Inorganic Chemistry PYQ — Page 22

Compound A reacts with ${\mathrm{NH}}_{4}\mathrm{Cl}$ and forms a compound B. Compound B reacts with ${H}_{2}O$ and excess of ${\mathrm{CO}}_{2}$ to form compound C which on passing through or reaction with saturated NaCl solution forms sodium hydrogen carbonate. Compound A. B and C, are respectively.

The complex that dissolves in water is

Given below are two statements: one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A): The first ionization enthalpy of $3d$ series elements is more than that of group $2$ metals Reason (R): In $3d$ series of elements successive filling of $d$-orbitals takes place. In the light of the above statements, choose the correct answer from the options given below:

The total number of lone pairs of electrons on oxygen atoms of ozone is

The correct group of halide ions which can be oxidised by oxygen in acidic medium is

“$A$” obtained by Ostwald's method involving air oxidation of ${\mathrm{NH}}_{3}$, upon further air oxidation produces “$B$”. “$B$” on hydration forms an oxoacid of Nitrogen along with evolution of “$A$”. The oxoacid also produces “$A$” and gives positive brown ring test

Which one of the following elements will remain as liquid inside pure boiling water?

Which of the following elements have half-filled f-orbitals in their ground state ? (Given : atomic number $\mathrm{Sm}-62;\mathrm{Eu}=63;\mathrm{Tb}=65;\mathrm{Gd}=64,\mathrm{Pm}=61$) Choose the correct answer from the options given below :

During the qualitative analysis of ${\mathrm{SO}}_{3}^{2-}$ using dilute ${H}_{2}{\mathrm{SO}}_{4},{\mathrm{SO}}_{2}$ gas is evolved which turns ${K}_{2}{\mathrm{Cr}}_{2}{O}_{7}$ solution (acidified with dilute ${H}_{2}{\mathrm{SO}}_{4}$):

When ${\mathrm{Cu}}^{2+}$ ion is treated with $\mathrm{KI}$, a white precipitate, $X$ appears in solution. The solution is titrated with sodium thiosulphate, the compound $Y$ is formed. $X$ and $Y$ respectively are

Given below are two statements : Statement-I : Methane and steam passed over a heated $\mathrm{Ni}$ catalyst produces hydrogen gas. Statement-II : Sodium nitrite reacts with ${\mathrm{NH}}_{4}\mathrm{Cl}$ to give ${H}_{2}O,{N}_{2}$ and $\mathrm{NaCl}$. In the light of the above statements, choose the most appropriate answer from the options given below :

The Lewis acid character of boron tri halides follows the order:

Match List-I with List-II<table class="pyq-table"><tbody><tr><td></td><td>LIST-I Coordination Complex</td><td></td><td>LIST-II Number of unpaired electrons</td></tr><tr><td>A.</td><td>${[\mathrm{Cr}(\mathrm{CN}{)}_{6}]}^{3-}$</td><td>I.</td><td>0</td></tr><tr><td>B.</td><td>${[\mathrm{Fe}{({H}_{2}O)}_{6}]}^{2+}$</td><td>II.</td><td>3</td></tr><tr><td>C.</td><td>${[\mathrm{Co}{({\mathrm{NH}}_{3})}_{6}]}^{3+}$</td><td>III.</td><td>2</td></tr><tr><td>D.</td><td>${[\mathrm{Ni}{({\mathrm{NH}}_{3})}_{6}]}^{2+}$</td><td>IV.</td><td>4</td></tr></tbody></table>Choose the correct answer from the options given below:

Which of the following statements are not correct? A. The electron gain enthalpy of $F$ is more negative than that of $\mathrm{Cl}.$ B. Ionization enthalpy decreases in a group of periodic table. C. The electronegativity of an atom depends upon the atoms bonded to it. D. ${\mathrm{Al}}_{2}{O}_{3}$ and $\mathrm{NO}$ are examples of amphoteric oxides. Choose the most appropriate answer from the options given below:

Prolonged heating is avoided during the preparation of ferrous ammonium sulphate to

In the wet tests for detection of various cations by precipitation, ${\mathrm{Ba}}^{2+}$ cations are detected by obtaining precipitate of

If the CFSE of ${[\mathrm{Ti}{({H}_{2}O)}_{6}]}^{3+}$ is $-96.0\mathrm{kJ}/\mathrm{mol}$, this complex will absorb maximum at wavelength $\mathrm{nm}$. (nearest integer) Assume Planck' constant $(h)=6.4\times {10}^{-34}\mathrm{Js}$, Speed of light $(c)=3.0\times {10}^{8}m/s$ and Avogadro's constant $({N}_{A})=6\times {10}^{23}/\mathrm{mol}$.

$1L,0.02M$ solution of $[\mathrm{Co}{({\mathrm{NH}}_{3})}_{5}{\mathrm{SO}}_{4}]\mathrm{Br}$ is mixed with $1L,0.02M$ solution of $[\mathrm{Co}{({\mathrm{NH}}_{3})}_{5}\mathrm{Br}]{\mathrm{SO}}_{4}$. The resulting solution is divided into two equal parts $(X)$ and treated with excess ${\mathrm{AgNO}}_{3}$ solution and ${\mathrm{BaCl}}_{2}$ solution respectively as shown below: $1L$ Solution $(X)+{\mathrm{AgNO}}_{3}$ solution (excess) $\rightarrow Y$ $1L$ Solution $(X)+{\mathrm{BaCl}}_{2}$ solution (excess) $\rightarrow Z$ The number of moles of $Y$ and $Z$ respectively are

Element not present in Nessler’s reagent is

Which halogen is known to cause the reaction given below?

The oxidation sate of phosphorus in hypophosphoric acid is

The bond dissociation energy is highest for

The number of paramagnetic species from the following is ${[\mathrm{Ni}(\mathrm{CN}{)}_{4}]}^{2-},[\mathrm{Ni}(\mathrm{CO}{)}_{4}],{[{\mathrm{NiCl}}_{4}]}^{2-}$ ${[\mathrm{Fe}(\mathrm{CN}{)}_{6}]}^{4-},{[\mathrm{Cu}{({\mathrm{NH}}_{3})}_{4}]}^{2+}$ ${[\mathrm{Fe}(\mathrm{CN}{)}_{6}]}^{3-}\text{ and }{[\mathrm{Fe}{({H}_{2}O)}_{6}]}^{2+}$

Which element is not present in Nessler’s reagent?