Inorganic Chemistry PYQ — Page 2

A student has been given 0.314 g of an organic compound and asked to estimate Sulphur. During the experiment, the student has obtained 0.4813 g of barium sulphate. The percentage of sulphur present in the compound is $\_\_\_\_$. (Given Molar mass in $\mathrm{g} \mathrm{mol}^{-1} \mathrm{~S}: 32, \mathrm{BaSO}_{4}: 233$)

Consider a mixture ' X ' which is made by dissolving 0.4 mol of $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{SO}_{4}\right] \mathrm{Br}$ and 0.4 mol of $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{5} \mathrm{Br}\right] \mathrm{SO}_{4}$ in water to make 4 L of solution. When 2 L of mixture ' X ' is allowed to react with excess of $\mathrm{AgNO}_{3}$, it forms precipitate ' Y '. The rest 2 L of mixture ' X ' reacts with excess $\mathrm{BaCl}_{2}$ to form precipitate ' Z '. Which of the following statements is CORRECT?

Given below are two statements for catalytic properties of transition metals. Statement I: First row transition metals which act as catalyst utilise their 3d electrons only for formation of bonds between reactant molecules and atoms on the surface of catalyst. Statement II: There is increase in the concentration of reactants on the surface of catalyst which strengthens the bonds in reacting molecules. In the light of the above statements, choose the correct answer from the options given below:

Consider the following reactions. $\mathrm{PbCl}_{2}+\mathrm{K}_{2} \mathrm{CrO}_{4} \rightarrow \mathrm{~A}+2 \mathrm{KCl}$ (Hot solution) $\mathrm{A}+\mathrm{NaOH} \rightleftharpoons \mathrm{B}+\mathrm{Na}_{2} \mathrm{CrO}_{4}$ $\mathrm{PbSO}_{4}+4 \mathrm{CH}_{3} \mathrm{COONH}_{4} \rightarrow\left(\mathrm{NH}_{4}\right)_{2} \mathrm{SO}_{4}+\mathrm{X}$ In the above reactions, $\mathrm{A}, \mathrm{B}$ and X are respectively.

In the Group analysis of cations, $\mathrm{Ba}^{2+} ~\&~ \mathrm{Ca}^{2+}$ are precipitated respectively as

The correct statements among the following are. A. Basic vanadium oxide is used in the manufacture of $\text{H}_2\text{SO}_4$. B. The spin-only magnetic moment value of the transition metal halide employed in Ziegler-Natta polymerization is $2.84$ BM. C. The p-block metal compound employed in Ziegler-Natta polymerization has the metal in $+3$ oxidation state. D. The number of electrons present in the outer most 'd' orbital of metal halide employed in Wacker process is $8$. Choose the correct answer from the options given below:

Given below are two statements: Statement I: Among $Zn, Mn, Sc$ and $Cu$, the energy required to remove the third valence electron is highest for $Zn$ and lowest for $Sc$. Statement II: The correct order of the following complexes in terms of CFSE is $[Co(H_2 O)_6]^{2+} < [Co(H_2 O)_6]^{3+} < [Co(en)_3]^{3+}$. In the light of the above statements, choose the correct answer from the options given below:

Given below are two statements: Statement I: The number of pairs among $[\text{Ti}^{4+}, \text{V}^{2+}]$, $[\text{V}^{2+}, \text{Mn}^{2+}]$, $[\text{Mn}^{2+}, \text{Fe}^{3+}]$ and $[\text{V}^{2+}, \text{Cr}^{2+}]$ in which both ions are coloured is $3$. Statement II: The number of pairs among $[\text{La}^{3+}, \text{Yb}^{2+}]$, $[\text{Lu}^{3+}, \text{Ce}^{4+}]$ and $[\text{Ac}^{3+}, \text{Lr}^{3+}]$ ions in which both are diamagnetic is $3$. In the light of the above statements, choose the correct from the options given below:

Given below are two statements: Statement I: The number of paramagnetic species among $\left[\mathrm{CoF}_{6}\right]^{3-},\left[\mathrm{TiF}_{6}\right]^{3-}$, $\mathrm{V}_{2} \mathrm{O}_{5}$ and $\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]^{3-}$ is 3. Statement II: $\mathrm{K}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]<\mathrm{K}_{3}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]<\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{SO}_{4} \cdot \mathrm{H}_{2} \mathrm{O}<\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{3}$ is the correct order in terms of number of unpaired electron(s) present in the complexes. In the light of the above statements, choose the correct answer from the options given below

Regarding the hydrides of group 15 elements $\mathrm{EH}_{3}(\mathrm{E}=\mathrm{N}, \mathrm{P}, \mathrm{As}, \mathrm{Sb})$, select the correct statement from the following: A. The stability of hydrides decreases down the group. B. The basicity of hydrides decreases down the group. C. The reducing character increases down the group. D. The boiling point increases down the group. Choose the correct answer from the options given below:

Match List-I with List-II.<table class="pyq-table"><tbody><tr><th>List-I Electronic configuration of neutral atom (where $n=2$)</th><th>List-II $1^{st}$ Ionization Energy (kJ mol$^{-1}$)</th></tr><tr><td>A. $ns^2$</td><td>I. $2080$</td></tr><tr><td>B. $ns^2np^1$</td><td>II. $899$</td></tr><tr><td>C. $ns^2np^3$</td><td>III. $800$</td></tr><tr><td>D. $ns^2np^6$</td><td>IV. $1402$</td></tr></tbody></table>Choose the correct answer from the options given below:

Which of the following sets includes all the species that will change the orange colour of $K_2Cr_2O_7$ in acidic medium?

