Inorganic Chemistry PYQ — Page 5

$5.33$ g of $CrCl_3 \cdot 6H_2O$, which is a $1 : 3$ electrolyte, is dissolved in water and is passed through a cation exchanger. The chloride ions in the eluted solution, on treatment with $AgNO_3$ results in $8.61$ g of $AgCl$. The ratio of moles of complex reacted and moles of $AgCl$ formed is _______ $\times 10^{-2}$. (Nearest integer) [Molar mass in g mol$^{-1}$ Cr : $52$, Ag : $108$, Cl : $35.5$, H : $1$, O : $16$]

Among $Fe^{2+}, Fe^{3+}, Cr^{2+}$ and $Zn^{2+}$, the ion that shows positive borax bead test and with highest ionisation enthalpy is:

Among the following oxides of 3 d elements, the number of mixed oxides are $\_\_\_\_$。 $\mathrm{Ti}_{2} \mathrm{O}_{3}, \mathrm{~V}_{2} \mathrm{O}_{4}, \mathrm{Cr}_{2} \mathrm{O}_{3}, \mathrm{Mn}_{3} \mathrm{O}_{4}, \mathrm{Fe}_{3} \mathrm{O}_{4}, \mathrm{Fe}_{2} \mathrm{O}_{3}, \mathrm{Co}_{3} \mathrm{O}_{4}$

The covalent radii of atoms A and B are $r_A$ and $r_B$, respectively. The covalent bond length and total length of AB molecule are respectively

Which of the following represents the correct trend for the mentioned property ? A. $\mathrm{F}>\mathrm{P}>\mathrm{S}>\mathrm{B}$ $\ \ \ $ - $\ \ \ $ First Ionization Energy B. $\mathrm{Cl}>\mathrm{F}>\mathrm{S}>\mathrm{P}$ $\ \ \ $ - $\ \ \ $ Electron Affinity C. $\mathrm{K}>\mathrm{Al}>\mathrm{Mg}>\mathrm{B}$ $\ \ \ $ - $\ \ \ $ Metallic character D. $\mathrm{K}_{2} \mathrm{O}>\mathrm{Na}_{2} \mathrm{O}>\mathrm{MgO}>\mathrm{Al}_{2} \mathrm{O}_{3} \quad$ $\ \ \ $ - $\ \ \ $ Basic character Choose the correct answer from the options given below :

Pairs of elements with the same number of electrons in their respective 4f orbital are [Atomic number. Eu-63, Gd-64, Dy-66, Ho-67, Tm-69, Yb-70, Lu-71, Hf-72] A. (Eu and Gd) B. (Dy and Ho) C. (Yb and Hf) D. (Lu and Tm) Choose the correct answer from the options given below:

Given below are two statements: Statement I: The number of pairs, from the following, in which both the ions are coloured in aqueous solution is 3. $\left[\mathrm{Sc}^{3+}, \mathrm{Ti}^{3+}\right],\left[\mathrm{Mn}^{2+}, \mathrm{Cr}^{2+}\right],\left[\mathrm{Cu}^{2+}, \mathrm{Zn}^{2+}\right]$ and $\left[\mathrm{Ni}^{2+}, \mathrm{Ti}^{4+}\right]$ Statement II: $\mathrm{Th}^{4+}$ is the strongest reducing agent among $\mathrm{Th}^{4+}, \mathrm{Ce}^{4+}, \mathrm{Gd}^{3+}$ and $\mathrm{Eu}^{2+}$. In the light of the above statements, choose the correct answer from the options given below

Identify the molecule $(X)$ with maximum number of lone pairs of electrons (obtained using Lewis dot structure) among $\mathrm{HNO}_{3}, \mathrm{H}_{2} \mathrm{SO}_{4}, \mathrm{NF}_{3}$ and $\mathrm{O}_{3}$. Choose the correct bond angle made by the central atom of the molecule $(\mathrm{X})$.

Number of paramagnetic complexes among the following is ________. $[\text{MnBr}_4]^{2-}$, $[\text{NiCl}_4]^{2-}$, $[\text{Ni(CN)}_4]^{2-}$, $[\text{Ni(CO)}_4]$, $[\text{CoF}_6]^{3-}$, $[\text{Fe(CN)}_6]^{4-}$, $[\text{Mn(CN)}_6]^{3-}$, $[\text{Ti(CN)}_6]^{3-}$, $[\text{Cu(H}_2\text{O)}_6]^{2+}$, $[\text{Co(C}_2\text{O}_4\text{)}_3]^{3-}$

$SF_4$ is isostructural with: A. $BrF_4^{\ominus}$ B. $CH_4$ C. $IF_4^{\oplus}$ D. $XeF_4$ E. $XeO_2 F_2$ Choose the correct answer from the options given below:

Consider three metal chlorides $\mathrm{x}, \mathrm{y}$ and z, where x is water soluble at room temperature, y is sparingly soluble in water at room temperature and z is soluble in hot water. $\mathrm{x}, \mathrm{y}$ and z are respectively

Given below are two statements : Statement I: Elements ' $X$ ' and ' $Y$ ' are the most and least electronegative elements, respectively among $\mathrm{N}, \mathrm{As}, \mathrm{Sb}$ and P. The nature of the oxides $\mathrm{X}_{2} \mathrm{O}_{3}$ and $\mathrm{Y}_{2} \mathrm{O}_{3}$ is acidic and amphoteric, respectively. Statement II : $\quad \mathrm{BCl}_{3}$ is covalent in nature and gets hydrolysed in water. It produces $\left[\mathrm{B}(\mathrm{OH})_{4}\right]^{-}$ and $\left[\mathrm{B}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{3+}$ in aqueous medium. In the light of the above statements, choose the correct answer from the options given below :

