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WorksheetsChemical Reaction-1
Total questions: 15
Worksheet time: 8mins
The ______________ are in left hand side of a reaction.
reactant
product
initiator
all of them
Burning of methane is a ____________ reaction.
i. combination
ii. decomposition
iii. endothermic
iv. exothermic
i and ii
ii and iii
i and iv
ii and iii
Burning of magnesium ribbon gives __________________.
ashes
metal pieces
soot
white precipitate
We can identify the change as chemical change if there is _________.
change shape and colour
evolution of gases
rise in temperature
all of them
The -----> in a reaction gives us an idea of _____________.
which is product
which is reactant
direction of reaction
the end product
CO + H2 -----> _____________________.
Complete the reaction in balanced form by choosing the correct option.
CO2 + H2O
CH3OH
COOH
H2CO3
The reaction for photosynthesis is _________.
6CO2 + 6H2O --------> C6H12O6
6CO2 + 6H20 ----------> C6H12O6 + 6O2
6CO2 (aq) + 6H20 (l) ----------> C6H1206 (aq) + 6O2 (aq)
both iii and iv
Magnesium ribbon is cleaned before burning because ____________.
it needs to be shiny
we need to get the desired product
it is always covered with a layer of magnesium oxide
we need to remove the impurities which can slow down or stop the process of burning
When two or more reactant combine to form one or more product respectively, its called ________________ reaction.
displacement
decomposition
combination
double displacement
___________ reaction is opposite of combination reaction.
exothermic
endothermic
precipitating
decomposition
Quick lime turns into slaked lime when it is _____________.
burnt
dissolved
crushed
corroded
Calcium hydroxide reacts with carbon dioxide to form ________________ which is seen on the walls during white wash.
calcium carbonate
calcium oxide
calcium hydrogen carbonate
calcium hydroxide
Burning of fuels is also known as __________ type of reaction.
combination
exothermic
both of them
none of them
____________ is an exothermic reaction.
digestion
photosynthesis
saturation
respiration
____________ is exothermic reaction.
decomposition of vegetables
burning of fossil fuel
respiration of living things
all of these
