REDOX REACTIONS Quiz-13

REDOX REACTION QUIZ-13

Dear Readers,

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. A compound that gives a positive iodoform test is:

•  1-Pentanol
•  3-Pentanone
•  2-Pentanone
•  Pentanal

Solution
(c). (it contains (ME-CO-) group and gives positive iodoform test)

Q2. In the equation NO2^(⊝)+H2O⟶NO3^(⊖)+2H^⊕+ne^- nstands for

•  1
•  2
•  3
•  4

Solution
(b). NO2^(⊖)+H2O⟶NO3^(⊖)+2H^⊕+2e^- Balance charge on both sides.

Q3.  Which of the following leads to redox reaction?

•  AgNO3+HCl
•  KOH+HCl
•  KI+Cl2
•  NH3+HCl

Solution
(c). Redox reactions are characterized by the transfer of electrons between chemical species, most often with one species undergoing oxidation while another species undergoes reduction.

Q4. Which of the following is not a reducing agent?

•  SO2
•  H2O2
•  CO2
•  NO2

Solution
(c). Oxidation state of C in CO_2is+4, which is maximum. So it does not undergo oxidation, and hence, it is not a reducing agent.

Q5.Among the following, identify the species with an atom in +6 oxidation state

•  MnO4^(⊖)
•  [Cr(CN)6]^(3-)
•  [NiF6]^(2-)
•  CrO2Cl2

Solution
 (d). CrO2​Cl2 x−4−2=0 x=6 ∴ oxidation state of Cr in CrO2Cl2 is +6.

Q6. 

        

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Solution
option-(c)

Q7.Toluene on reaction with CrO_3andAc_2 O gives benzaledehyde as the main product.The intermediate compound formed in the reaction is:

•  PhCH2OH
•  PhCH(OAc)2
•  PhCH2OAc
•  PhCH(OH)2

Solution
option-(b)

Q8.Which of the following is disproportionation reaction?

•  Cu2O+2H^⊕⟶Cu+Cu^(2+)+H2O
•  2CrO4^(2-)+2H^⊕⟶Cr2O7^(2-)+H2O
•  CaCO3+2H^⊕⟶Ca^(2+)+H2O+CO2
•  PCl5---> PCl3+Cl2

Solution
(a). Statement is self-explanatory.

Q9.Which of the following is not a disporportionation reaction?

•  2PhCHO--->PhCOOCH2Ph
•  Cu2O+2H^⊕⟶Cu+Cu^(2+)+H2O
•  NaH+H2O⟶NaOH+H2
•  All

Solution
(c). c is an oxidation reaction 2H^⊖⟶H_2+2e^-

Q10.  In Rosenmund reduction, which of the following does not poison the catalyst Pd?

•  BaSO4
•  S
• Quinoline
• Xylene

Solution
(d). All the reagents convert group to(-CH_2-) group. So the answer is (d).