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The general electronic configuration of lanthanoids is:
The basic character of the transition metal monoxides follows the order: (Atomic nos. Ti = 22, V = 23, Cr = 24, Fe = 26)
Four successive members of the first series of the transition metals are listed below. For which one of them does the standard potential (E° M²⁺/M) value have a positive sign?
Which of the following exhibits only a +3 oxidation state?
Compound 'A' in acidic medium does not give a precipitate with $H_2S$ but in $NH_4OH$ medium gives a precipitate. Compound 'A' is:
Which of the following elements can combine with chlorine to form more than one binary compound?
An element among the following that exhibits the maximum oxidation state is:
Zn gives H₂ gas with H₂SO₄ and HCl but not with HNO₃ because:
The compound among the following that is used in cosmetic surgery is:
The number of carbon atoms per unit cell of diamond unit cell is:
Identify the correct statements from the following: (a) $CO_2(g)$ is used as a refrigerant for ice cream and frozen food. (b) The structure of $C_{60}$ contains twelve six-carbon rings and twenty-five five-carbon rings. (c) ZSM-5, a type of zeolite, is used to convert alcohols into gasoline. (d) CO is a colorless and odorless gas.
The correct statement among the following is :
In which of the following pairs, both the species are not isostructural?
Al2O3 can be converted to anhydrous AlCl3 by heating:
A compound among the following that is least likely to behave as a Lewis base is:
Which one of the following species has a plane triangular shape?
0.33% of iron (by weight) is present in hemoglobin (Molecular wt = 67200). The number of iron atom(s) in one molecule will be:
The maximum number of molecules is present in:
Which of the following is the most basic oxide?
The coordination compound that gives the maximum number of isomers is: