Question

What are the oxidation states of phosphorus in the following compounds?
$${H_3}P{O_2},{H_3}P{O_4},P{H_3},HP{O_3}$$

A. +1, +3, +3, +5
B. +3, +3, +5, +5
C. +1, +2, +3, +5
D. +1, +5, -3, +5  
Answer :   +1, +5, -3, +5
Solution :
$$\eqalign{ & {H_3}P{O_2}: + 3 + x - 4 = 0 \Rightarrow x = + 1 \cr & {H_3}P{O_4}: + 3 + x - 8 = 0 \Rightarrow x = + 5 \cr & P{H_3}:x + 3 = 0 \Rightarrow x = - 3 \cr & HP{O_3}: + 1 + x - 6 = 0 \Rightarrow x = + 5 \cr} $$

Releted MCQ Question on
Physical Chemistry >> Redox Reaction

Releted Question 1

Which of the following represents a redox reaction?

A. $$NaOH + HCl \to NaCl + {H_2}O$$
B. $$BaC{l_2} + {H_2}S{O_4} \to BaS{O_4} + 2HCl$$
C. $$CuS{O_4} + 2{H_2}O \to Cu{\left( {OH} \right)_2} + {H_2}S{O_4}$$
D. $$Zn + 2HCl \to ZnC{l_2} + {H_2}$$
View Answer
Releted Question 2

Which reaction involves neither oxidation nor reduction?

A. $$CrO_4^{2 - } \to C{r_2}O_7^{2 - }$$
B. $$Cr \to CrC{l_3}$$
C. $$Na \to N{a^ + }$$
D. $$2{S_2}O_3^{2 - } \to {S_4}O_6^{2 - }$$
View Answer
Releted Question 3

$$Zn$$  gives $${H_2}$$  gas with $${H_2}S{O_4}$$  and $$HCl$$  but not with $$HN{O_3}$$  because

A. Zn acts as an oxidising agent when it reacts with $$HN{O_3}$$
B. $$HN{O_3}$$  is weaker acid than $${H_2}S{O_4}$$  and $$HCl$$
C. In electrochemical series, $$Zn$$  is above hydrogen
D. $$NO_3^ - $$  is reduced in preference to hydronium $$ion$$
View Answer
Releted Question 4

A compound of $$Xe$$  and $$F$$  is found to have $$53.5\% $$  of $$Xe.$$  What is oxidation number of $$Xe$$  in this compound ?

A. $$-4$$
B. $$0$$
C. $$+4$$
D. $$+6$$
View Answer

Practice More Releted MCQ Question on
Redox Reaction

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Physical ChemistrySome Basic Concepts in ChemistryStoichiometryStates of Matter Solid, Liquid and GasAtomic StructureChemical ThermodynamicsSolutionsSolid StateSurface ChemistryChemical EquilibriumIonic EquilibriumChemical KineticsRedox ReactionElectrochemistryNuclear Chemistry
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