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Redox And Equivalent Concept Quiz-9

Dear Readers,

The one subject in NEET which is candidates who can easily attain good marks is Chemistry. That's the reason, often, one doesn’t pay notice and choose to compromise it. But if one wants to rank above others, the tip is to be thorough with NEET chemistry concepts. The understanding of reactions and definite basic understanding is what requires major attention in Chemistry but once done it only gets simpler from there. The main focus on the to-do list should be on getting a hang of the NCERT syllabus of NEET chemistry..



Q1. The oxidation number of N in NH3 is :
  •  -3
  •  +3
  •  Zero
  •  5
Solution
(a) a+3 × (+1)=0 ∴a= -3  

Q2.A 0.50 M solution of KI reacts with excess of H2 SO4 and KIO3 solutions according to the equation, 6H+ +5I- +IO3- ⟶3I2+3H2 O. Which of the following statements is true?
  •  200 mL of the KI solution reacts with 0.10 mole KIO3.
  •  100 mL of the KI solution reacts with 0.060 M of H2 SO4.
  •  0.5 litre of the KI solution produces 0.15 mole of I2
  •  None of the above
Solution
(c) 5 mole I- gives 3 mole I2

Q3. In the conversion of Br2 to BrO3-, the oxidation number of Br changes from  
  •  Zero to +5
  •  +1 to +5
  •  Zero to -3
  •  +2 to +5
Solution
(a) Bromine has zero oxidation state because it is in free state. 0 Br2⟶BrO3- Let the oxidation number of Br in BrO3- is x. x+(-2×3)=-1 x+(-6)= -1 x=+6-1 x=+5 So, oxidation number changes from 0 to +5.

Q4. LiAIH4 is used as :
  •  Oxidising agent
  •  Reducing agent
  •  A mordant
  •  Water softner
Solution
(b) H in LiAIH4 has −1 ox.no. and thus, easily oxidized.

Q5.Solution of sodium metal in liquid NH3 is strongly reducing due to the presence of :
  •  Sodium atoms
  •  Solvated electrons
  •  NaOH
  •  Sodium amide
Solution
 


Q6. The oxidation number of phosphorus in PO43-,P4 O10 and P2 O74- is :
  •  +3
  •  +2
  •  -3
  •  +5
Solution
(d) Find oxidation number of P in each.  

Q7.In the reaction, VO+Fe2 O3 ⟶FeO+V2 O5. The eq.wt. of V2 O5 is equal to its :
  •  mol. wt.
  •  mol. wt./8
  •  mol. wt./6
  •  None of these
Solution
(c) 2V2+ ⟶V25++6e

Q8.Ozone tails mercury. The reaction is ….of Hg.
  •  Reduction
  •  Oxidation
  •  Substitution
  •  None of these
Solution
(b) Hg+O3 ⟶HgO+O2  

Q9.A student states that heating of limestone is an oxidation process, the reason he gives that an oxide of the metal is produced on heating. Which one is correct?
  •  The statement and reason are true
  •  The statement and reason are wrong
  •  The statement is true but the reason is false
  •  None of the above
Solution



Q10. The reaction; H2 S+H2 O2 ⟶2H2 O+S shows :
  •  Acidic nature of H2 O2
  •  Alkaline nature of H2 O2
  •  Oxidising action of H2 O2
  •  Reducing action of H2 O2
Solution
(c) H2 O2 oxidises S2- to S0.


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