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A pair among the following that have the same size is:
Which of the following species is colourless?
Identify the incorrect statement among the following:
The catalytic activity of transition metals and their compounds is ascribed mainly to:
Gadolinium has a low value of third ionisation enthalpy because of:
Identify the incorrect statement.
Which of the following ions displays the d-d transition and paramagnetism?
Zinc can be coated on iron to produce galvanised iron, but the reverse is not possible because:
When copper is heated with conc. $\text{HNO}_3$ it produces:
The electronic configurations of $\text{Eu}$ (Atomic no. $63$), $\text{Gd}$ (Atomic no. $64$), and $\text{Tb}$ (Atomic no. $65$) are, respectively:
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?
Assertion (A): Ionization enthalpy increases along each series of transition elements from left to right. However, small variations occur. Reason (R): There is a corresponding increase in nuclear charge which accompanies the filling of electrons in the inner $d$-orbitals.
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:
Match List-I with List-II: **List-I (Element)** (A) Fe (B) V (C) Mn (D) Ti **List-II (Most Common oxidation state/s)** (I) +2, +7 (II) +3, +2 (III) +4 (IV) +5 Choose the correct answer from the options given below:
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:
The shape of $Fe(CO)_5$ is: