Previous year questions with solutions · 2000 – 2026
| Year | Questions | Papers | Avg / paper | Weightage |
|---|---|---|---|---|
| 2026 | 2 | 2 | 1 | 2.22% same as last year |
| 2025 | 1 | 1 | 1 | 2.22% ▲ 124.4% vs last year |
| 2024 | 1 | 2 | 0.5 | 0.99% ▼ 49.5% vs last year |
| 2023 | 1 | 1 | 1 | 1.96% ▲ 98% vs last year |
| 2022 | 1 | 2 | 0.5 | 0.99% ▼ 50.5% vs last year |
| 2021 | 1 | 1 | 1 | 2.00% ▼ 10% vs last year |
| 2020 | 1 | 1 | 1 | 2.22% same as last year |
| 2019 | 1 | 1 | 1 | 2.22% ▼ 66.7% vs last year |
| 2018 | 3 | 1 | 3 | 6.67% ▲ 200% vs last year |
| 2015 | 2 | 2 | 1 | 2.22% ▼ 50% vs last year |
| 2014 | 2 | 1 | 2 | 4.44% ▲ 18.5% vs last year |
| 2012 | 3 | 2 | 1.5 | 3.75% ▲ 91.3% vs last year |
| 2009 | 1 | 1 | 1 | 1.96% same as last year |
| 2008 | 1 | 1 | 1 | 1.96% ▼ 5.9% vs last year |
| 2004 | 1 | 1 | 1 | 2.08% ▲ 2.1% vs last year |
| 2003 | 1 | 1 | 1 | 2.04% ▲ 2% vs last year |
| 2002 | 1 | 1 | 1 | 2.00% ▲ 2% vs last year |
| 2000 | 1 | 1 | 1 | 1.96% |
In an acidic medium, 10 mL of 0.25 M oxalic acid is titrated with KMnO4 solution. If the volume of KMnO4 solution required to reach end point is 10 mL, the strength of the KMnO4 solution is
The correct decreasing order of oxidation state of the underlined atom in each molecule is
Consider the following compounds : KO2, H2 O2 and H2 SO4 The oxidation state of the underlined elements in them are, respectively,
Which reaction is NOT a redox reaction?
On balancing the given redox reaction, a Cr2O72-(aq) + b SO32-(aq) + cH+(aq) 2a Cr3+(aq) + b SO42-(aq) + c2H2O( ) the coefficients a, b and c are found to be, respectively -
Which of the following reactions is a decomposition redox reaction?
Which of the following reactions is the metal displacement reaction? Choose the right option.
What is the change in oxidation number of carbon in the following reaction? CH4(g) + 4Cl2(g) CCl4(l) + 4HCl(g)
Which of the following reactions are disproportionation reaction? Select the correct option from the following :
Consider the change in oxidation state of bromine corresponding to different emf values as shown in the given diagram : BrO4- 1.82 V BrO3- 1.5 V HBrO 1.595 V Br2 1.0652 V Br- Then the species undergoing disproportionation is :
The correct order of N-compounds in its decreasing order of oxidation states is
For the redox reaction, MnO4- + C2O42- + H+ Mn2+ + CO2 + H2O The correct coefficients of the reactants for the balanced equation are
Assuming complete ionisation, same moles of which of the following compounds will require the least amount of acidified KMnO4 for complete oxidation?
Which of the following processes does not involve oxidation of iron?
The pair of compounds that can exist together is
In acidic medium, H2O2 changes Cr2O72- to CrO5 which has two (-O-O-) bonds. Oxidation state of Cr in CrO5 is
When Cl2 gas reacts with hot and concentrated sodium hydroxide solution, the oxidation number of chlorine changes from
A mixture of potassium chlorate, oxalic acid and sulphuric acid is heated. During the reaction which element undergoes maximum change in the oxidation number?
In which of the following compounds, nitrogen exhibits highest oxidation state?
Oxidation numbers of P in PO43-, of S in SO42- and that of Cr in Cr2O72- are respectively
Number of moles of MnO4- required to oxidize one mole of ferrous oxalate completely in acidic medium will be
Which is the best description of the behaviour of bromine in the reaction given below? H2O + Br2 HOBr + HBr
The oxidation states of sulphur in the anions SO32-, S2O42- and S2O62- follow the order
Which reaction is not feasible?
Oxidation numbers of A, B, C are +2, +5 and -2 respectively. Possible formula of compound is