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WorksheetsChapter 1 (Chemical Reactions and Equation)
Total questions: 20
Worksheet time: 20mins
Magnesium ribbon burns with which coloured flame in presence of air ?
Brighting white
Bright blue coloured
A bright purple
Bright green
Burning of coal is a which type of process ?
Combination
Double displacement
Displacement
Decomposition
Which are more active elements than copper ?
Iron and Aluminium
Sodium and Magnesium
Zinc and Aluminium
Zinc and Lead
If one reactant is oxidised and other reactant is reduced during chemical reaction, which type of
reaction is that ?
Electrolysis
Thermal decomposition
Redox
Reduction
If a metal surface fades due to attack of moisture, acid etc. This reaction is called ...........
Corrosion
Rancidity
Oxidation
Reduction
Which is the balance equation of Al + HCl → AlCl₃ +H₂ ?
Al + HCl → AlCl₃ + 2H₂
2Al + 6HCl → 2AlCl₃ + 3H₂
2Al + 3HCl → 2AlCl₃ + 2H₂
2Al + 4HCl → 3AlCl₃ + 3H₂
Chemically, rusting is ...........
Hydrated ferrous oxide
Ferric oxide
Hydrated ferric oxide
None of these
For Reaction : CuO + H₂→Cu + H₂O which statement is correct ?
CuO is an oxidising agent
H₂ is oxidising
This reaction is a displacement reaction
All of the given
By which symbol aqueous state of reactants and products are shown in a chemical equation ?
l
aq
g
lq
In whose presence can photosynthesis become possible ?
Sunlight and chloroplast
Water and oxygen
Water and nitrogen
Sunlight and air
Which type of process is respiration ?
Endothermic
Exothermic
Endothermic and Exothermic both
None of these
When a single reactant breaks down to give simple product - which type of reaction is this ?
Displacement reaction
Decomposition reaction
Redox reaction
Double displacement reaction
The reason of conversion white silver chloride (AgCl) into blue colour in the presence of sunlight is ..........
Displacement of AgCl into Ag and Cl
Redox Reaction between AgCl and sunlight
Oxidation of AgCl in presence of sunlight
Decomposition of AgCl into Ag and Cl
Reaction of zinc with sulphuric acid gives zinc sulphate and Hydrogen. Which is the balanced
equation for this chemical change ?
Zn + H₂SO₄→ZnSO₄ + H₂
Zn + 2H₂SO₄→2ZnSO₄ + H₂
2Zn + H₂SO₄→ZnSO₄ + 2H₂
It is not given here
Reaction in which heat is released with formation products-which type of reaction is this ?
Exothermic
Precipitation
Endothermic
Decomposition
What is the chemical formula of marble ?
Na₂CO₃
CaCO₃
BaCO₃
Ca(OH)₂
Oxygen gas is added to prevent oxidation of chips.
True
False
When metal is attacked with moisture or acid,
it is called corrosion.
True
False
Making of fertilizer from vegetable matter, it is
an example of exothermic reaction.
True
False
The formula of sodium sulphite is Na₂SO₄.
True
False
