Inorganic Chemistry PYQ — Page 3

A ' p '-block element $(\mathrm{E})$ and hydrogen form a binary cation $\left(\mathrm{EH}_{\mathrm{x}}\right)^{+}$, while $\mathrm{EH}_{3}$ on treatment with $\mathrm{K}_{2} \mathrm{HgI}_{4}$ in alkaline medium gives a precipitate of basic mercury(II)amido-iodine. Given below are first ionisation enthalpy values $\left(\mathrm{kJ} \mathrm{mol}^{-1}\right)$ for first element each from group 13, 14, 15 and 16. Identify the correct first ionisation enthalpy value for element E.

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 :

Treatment of a gas '$X$' with a freshly prepared ferrous sulphate solution gives a compound '$Y$' as a brown ring. The compounds $X$ and $Y$ are.

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 correct order of first $(\Delta_i H_1)$ and second $(\Delta_i H_2)$ ionisation enthalpy values of Cr and Mn are : A. $\Delta_i H_1 :$ Cr $>$ Mn B. $\Delta_i H_2 :$ Cr $>$ Mn C. $\Delta_i H_1 :$ Mn $>$ Cr D. $\Delta_i H_2 :$ Mn $>$ Cr 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 $Mn = 25, Cu = 29, Zn = 30, Yb = 70, Sc = 21, La = 57, Gd = 64, Lu = 71, Ti = 22, Ce = 58$)

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:

The electronegativity of a group 13 element 'E' is same as that of Ge (on Pauling scale and upto one decimal point). The CORRECT statements about $E^{3+}$ are A. It can act as a reducing agent. B. It can act as an oxidizing agent. C. $E^{3+}$ is more stable than $E^+$. D. The standard electrode potential value for $E^{3+}/E$ is positive. Choose the correct answer from the options given below:

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

The correct order of $\mathrm{C}, \mathrm{N}, \mathrm{O}$ and F in terms of second ionisation potential is

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 _____.

Consider the transition metal ions $\mathrm{Mn}^{3+}, \mathrm{Cr}^{3+}, \mathrm{Fe}^{3+}$ and $\mathrm{Co}^{3+}$ and all form low spin octahedral complexes. The correct decreasing order of unpaired electrons in their respective d-orbitals of the complexes is

The crystal field splitting energy of $\left[\mathrm{Co}(\text { oxalate })_{3}\right]^{3-}$ complex is ' $\mathrm{n}^{\prime}$ times that of the $\left[\mathrm{Cr}(\text { oxalate })_{3}\right]^{3-}$ complex. Here ' $\mathrm{n}^{\prime}$ is $\_\_\_\_$. (Assume $\Delta_{0} \gg \mathrm{P}$)

Given below are some of the statements about Mn and $\mathrm{Mn}_{2} \mathrm{O}_{7}$. Identify the correct statements. A. Mn forms the oxide $\mathrm{Mn}_{2} \mathrm{O}_{7}$, in which Mn is in its highest oxidation state. B. Oxygen stabilizes the Mn in higher oxidation states by forming multiple bonds with Mn. C. $\mathrm{Mn}_{2} \mathrm{O}_{7}$ is an ionic oxide. D. The structure of $\mathrm{Mn}_{2} \mathrm{O}_{7}$ consists of one bridged oxygen. Choose the correct answer from the options given below :

A salt with few drops of conc. HCl gives apple green colour in flame test. The group precipitate of the salt is dissolved in acetic acid and treated with $K_2CrO_4$ to give yellow precipitate. When the sodium carbonate extract of the salt solution is heated with conc. $HNO_3$ and ammonium molybdate, it resulted a canary yellow precipitate. The cation and anion present in the salt are respectively,