Recent questions in Chemistry

Transition metals are often paramagnetic owing to

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Variable valency is shown by

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Lanthanides and actinides resemble in

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Which forms coloured salts.

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Which occurs in nature in free state

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Which of the following statement is not correct.

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Which one of the following is reduced by hydrogen peroxide in acid medium

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Which one of the following is highest melting halide.

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The atomic numbers of the f-block elements are:

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Match the following:

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Consider the following statement, which of the following choices is correct?

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Match the following catalysts to the transition metal used.

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For making good quality mirrors, plates of float glass are used. These are obtained by floating molten glass over a liquid metal which odes not solidify before glass. The metal used can be?

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The standard reduction potentials (E$^{\circ}$ ) of the lanthanides for M$^{+3}$ (aq) + 3e$^{-} \overset{\Delta} \rightarrow$ M (s) all fall between –2.52 V (La) and –2.25 V (Lu). This helps explain which of the following properties of Lanthanides?

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Formation of interstitial compounds makes the transition metal more:

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Match the following, where EAN stands for Effective Atomic Number, the number of electrons on the central metal ion, including ligands in the bonding:

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Which of the following statements about magnetic properties is/are incorrect?

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The photo electric emission requires a threshold frequency $V_o$. For a certain metal $\lambda_1$ = 2200 $\overset{\circ}{A}$ and $\lambda_2$ = 1900 $\overset{\circ}{A}$ produce electrons with a maximum kinetic energy $KE_1$ and $KE_2$. If $KE_2 = 2KE_1$. Calculate $V_o$ and corresponding $\lambda_o$.

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If a transition-metal compound absorbs violet radiation of the visible region, its colour would be?

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What is the spin only magnetic moment value in Bohr magneton unit for $K_2Co(SCN)_4$?

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What is the spin only magnetic moment value in (Bohr Magneton units) of Cr(CO)$_6$?

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Which of the following ions is expected to be colourless - $Ti^{4+}, Cu^{2+}, V^{3+}$ and $Fe^{2+}$?

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Calculate the largest wavelength which can remove the electron from 1 Bohr's orbit. Given $E_1$ = 13.6 eV

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The Atomic numbers of Mn, Fe and Co are 25, 26 and 27 respectively. The order of Magnetic moments among the following is

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The radius of (Atomic number of La = 57) is 1.06 A. Which one of the following given values will be closest to the radius of Lu$^{3+}$? Note: Atomic radius of Lu = 71.

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The electronic configuration of chromium in its ground state is

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Math the following Groups with respect to its electron configuration:

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What happens when a solution of potassium chromate is treated with excess dil. Nitric acid?

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In lanthanides the differentiating electron enters into

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For the given elements and their atomic numbers, which of these have the highest second ionization enthalpy?

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Arrange La$^{3+}$, Pm$^{3+}$, Yb$^{3+}$ and Ce$^{3+}$ in order of increasing ionic radii

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Which of the following ions has the maximum magnetic moment?

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Calculate the expected magnetic moment of a salt where Manganese is in the +II state?

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Rare earth elements are generally called as

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Which of the following statements regarding the catalytic properties of transition metals are CORRECT?

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Which of the following transition elements are used in the preparation of $NH_3$ by haber's process?

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Which of the following statements about iron is INCORRECT given that Iron exhibits +2 and + 3 oxidation states.

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Which of the following is an example of Disproportionation of an oxidation state, in which a single substance is simultaneously reduced and oxidized to form two different products one with a higher oxidation state and one with a lower oxidation state?

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What is the oxidation number of the transition metal in the complex ion [Co(H$_2$O)$_5$Cl]$^{+}$?

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The main reason d-block elements exhibit a large number of oxidation states compared to f-block elements is because:

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What is the oxidation state of Cobalt in CoBr$_2$?

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The transition element which does not show variable oxidation state is

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Highest oxidation state exhibited by a 3d-metal is

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What is the oxidation state of Fe in FeCl$_3$?

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Which of the following salts are colourless?

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The electronic configuration of divalent cation of Eu is

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Which of the following is a lanthanide element?

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The most common oxidation states of Gold are:

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Which of the following is a lanthanide?

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The 2 most common oxidation states shown by cerium are

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