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The catalytic activity of transition metals and their compounds is ascribed mainly to:
Identify the incorrect statement.
Zinc can be coated on iron to produce galvanised iron, but the reverse is not possible because:
For a cell involving one electron $E^\circ_{cell} = 0.59\text{ V}$ at $298\text{ K}$, the equilibrium constant for the cell reaction is : [Given that $\frac{2.303 RT}{F} = 0.059\text{ V at } T = 298\text{ K}$]
Gadolinium belongs to 4f series. It’s atomic number is $64$. Which of the following is the correct electronic configuration of gadolinium?
Find out the solubility of $Ni(OH)_2$ in 0.1 M $NaOH$. Given that the ionic product of $Ni(OH)_2$ is $2 \times 10^{-15}$
Which one is malachite from the following?
Which of the following processes does not involve the oxidation of iron?
The behaviour of samarium ($Z=62$) is very much like europium ($Z=63$), since both elements:
The common oxidation state shown by actinoids is +3 with the other oxidation states being +4, +5, +6, and +7. Rank the following elements in decreasing order of the number of oxidation states they display: A. Np ($Z=93$) B. Am ($Z=95$) C. Ac ($Z=89$) D. Pa ($Z=91$) Choose the correct answer from the options given below:
In acidic medium, $\text{H}_2\text{O}_2$ changes $\text{Cr}_2\text{O}_7^{2-}$ to $\text{CrO}_5$ which has two (–O – O–) bonds. The oxidation state of $\text{Cr}$ in $\text{CrO}_5$ is:
The general electronic configuration of lanthanoids is:
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?
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:
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.
In which of the following pairs, both the species are not isostructural?
Al2O3 can be converted to anhydrous AlCl3 by heating: