reaction. This is:
(a) combination of carbon and oxygen to form carbon monoxide
(b) combination of nitrogen and oxygen to form nitrogen monoxide
(c) combination of glucose and oxygen to form carbon dioxide and water
(d) combination of zinc and hydrochloric acid to form zinc chloride and hydrogen
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?
CaO + H2O → Ca(OH)
What type of reaction is represented by the following equation?
2 Ca + O2 → 2CaO
What type of chemical reaction take place when a magnesium wire is burnt in air?
What type of chemical reaction take place when ammonia and hydrogen chloride are mixed?
What type of chemical reaction is represented by the following equation?
A + B → C
what tpye of reaction is the following:
2K + Cl → 2KCl
What type of reaction is represented by the following equation?
CaO + CO2 → CaCO3
Give one example of a combination reaction which is also endothermic.
Consider the following equation of the chemical reaction of a metal M:
4M + 3O2 → 2M2O3
This equation represents:
(a) combination reaction as well as reduction reaction
(b) decomposition reaction as well as oxidation reaction
(c) oxidation reaction as well as displacement reaction
(d) combination reaction as well as oxidation reaction
What do you understand by a chemical bond ?
Give one example each of which illustrates the following characteristics of a chemical reaction:
change of colour
What do you observe when solid lead nitrate is heated?
What do you observe when when dilute sulphuric acid is added to barium chloride solution ?
What are chemical combination or synthesis reactions ? Chemical combination or synthesis:
Define: Chemical combination reaction
Classify the following reaction into different type:
CaO(s) + H2O(l) → Ca(OH)2(aq)
Give a balanced equation for –
A direct combination reaction involving two elements, one of which is a non-metal
Which changes occur during chemical changes?
H2(g) + Cl29(g) → 2HCl(g) is a ______
Define a combination reaction. Give one example of an exothermic combination reaction.
Which of the following are exothermic processes?
(i) Reaction of water with quick lime
(ii) Dilution of an acid
(iii) Evaporation of water
(iv) Sublimation of camphor (crystals)
Which of the following is not a physical change?
Combustion reactions are always ____________.
In which of the following chemical equations, the abbreviations represent the correct states of the reactants and products involved at reaction temperature?
The chemical reaction between copper and oxygen can be categorized as ______.
Identify the types of chemical reactions occurring during the combustion of fuel:
Balance the following chemical equation and identify the type of chemical reaction.
`"Mg"("s") + "Cl"_2("g") -> "MgCl"_2("s")`
A clear solution of slaked lime is made by dissolving Ca(OH)2 in an excess of water. This solution is left exposed to air. The solution slowly goes milky as a faint white precipitate forms. Explain why a faint white precipitate forms, support your response with the help of a chemical equation.
