Worksheetschemical reactions and equations
Total questions: 15
Worksheet time: 12mins
The digestion of food in the body is an example of
(a) reaction.
The displacement reaction between iron (III) oxide and a metal X is used for welding the rail tracks. Here X is:
Copper granules
Magnesium ribbon
Sodium pellets
Aluminium dust
One of the following processes does not involve a chemical reaction. That is:
Melting of candle wax when heated
Burning of candle wax when heated
Digestion of food in our stomach
Ripening of banana
The oxidizing agent in the following reaction is (a)
CuO + H2 -->Cu + H2O
a copper penny turning greenish after a few years.
Physical change
Chemical change
Balance the following chemical equation:
___NaBr + ___Cl2 ----> ____NaCl + ___Br2
Enter the values serially
(a)
What is the molecular formula for barium chloride?
BaCl2
BaCl
Ba2Cl
BaCl3
Both CO2 and H2 gases are
heavier than air
colourless
acidic in nature
soluble in water
Chemically rust is
hydrated ferrous oxide
only ferric oxide
hydrated ferric oxide
none of these
A redox reaction is one in which-
both the substance are reduced
both the substance are oxidised
an acid is neutralised by the base
one substance is oxidised while the other is reduced
On passing CO₂ gas through the product formed by the reaction between CaO and H₂O, solution becomes which colour?
black
red
pink
white
In which of the following process a chemical reaction has taken place?
Ice melts into water
A wet shirt got dried in sunlight
A brown layer is formed over iron rod kept in air
sugar getting dissolved in water
Choose the correct balanced equation of barium chloride and aluminium sulphate.
3BaCl2+Al2(SO4)3→3BaSO4+2AlCl3
2BaCl2+Al2(SO4)3→2BaSO4+2AlCl3
6BaCl2+2Al2(SO4)3→6BaSO4+4AlCl3
none of the above
What are the substances on the left side called and right side of the chemical equation called respectively ?
products and reactants
groups and electrons
nothing
reactants and products
when does a chemical reaction take place ?
when a physical change occurs
when a chemical change occurs
both a and b
none of the above
