REDOX REACTIONS Quiz-6

Chemistry Aptitude Quiz

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IIT JEE exam which consists of JEE Main and JEE Advanced is one of the most important entrance exams for engineering aspirants. The exam is held for candidates who are aspiring to pursue a career in the field of engineering and technical studies. Chemistry is important because everything you do is chemistry! Even your body is made of chemicals. Chemical reactions occur when you breathe, eat, or just sit there reading. All matter is made of chemicals, so the importance of chemistry is that it's the study of everything..

Q1. In alkaline medium, ClO_2 oxidisesH_2 O_2 toO_2 and is itself reduced to Cl^⊖. How many moles of H_2 O_2 are oxidized by 1 mol of ClO_2?

•  1
•  3/2
•  5/2
•  7/2

Solution
(c) 5e^-+ClO_2⟶Cl^⊖ Eq of ClO_2=Eq ofH_2 O_2 (n=5 )(n=2) 1/5 mol≡1/2 mol 1 mole of ClO_2=5/2 mol of H_2 O_2

Q2.An organic Compound (A) (C_4 H_6)forms a precipitate with Tollens and Fehling’s regents. (A) has an isomer (B). (B) reacts with 1 mol of Br_(2 )to form 1, 4 dibromo-2-butene. (A) and (B) are:

•  
•  
•  
•  

Solution

Q3.  For the reaction M^(x+)+MnO_4^( ⊖)⟶MO_3^( ⊖)+Mn^(2+)+(1/2) O_2 If 1 mol of MnO_4^( ⊖) oxidises 1.67 mol ofM^(x+) to MO_3^( ⊖), then the value of x in the reaction is

•  5
•  3
•  2
•  1

Solution
(c) x-6=-1 x=5 Equivalent of MnO_4^( ⊖)=Equivalent of M^(x+) 1 mol ×5=1.67 mol×(5-x) ∴x=2

Q4.   An element that never has a positive oxidation state in any of its compounds is

•  Boron
•  Oxygen
•  Chlorine
•  Fluorine

Solution
(d) F has the highest electronegativity

Q5.Which of the following is the strongest oxidising agent?

•  I_2
•  F_2
•  Cl_2
•  Br_2

Solution
  <(b) Reduction potential of F_2>Cl_2>Br_2>I_2

Q6. 

•  Give iodoform test
•  Further react with 〖MeMgBr/H〗_3 O^⨁to give t-butyl alcohol
• Be obtained by the ozonolysis of 2,3-dimethy 1-2-butene
•  All correct

Solution

Q7.In the reaction 3Br_2+6CO_3^(2-)+3H_2 O ⟶5Br^⊖+BrO_3^⊖+6HCO_3^( ⊖)

•  Br_2 is oxidized and CO_3^(2-) is reduced
•  Br_2 is reduced and H_2 O is oxidised
•  Br_2 is neither reduced nor oxidised
•  Br_2 is both reduced and oxidised

Solution
(d) It is a disproportionation reaction in which Br_2 is both reduced and oxidized. The oxidation state of C in both CO_3^(2-) and HCO_3^( ⊖) does not change

Q8.In which of the following compounds, the oxidation state of transition metal is zero?

•  CrO_5
•  Fe_3 O_4
•  FeSO_4
•  Fe(CO)_5

Solution
(d) Oxidation sate of Fe=0

Q9.The oxidation number of Fe in Na_2 [Fe(CN)_5 NO] is

•  +2
•  +1
•  +3
•  -2

Solution
(a) Oxidation state of Fe=+2

Q10. Which of following is not a disproportionation reaction?

•  KO_2+H_2 O+CO_2⟶KHCO_3+O_2
•  KCIO_3⟶KCIO_4+KCI
•  PbO_2+H_2 O⟶PbO+H_2 O_2
• 

Solution
(c)
(c) is not a disproportionation reaction

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