REDOX REACTIONS Quiz-7

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. The oxidation number P inBa(H_2 PO_2 )_2is

•  +3
•  +2
•  +1
•  -1

Solution
(a) Ba^(2+) (H_2 PO_2 )_2^(-1×2) ∴H_2 PO_2^( ⊖)=2+x-4=-1 ∴x=+1 Oxidation state of P=+1

Q2.In which of the following processes is nitrogen oxidised?

•  NH_4^( ⊕)⟶N_2
•  NO_3^( ⊖)⟶ NO
•  NO_2 ⟶NO_2^( ⊖)
•  NO_3^( ⊖)⟶NH_4^( ⊕)

Solution
(a) NH_4^( ⊕)⟶N_2 Oxidation state of N=-3 Oxidation state of N=0 In the other reaction, the oxidation state of N decreases

Q3.  Which of the following is an intermolecular redox reaction?

•  2 OCH-CHO□( ) HOCH_2-CH_2 OH
•  2C_6 H_5 CHO□(→┴( Al(OC_2 H_5 )_3 ) C_6 H_5 COOH+C_6 H_5 CH_2 OH)
•  4CrO_5+6H_2 SO_4⟶2Cr_2 (SO_4 )_3+6H_2 O+7O_2
•  As_2 S_3+HNO_3⟶H_3 AsO_4+H_2 SO_4+NO

Solution
(d) Intermolecular redox reaction involves oxidation of one molecule and reduction of the other molecule like in redox reactions

Q4.  

•  I, II I, II
•  I , III I , II
•  IV, V I,III
•  VI, III I, III

Solution
(b) Lemieux reagent (KMnO_4+ NaIO_4) converts RCH= to RCOOH and R_2 C = to R_2 C=O, while with (OsO_4+NaIO_4) converts to RCHO and R_2 C= to R_2 C=O group. So the answer is (b)

Q5.The compound that will not give iodoform on treatment with alkali and iodine is:

•  Acetone
•  Ethanol
•  Diethyl ketone
•  Isopropyl alcohol

Solution
 

Q6. A mole of N_2 H_4 loses 10 mol of electrons to form a new compound Y. Assuming that all the nitrogen appears in the new compound, what is the oxidation state of nitrogen in Y? (There is no change in the oxidation number of hydrogen)

•  -1
•  -3
• +3
•  +5

Solution

Q7.

•  
•  
•  
•  

Solution

Q8.Which of the following is the best description of the behavior of bromine in the reaction given below? H_2 O+Br_2⟶HOBr+HBr

•  Proton acceptor only
•  Both oxidized and reduced O_4
•  Oxidised only
•  Reduced only

Solution
(b) It is a disproportionation reaction

Q9.The oxidation state of A, B and C in a compound are +2, +5, and -2 respectively. The compound is

•  A_2 (BC)_2
•  A_2 (BC)_3
•  A_3 (BC_4 )_2
•  A_2 (BC_4 )_3

Solution

Q10. Hydrogenation of benzoyl chloride in the presence of Pd on BaSO_4gives:

•  Benzyl alcohol
•  Benzaldehyde
•  Benzoic acid
• Phenol/>

Solution
Part B

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