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Daily Life Chemistry
Who introduce simple symbols to denote the valence shell electrons in an atom.

a) Gilbert Newton Lewis
b) Johannes van der waals
c) John Dalton
d) Sir Issac Newton



Answer
Correct Answer Is : Gilbert Newton Lewis
Solution Is :
Write the empricial formula of Na,O

a) Na2O
b) NaO
c) Na2O2
d) Na3O



Answer
Correct Answer Is : Na2O
Solution Is :
In NO-3 ion, the number of bond pairs and lone pairs of electrons on nitrogen atom are

a) 1,0
b) 4,0
c) 2,3
d) 5,1



Answer
Correct Answer Is : 4,0
Solution Is :
Identify the type of reaction :- CH4 + 2O2 → CO2 + 2H2O

a) Combustion reaction and oxidation reaction
b) Displacement reaction
c) Combination reaction
d)  Synthesis reaction



Answer
Correct Answer Is : Combustion reaction and oxidation reaction
Solution Is :
Identify the type of reaction :- CuSO4 + Zn → ZnSO4 + Cu

a) Displacement reaction
b) Decomposition reaction
c)  Single displacement reaction
d) Combination reaction



Answer
Correct Answer Is : Displacement reaction
Solution Is :
Identify the type of reaction :- CaO + H2O → Ca(OH)2

a) Combination reaction
b) Double displacement reaction
c) Acid-base reaction
d) Displacement reaction



Answer
Correct Answer Is : Combination reaction
Solution Is :
Identify the type of reaction :- Pb(NO3)2 + 2KI -→PbI2 + 2KNO3

a) Double displacement reaction
b) Combustion reaction and oxidation reaction
c) Acid-base reaction
d) Displacement reaction



Answer
Correct Answer Is : Double displacement reaction
Solution Is :
Fe2 O3 + 2Al2 O3 + 2Fe is an example of a

a) Double displacement reaction
b) Combustion reaction and oxidation reaction
c) Displacement reaction
d) Combination reaction



Answer
Correct Answer Is : Displacement reaction
Solution Is :
Write the balance chemical equation :- Calcium Hydroxide + carbon dioxide →Calcium carbonate +water

a) Ca(OH)2 (aq) + CO2(g)→ CaCO3 (s) + H2O(l)
b) Ca(OH)2 (aq) + CO2(g)→ CaC3 (s) + H2O(l)
c) Ca(OH)2 (g) + CO2(aq)→ CaCO3 (s) + H2O(l)
d) Ca(OH)2 (aq) + CO2(g)→ Ca2CO3 (s) + H2O(l)



Answer
Correct Answer Is : Ca(OH)2 (aq) + CO2(g)→ CaCO3 (s) + H2O(l)
Solution Is :
Which gas is evolved when sodium hydrogencarbonate reacts with dilute hydrochloric acid?

a) Carbon dioxide
b) Heluim
c) Methane
d) Carbon monoxide



Answer
Correct Answer Is : Carbon dioxide
Solution Is :
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