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Q45 Number ONLY. 1 Point Balance the following chemical reaction: Co203 (s) + C(s) + Co (s) + CO2 (g) Enter the COEFFICIENTS
Q47 Multi-Part 2 Points Consider the reaction below: 3NaOH (aq) + Fe(NO3)2 (aq) 3NaNO, (aq) + Fe(OH); (s) Choose the TWO spec
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Answer #1

Q. 45 --------------

2343

Q. 46 ------------

Pb(NO3)2 + Na2SO4 ------> Pb SO4 + 2 NaNO3

Here only PbSO4 is insoluble in aqueous medium and it appears as white crystal or PPT.

Option (III) Pb SO4 is correct.

Q. 47 --------

Spectator ions are those which do not take part in reaction, no changes are seen in the oxidation states and physical states, to determine the spectator ion first we put the net ionic equation with physical states.

[3Na+ aq + 3 OH - aq] + [Fe+3 aq + 3 NO3- aq] -----> 3 Na+ aq + 3 NO3- aq + Fe+3 (S) + 3 OH-(S)

Here Na+ and NO3- ions they remain aqueous throughout the reaction hence Na+ and NO3- are spectator ions.

Option (I) and option (IV) are spectator ions

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