19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
Formation of ozone in the upper atmosphere from oxygen takes place by the action of
Which of the following is most abundant hydrocarbon pollutant
The gas responsible for ozone depletion
The aromatic compounds present as particulates are
Which is true about DDT
The type of pollution caused by spraying of DDT
Water is often treated with chlorine to
BOD is connected with
Eutrophication causes reduction in
Phosphate fertilizers when added to water leads to
Phosphate pollution is caused by
The false statement among the following is :
Which of the following causes lung cancer
The non-viable particulate among the following is
Ozone layer of stratosphere requires protection from indiscriminate use of
Which of the following acts as a sink for CO?
Which of the following chemical, harmful to ozone, is released by chlorofluoro carbon
Ozone is an important constituent of stratosphere because it
For the process: Cu²⁺ + 2e– → Cu; log[Cu²⁺] vs. Ered graph is shown in the figure, where OA = 0.34 V. The electrode potential of the half-cell of Cu|Cu²⁺ (0.1 M) will be [2.303 RT/F = 0.06]
Two students use same stock solution of ZnSO₄ but different solutions of CuSO₄. The EMF of one cell is 0.03 V higher than the other. The concentration of CuSO₄ in the cell with higher EMF value is 0.5 M. The concentra…
When metallic copper is shaken with a solution of a copper salt, the reaction proceeds. When equilibrium is established at 298 K, [Cu²⁺]/[Cu⁺]2 = 1.667 × 106 M–1. If the standard potential of the Cu²⁺ | Cu half-cell i…
The reduction potential at 25 °C for Fe³⁺|Fe²⁺ electrode is +0.718 V. If , the ratio of molar concentrations of Fe²⁺ to Fe³⁺ ions in solution is (2.303RT/F = 0.06, log 5 = 0.7)
Which graph correctly correlates Ecell as a function of concentrations for the cell Zn(s) + 2Ag⁺(aq) Zn²⁺(aq) + 2Ag(s), E°cell = 1.56 V Y-axis : Ecell, X-axis : log10 (a) (b) (c) (d)
The e.m.f. of a Daniell cell at 298K is When the concentration of ZnSO₄ is 1.0 M and that of CuSO₄ is 0.01 M, the e.m.f. changed to E2. What is the relationship between E1 and E2?
On the basis of information available from the reaction 4Al + 3O₂ →2Al₂O₃; ∆G = – 965 kJ/mol of O₂.The minimum EMF required to carry out electrolysis of Al₂O₃ is