Last seen: May 1, 2022
Inner transition metals are those elements in which the last electron enters the f-orbital. The elements in which the 4f and the 5f orbitals are progr...
An alloy is a solid solution of two or more elements in a metallic matrix. It can either be a partial solid solution or a complete solid solution. All...
(i) Potassium dichromate (K2Cr2O7) is prepared from chromite ore (FeCr2O4) in the following steps. Step (1): Preparation of sodium chromate FeCr2O...
(i) In the case of a lower oxide of a transition metal, the metal atom has a low oxidation state. This means that some of the valence electrons of the...
(i) Mn3+, [Ar]3d4 → 4 (ii) Cr3+, [Ar]3d3 → 3 (iii) V3+, [Ar]3d2 → 2 (iv) Ti3+, [Ar]3d1 → 1 Cr3+ is the most stable in aqueous solutions owing ...
In the first transition series, Cu exhibits +1 oxidation state very frequently. It is because Cu (+1) has an electronic configuration of [Ar] 3d10. Th...
It is found that sometimes a relatively less stable oxidation state undergoes an oxidation - reduction reaction in which it is simultaneously oxidised...
(i) Cr2+ is strongly reducing in nature. It has a d4 configuration. While acting as a reducing agent, it gets oxidized to Cr3+ (electronic configurati...
(i) Electronic configuration: The general electronic configuration for lanthanoids is [Xe]54 4f0-14 5d0-16s2 and that for actinoids is [Rn]86 5f1-146d...
Correct answer: (b) Concentration of DO below 6 ppm is good for the growth of fish. Explanation: The ideal value of DO for growth of fishes is 8 m...
Correct answer: (d) (i), (ii) and (iii) Explanation: 3CH4 + 2O3 → 3CH2 = O + 3H2O CH2 = CHCH = O; CH3COONO2
Correct answer: (d) All of these Explanation: All the given statements are true for about waste recycling.
Correct answer: (d) Using plastic cans for storing substances
Correct answer: (d) None of these
Correct answer: (d) (iii) and (iv) Explanation: For statement (iii), Methemoglobinemia (blue baby syndrome) is caused due to excess of nitrate in ...
Correct answer: (a) suspended particulate matter (SPM)
Correct answer: (c) Solar energy → Green house effect Explanation: Solar energy is not responsible for green house effect instead it is a source o...
Correct answer: (a) (i) and (iii) Explanation: Classical smog is also called reducing smog.
Correct answer: (c) because of SO2 pollution Explanation: Because lichens are very sensitive to sulphur dioxide and in cities the amount of SO2 is...
Correct answer: (a) Oil slick in sea water increases D.O. value Explanation: Oil slick in sea water decreases D.O value.