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1
Which of the following is a displacement reaction ?
2
In Neutralisation reaction acid reacts with a base to form salt and water and a lot of heat energy is given out. This reaction is :
An exothermic physical change
An endothermic chemical change
An exothermic chemical change
An endothermic physical change
3
Before burning, why is Magnesium ribbon rubbed with sand paper ?
To remove dust.
To remove the layer of magnesium carbonate.
To smoothen it.
To remove the layer of magnesium oxide.
4
The substances which prevent oxidation of food are called ______________
Oxidants
Reductants
Antioxidants
Decomposers
5
Which of the following gas is used in the bags of chips to prevent them from getting oxidised ?
Hydrogen
Oxygen
Nitrogen
Carbon dioxide
6
Which of the following hypothetical reactions can be called a combination reaction?
a+bcab+c
abcab+c
a+b ab
ab a+b
7
A chemical reaction in which two or more substances (reactants) combine to form a new substance ( product) is called _________________.
Decomposition Reaction
Combination Reaction
Thermal Reaction
None of these .
8
The reaction is a
Decomposition reaction
Combination reaction
Double displacement reaction
Displacement reaction
9
Which of the following compound of Iron is produced during the displacement reaction between Iron and Copper Sulphate?
Iron oxide
Iron sulphide
Iron sulphate
Iron sulphite
10
Take a small quntity of copper sulphate crystals and dissolve it in a small quantity of water to obtain blue coloured solution. Add a few drops of dilute sulphuric acid. Now, put 3 - 5 medium sized iron nails in it, soon the colour of blue solution changes to green and a brown deposite appears on the iron nails. Change of colour from blue to green in the above activity represents :
Physicaly change
Chemical change
Both of the above
None of these
11
Consider the following reaction: Which of the following is getting oxidised in this reaction?
Manganese
Chlorine
Hydrochloric acid
Magnesium oxide
12
The shiny finish of a building wall is due to which of the following reactions ?
13
Quick lime give slaked lime on reaction with water. What is the physical state of quick lime and slaked lime in this reaction?
Solid, solid
Solid, gaseous
Solid, aqueous
Liquid, aqueous
14
Which of the followig will decompose to form a yellow product emitting brown fumes?
Silver chloride
Ferrous sulphate
Calcium carbonate
Lead nitrate
15
In which of the following double displacement reactions, precipitates are not formed?
Reaction of barium chloride with sodium sulphate
Reaction of lead(ll) nitrate with potassium iodide
Reaction of hydrochloric acid with sodium hydroxide
Reaction of lead (ll) nitrate with sodium chloride