CHEMICAL REACTIONS AND EQUATIONS
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- Q1
The reaction of iron nail with copper sulphate solution is………reaction.
decomposition
double displacement
combination
displacement
30s - Q2
Reddish brown deposit formed on iron nails kept in a solution of copper sulphate is
Cu2O
CuO
Cu
CuS
30s - Q3
The reaction CuSO4(aq) + Zn(s) →ZnSO4(aq) + Cu(s) isa……..reaction.
double displacement
decomposition
displacement
combination
30s - Q4
. ………is a combination reaction.
2HgO⟶Δ2Hg+O2
CaCO3⟶ΔCaO+CO2
H2 + Cl2 → 2HCl
Cu+ H2SO4 → CuSO4 + H2
30s - Q5
………..a decomposition reaction
CaCO3⟶ΔCaO+CO2
2H2 + O2 → 2H2O
H2O + CO2 → H2CO3
CaS+ 2HCl → CaCl2 + H2S
30s - Q6
Ina chemical equation the………are written on the left hand side.
element
catalysts
reactant
product
30s - Q7
TheΔ sign written above the arrow indicates………..of the reaction.
direction of the reaction
product
reactant
heat
30s - Q8
The reaction KNO3(S) + H2O(l) + Heat → KNO3(aq) is a/an………reaction.
reduction
oxidation
endothermic
exothermic
30s - Q9
The reaction NaOH(S) + H2O(l) → NaOH(aq) isa/an……..reaction.
oxidation
exothermic
endothermic
reduction
30s - Q10
A solution of Al2(SO4)3 in water is……….
green
red
colourless
pink
30s - Q11
Carbon dioxide………..
All the three (a), (b) and (c) are correct
odourless
turn slime water milky
colourless
30s - Q12
When……..is passed through fresh lime water, it turns milky.
CO
SO2
H2
CO2
30s - Q13
Magnesium reacts with con. HCl to form………..salt.
calcium chloride
ferrous chloride
copper chloride
magnesium chloride
30s - Q14
Zinc reacts with hydrochloric acid. The reaction is a reaction.
dispacement
decomposition
combination
double displacement
30s - Q15
Ina double displacement reaction,…………
ions are exchanged
ionsare not created
ions get liberated
ions remain at rest
30s