Given below are two statements: Statement I: Hybridisation, shape and spin only magnetic moment of $\mathrm{K}_{3}\left[\mathrm{Co}\left(\mathrm{CO}_{3}\right)_{3}\right]$ is $\mathrm{sp}^{3} \mathrm{~d}^{2}$, octahedral and 4.9 BM respectively. Statement II: Geometry, hybridisation and spin only magnetic moment values $(\mathrm{BM})$ of the ions $\left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-},\left[\mathrm{MnBr}_{4}\right]^{2-}$ and $\left[\mathrm{CoF}_{6}\right]^{3-}$ respectively are square planar, tetrahedral, octahedral; $\mathrm{dsp}^{2}, \mathrm{sp}^{3}, \mathrm{sp}^{3} \mathrm{~d}^{2}$ and $0,5.9,4.9$. In the light of the above statements, choose the correct answer from the options given below

The correct increasing order of $C-H(A), C-O(B), C=O(C)$ and $C \equiv N(D)$ bonds in terms of covalent bond length is:

Given below are two statements : Statement I : The number of pairs among $\left[\mathrm{SiO}_{2}, \mathrm{CO}_{2}\right],\left[\mathrm{SnO}, \mathrm{SnO}_{2}\right],\left[\mathrm{PbO}, \mathrm{PbO}_{2}\right]$ and $\left[\mathrm{GeO}, \mathrm{GeO}_{2}\right]$, which contain oxides that are both amphoteric is 2. Statement II: $\mathrm{BF}_{3}$ is an electron deficient molecule, can act as a Lewis acid, forms adduct with $\mathrm{NH}_{3}$ and has a trigonal planar geometry. In the light of the above statements, choose the correct answer from the options given below :

Given below are two statements : Statement I : The increasing order of boiling point of hydrogen halides is $\mathrm{HCl}<\mathrm{HBr}<\mathrm{HI}<\mathrm{HF}$. Statement II : The increasing order of melting point of hydrogen halides is $\mathrm{HCl}<\mathrm{HBr}<\mathrm{HF}<\mathrm{HI}$. In the light of the above statements, choose the correct answer from the options given below :

The oxidation state of chromium in the final product formed in the reaction between KI and acidified $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ solution is:

On heating a mixture of common salt and $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ in equal amount along with concentrated $\mathrm{H}_{2} \mathrm{SO}_{4}$ in a test tube, a gas is evolved. Formula of the gas evolved and oxidation state of the central metal atom in the gas respectively are:

The correct statements from the following are : A. Ionic radii of trivalent cations of group 13 elements decreases down the group. B. Electronegativity of group 13 elements decreases down the group. C. Among the group 13 elements, Boron has highest first ionisation enthalpy. D. The trichloride and triiodide of group 13 elements are covalent in nature. Choose the correct answer from the options given below :

Given below are two statements: Statement I: The number of species among $\mathrm{BF}_{4}{ }^{-}, \mathrm{SiF}_{4}, \mathrm{XeF}_{4}$ and $\mathrm{SF}_{4}$, that have unequal $\mathrm{E}-\mathrm{F}$ bond lengths is two. Here, E is the central atom. Statement II: Among $\mathrm{O}_{2}^{-}, \mathrm{O}_{2}{ }^{2-}, \mathrm{F}_{2}$ and $\mathrm{O}_{2}{ }^{+}, \mathrm{O}_{2}^{-}$has the highest bond order. In the light of the above statements, choose the correct answer from the options given below

Number of paramagnetic ions among the following d- and f-block metal ions is _______. $Mn^{2+}, Cu^{2+}, Zn^{2+}, Yb^{2+}, Sc^{3+}, La^{3+}, Gd^{3+}, Lu^{3+}, Ti^{4+}, Ce^{4+}$ (Atomic number of $Mn = 25, Cu = 29, Zn = 30, Yb = 70, Sc = 21, La = 57, Gd = 64, Lu = 71, Ti = 22, Ce = 58$)

Given below are two statements : Statement I: The first ionization enthalpy of Cr is lower than that of Mn . Statement II: The second and third ionization enthalpies of Cr are higher than those of Mn. In the light of the above statements, choose the correct answer from the options given below :

Which of the following elements has the highest electronegativity?

According to Lewis theory, the total number of $\sigma$ bond-pairs and lone pair of electrons around the central atom of $XeO_6^{4-}$ ion is _____.