19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The ozone layer is present in
Ozone is an important constituent of stratosphere because it
Which of the following is not involved in the formation of photochemical smog?
Formation of London smog takes place in
Which forms the part of hazy fumes of photochemical smog
The statement which is not true
Which of the following chemical, harmful to ozone, is released by chlorofluoro carbon
Which of the following acts as a sink for CO?
Ozone layer of stratosphere requires protection from indiscriminate use of
The non-viable particulate among the following is
The false statement among the following is :
The gas responsible for ozone depletion
Which of the following is most abundant hydrocarbon pollutant
Formation of ozone in the upper atmosphere from oxygen takes place by the action of
The greenhouse effect is caused by
The greatest affinity for haemoglobin is shown by which of the following
The substance having the largest concentration in acid rain?
The substance which is a primary pollutant?
Assertion: Zinc can be used while copper cannot be used in the recovery of Ag from the complex [Ag(CN)₂]– Reason: Zinc is powerful reducing agent than copper.
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)
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]
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
A 1.0 M with respect to each of the metal halide AX3, BX2 CX3 and DX2 is electrolysed using platinum electrodes. If The correct sequence in which the various metals are deposited at the cathode is