Practice Test

Q1) Which of the following represents a redox reaction ? Show Answer

Q2) Oxidation is a process which involves Show Answer

Q3) Which of the following acts as a reducing agent ? Show Answer

Q4) Which of the following acts both as an oxidising agent as well as a reducing agent ? Show Answer

Q5) Which of the following acts as an oxidising agent ? Show Answer

Q6) The violent reaction between sodium and water is an example of Show Answer

Q7) Phosphorus has the oxidation state of +3 in Show Answer

Q8) In which of the following reactions, there is no change in valency ? Show Answer

Q9) Which of the following is an incorrect statement ? Show Answer

Q10) Which of the following elements has least oxidation number ? Show Answer

Q11) Among the following, identify the species with an atom in +6 oxidation state : Show Answer

Q12) Which of the following molecules can act as an oxidising as well as a reducing agent ? Show Answer

Q13) The number of electrons involved in the reduction of nitrate ion to hydrazine is Show Answer

Q14) The oxidation number of sodium in sodium amalgam is Show Answer

Q15) Which of the following is a redox reaction ? Show Answer

Q16) Reduction is a process which involves Show Answer

Q17) A reducing agent is a substance which can Show Answer

Q18) The reaction which takes place at the anode is Show Answer

Q19) The strongest reducing agent is Show Answer

Q20) Which one of the following is not a reducing agent ? Show Answer

Q21) Which of the following act as an oxidising agent ? Show Answer

Q22) Which of the following is best reducing agent ? Show Answer

Q23) Which is strongest reducing agent ? Show Answer

Q24) Among the following chemical compounds, which one of the following has the highest reducing power ? Show Answer

Q25) Which of the statements is/are true ?
(I) The process of oxidation leads to gain of electrons.
(II) The process of oxidation leads to loss of electrons.
(III) The process of reduction leads to gain to electrons.
(IV) The process of reduction leads to loss of electrons.
Select the correct answer from the codes given below : Show Answer

Q26) The process in which oxidation number of element increases is Show Answer

Q27) Oxidation number of oxygen is ozone Show Answer

Q28) Oxygen has an oxidation state +2 in Show Answer

Q29) Oxidation state of oxygen atom in potassium superoxide is Show Answer

Q30) In haemoglobin the iron is in oxidation state of Show Answer

Q31) Oxidation number of sulphur in perdisulphuric acid is Show Answer

Q32) Oxidation number of oxygen in hydrogen peroxide is Show Answer

Q33) In the reaction of potassium permanganate in acidic medium (mol. wt. = 158.04) with ferrous ammonium sulphate (mol. wt. = 392.14), the change in the oxidation state of manganese in potassium permanganate is Show Answer

Q34) The correct statement is Show Answer

Q35) A compound contains atom, X,Y, Z. The oxidation number of X is +2, Y is +5 and Z is -2, therefore, a possible formula of the compound is Show Answer

Q36) What is correct to say ? Show Answer

Q37) The standard electrode potential values of the element A, B and C are 0.68 V, -2.50 V and -0.50 V respectively. The order of their reducing power is Show Answer

Q38) ASSERTION (A) :
Fluorine exhibits the same oxidation state in all its components.
REASON (R) :
Fluorine atom has no d-orbital in the valence shell. Show Answer

Q39) ASSERTION (A) :
When hydrogen gas is passed over heated metallic oxide it removes the oxygen from it.
REASON (R) :
Hydrogen is an oxidising agent. Show Answer

Q40) The following question contains two statements, I and II. Examine these two statements and select the correct choice according to the codes given below :
(A) Both the statements are individually true and Statement II is the correct explanation of Statement I.
(B) Both the statements are individually true but Statement II is not the correct explanation of Statement I.
(C) Statement I is true, but Statement II is false.
(D) Statement I is false, but Statement II is true.
STATEMENT I :
Zinc is used for galvanisation to protect iron from rusting.
STATEMENT II :
Zinc is more reactive towards oxygen then iron. Show Answer

Q41) Which one among the following is an electrochemical cell that cannot be charged ? Show Answer

Q42) Which of the following statements regarding oxidation and reduction are correct ?
(I) In oxidation loss of electron takes place whereas in reduction, gain of electron takes place.
(II) In oxidation, gain of electron takes place whereas in reduction, loss of electron takes place.
(III) Oxidising agent decreases the oxidation number but reducing agent increases the oxidation number.
(IV) Oxidising agent increases the oxidation number but reducing agent reduces the oxidation number.
Select the correct answer using the codes given below : Show Answer

Q43) The following question contains two statements, I and II. Examine these two statements and select the correct choice according to the codes given below :
(A) Both the statements are individually true and Statement II is the correct explanation of Statement I.
(B) Both the statements are individually true but Statement II is not the correct explanation of Statement I.
(C) Statement I is true, but Statement II is false.
(D) Statement I is false, but Statement II is true.
STATEMENT I :
After cutting an apple or a banana, the colour of the cut surface becomes brown.
STATEMENT II :
Polyphenolic compounds present in fruits get oxidised in air and show colour. Show Answer

Q44) In oxidation
(I) Hydrogen is displaced from a substance.
(II) An electropositive element is added to or proportion of electropositive element increase in a substance.
Select the correct answer using the code given below : Show Answer

Q45) When a copper rod is dipped in aqueous silver nitrate solution, the colour of the solution changes to blue. This is because Show Answer

Q46) Silver ware turns black after a period of time due to formation of Show Answer

Q47) Iron nails are dipped into blue copper sulphate solution. After some time iron nails are Show Answer

Q48) An oxidising agent is a substance which Show Answer

Q49) Which one among the following metals is more reactive than hydrogen ? Show Answer

Q50) Which one among the following is the correct order of reactivity of the elements ? Show Answer

Q51) Aluminium is more reactive than iron but aluminium is less easily corroded than iron, because Show Answer