A chromium complex with a formula $\mathrm{CrCl}_{3} \cdot 6 \mathrm{H}_{2} \mathrm{O}$ has a spin only magnetic moment value of 3.87 BM and its solution conductivity corresponds to $1: 2$ electrolyte. 2.75 g of the complex solution was initially passed through a cation exchanger. The solution obtained after the process was reacted with excess of $\mathrm{AgNO}_{3}$. The amount of AgCl formed in the above process is $\_\_\_\_$ g. (Nearest integer) [Given: Molar mass in $\mathrm{g} \mathrm{mol}^{-1} \mathrm{Cr}: 52 ; \mathrm{Cl}: 35.5, \mathrm{Ag}: 108, \mathrm{O}: 16, \mathrm{H}: 1$]

Correct statements from the following are: A. Nitrogen in oxidation states from $+1$ to $+4$ disproportionates in acid medium. B. Nitrogen has the ability to form $d\pi - p\pi$ multiple bonds with itself and other elements with small size and high electronegativity. C. N-N single bond is stronger than P-P single bond. D. Nitrogen has highest density in its group due to small size. E. The maximum covalency of nitrogen is four since it has only four valence orbitals for bonding. Choose the correct answer from the options given below:

Given below are two statements : Statement I : Among $\left.\left[\mathrm{Cu}\left(\mathrm{NH}_{3}\right)_{4}\right]^{2+},\left[\mathrm{Ni}(\mathrm{en})_{3}\right)\right]^{2+},\left[\mathrm{Ni}\left(\mathrm{NH}_{3}\right)_{6}\right]^{2+}$ and $\left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$, $\left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$ has the maximum number of unpaired electrons. Statement II : The number of pairs among $\left\{\left[\mathrm{NiCl}_{4}\right]^{2-},\left[\mathrm{Ni}(\mathrm{CO})_{4}\right]\right\},\left\{\left[\mathrm{NiCl}_{4}\right]^{2-},\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\right\}$ and $\left\{\left[\mathrm{Ni}(\mathrm{CO})_{4}\right],\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}\right\}$ that contain only diamagnetic species is two. In the light of the above statements, choose the correct answer from the options given below : Statement I is true but Statement II is false Both Statement I and Statement II are false

The mass of iron converted into $Fe_3O_4$ by the action of $18$ g of steam is : (Given : Molar mass of H, O and Fe are $1$, $16$ and $56$ g mol$^{-1}$ respectively) Assume iron is present in excess :

The total number of unpaired electrons present in the $d^3$, $d^4$ (low spin), $d^5$ (high spin), $d^6$ (high spin) and $d^7$ (low spin) octahedral complex systems is _______.

Given below are two statements : Statement I : F$_2$O $<$ H$_2$O $<$ Cl$_2$O is the correct trend in terms of bond angle. Statement II : SiF$_4$, SnF$_4$ and PbF$_4$ are ionic in nature. In the light of the above statements, choose the correct answer from the options given below :

Given below are two statements : Statement I : Crystal Field Stabilization Energy (CFSE) of $\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$ is greater than that of $\left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$. Statement II: Potassium ferricyanide has a greater spin-only magnetic moment than sodium ferrocyanide. In the light of the above statements, choose the correct answer from the options given below :

Consider the following species: BrF$_5$, XeF$_5^-$, BF$_4^-$, ICl$_4^-$, XeF$_4$, SF$_4$, NH$_4^+$, ClF$_3$, XeF$_2$, ICl$_2^-$ Number of species having sp$^3$d hybridized central atom is __________.

The correct statements about metal carbonyls are A. The metal-carbon bonds in metal carbonyls possess both $\sigma$ and $\pi$-character. B. Due to synergic bonding interactions between metal and CO ligand, the metal-carbon bond becomes weak. C. The metal-carbon $\sigma$ bond is formed by the donation of lone pair of electrons on the carbonyl carbon into a vacant orbital of metal. D. The metal-carbon $\pi$ bond is formed by the donation of electrons from filled d-orbital of metal into vacant $\pi^*$ orbital of CO. Choose the correct answer from the options given below:

The correct statements among the following are, A. $Mo(VI)$ and $W(VI)$ are less stable than $Cr(VI)$. B. $Ce^{4+}$ and $Tb^{4+}$ are oxidant while $Eu^{2+}$ and $Yb^{2+}$ are reductant. C. $Cm$ and $Am$ have seven unpaired electrons. D. Actinoid contraction is greater from element to element than lanthanoid contraction. Choose the correct answer from the options given below:

The formal charges on the atoms marked as (1) to (4) in the Lewis representation of $\mathrm{HNO}_{3}$ molecule respectively are 

Given below are two statements: Statement I: The covalency of oxygen is generally two but it can exceed upto four. The oxidation state of oxygen in $SO_2$ is $-2$ and in $OF_2$ it is $+2$. Statement II: The anomalous behaviour of oxygen when compared to the other elements of group $16$ is due to its small size and high electronegativity. In the light of the above statements, choose the correct answer from the options given below