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NEET Exam  >  NEET Tests  >  Test: Oxidation Number (August 29) - NEET MCQ

Test: Oxidation Number (August 29) - NEET MCQ


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10 Questions MCQ Test - Test: Oxidation Number (August 29)

Test: Oxidation Number (August 29) for NEET 2024 is part of NEET preparation. The Test: Oxidation Number (August 29) questions and answers have been prepared according to the NEET exam syllabus.The Test: Oxidation Number (August 29) MCQs are made for NEET 2024 Exam. Find important definitions, questions, notes, meanings, examples, exercises, MCQs and online tests for Test: Oxidation Number (August 29) below.
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Test: Oxidation Number (August 29) - Question 1
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Direction (Q. Nos. 1-12) This section contains 12 multiple-choice questions. Each question has four
choices (a), (b), (c) and (d), out of which ONLY ONE option is correct.

Consider the following reactions.
I. Zn + dil. H2So4 → ZnSO4 + H2
II. Zn + conc. H2SO4 → ZnSO4 + SO4 + H2O
III. Zn + HNO3 → Zn(NO3)2 + H2O + NH4NO3

Q.  Oxidation number of H changes in: 

Detailed Solution for Test: Oxidation Number (August 29) - Question 1



Test: Oxidation Number (August 29) - Question 2
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In which of the following set of compounds oxidation number of oxygen is not (- 2)?

Detailed Solution for Test: Oxidation Number (August 29) - Question 2


OF2 Fluorine is most electronegative atom with oxidation number = - 1
x - 2 = 0
x = + 2
H2O2   2 + 2x = 0 ⇒ x = - 1 

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Test: Oxidation Number (August 29) - Question 3
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Which of the following is not an example of redox reaction?

Detailed Solution for Test: Oxidation Number (August 29) - Question 3

a) BaCl2 + H2SO4 → BaSO4 + 2HCl is not a redox reaction, as there is no change in the oxidation state of any element.
It is an example of double displacement reactions.

Test: Oxidation Number (August 29) - Question 4
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The oxidation number of P in Ba(H2PO2)2, Ba(H2PO3)2 and Ba(H2PO4)2 are respectively
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Test: Oxidation Number (August 29) - Question 5
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In which of the following reactions oxidation number of chromium has been affected?
Detailed Solution for Test: Oxidation Number (August 29) - Question 5


Oxidation number of Cr changes from +6 to +3.

Test: Oxidation Number (August 29) - Question 6
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In the following reaction, , oxidation number of
*Multiple options can be correct
Test: Oxidation Number (August 29) - Question 7
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Direction (Q. Nos. 13 and  14) This section contains 2 multiple choice questions. Each question has four choices (a), (b), (c) and (d), out of which ONE or  MORE THANT ONE  is correct.

Q. Which of the following species has/have oxidation number of the metal as + 6 ?
Detailed Solution for Test: Oxidation Number (August 29) - Question 7




Test: Oxidation Number (August 29) - Question 8
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Oxidation numbers of P in PO4−3, of S in SO42− and that of Cr in Cr2O72− are respectively,
Detailed Solution for Test: Oxidation Number (August 29) - Question 8

The correct answer is option A
(I) xPO43−​ ⇒ x + 4 × (−2) = −3
                ⇒x = −3 + 8 = +5
                ⇒x = +5
Oxidation number of P = +5
(II) xSO42−​ ⇒ x + 4 × (−2) = −2
                ⇒x = −2 + 8
                  ⇒x = +6
Oxidation number of S=+6
(III) xCr2​O72− ​    ⇒2x + 7 × (−2) = −2
                        ⇒2x =−2+14
                        ⇒2x=12
                        ⇒x= 12/2​ = +6

*Multiple options can be correct
Test: Oxidation Number (August 29) - Question 9
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The complex [Fe(H2O)5NO]2+ is formed in the ring-test for nitrate ion when freshly prepared FeSO4 solution is added to aqueous solution of followed by the addition of conc. H2SO4. NO exists as NO+ (nitrosyl).

Q. Magnetic moment  of Fe in the ring is 

Detailed Solution for Test: Oxidation Number (August 29) - Question 9

Fe2+ is added asFeSO4
Fe+ is formed by charge transfer from NO to Fe2+ 



Fe+ has three unpaired electrons (N).

*Answer can only contain numeric values
Test: Oxidation Number (August 29) - Question 10
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Direction (Q. Nos. 18 and 19) This section contains 2 questions. when worked out will result in an integer from 0 to 9 (both inclusive)

Q.   S2O32- has two types of sulphur atoms. What is the difference in the oxidation states of two types of sulphur atoms?

Detailed Solution for Test: Oxidation Number (August 29) - Question 10

 The two sulfur atoms of thiosulfate exist in the oxidation state of sulfate (+6) and sulfide (−2) and do not change their respective oxidation states upon disproportionation.  

So difference in the oxidation states of two types of sulphur atoms will be

= (+6)- (-2) 

= +8

                                              

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