The processes of calcination and roasting in metallurgical industries,

Question: The processes of calcination and roasting in metallurgical industries, respectively, can lead to :-Global warming and acid rainPhotochemical smog and ozone layer depletionGlobal warming and photochemical smogPhotochemical smog and global warmingCorrect Option: 1 Solution: Due to industrial process $\mathrm{SO}_{2}$ gas is released which is responsible for acid rain \ global warming....

A sample of red ink (a colloidal suspension) is prepared by mixing eosin dye,

Question: A sample of red ink (a colloidal suspension) is prepared by mixing eosin dye, egg white, $\mathrm{HCHO}$ and water. The component which ensures stability of the ink sample is :-$\mathrm{HCHO}$Eosin dyeEgg whiteWaterCorrect Option: , 3 Solution: Egg white...

In the following reaction sequence,

Question: In the following reaction sequence, $[\mathrm{C}]$ is :- Correct Option: , 3 Solution:...

The increasing order of the acidity of the

Question: The increasing order of the acidity of the $\alpha$-hydrogen of the following compounds is : $(\mathrm{C})(\mathrm{A})(\mathrm{B})(\mathrm{D})$$(\mathrm{B})(\mathrm{C})(\mathrm{A})(\mathrm{D})$$(\mathrm{A})(\mathrm{C})(\mathrm{D})(\mathrm{B})$$(\mathrm{D})(\mathrm{C})(\mathrm{A})(\mathrm{B})$Correct Option: 4, Solution: $\mathrm{D}\mathrm{C}\mathrm{A}\mathrm{B}$...

The one that can exhibit highest paramagnetic behaviour among the following is :-

Question: The one that can exhibit highest paramagnetic behaviour among the following is :- $\mathrm{gly}=\mathrm{glycinato} ; \mathrm{bpy}=2,2^{\prime}-$ bipyridine$\left[\mathrm{Pd}(\mathrm{gly})_{2}\right]$$\left[\mathrm{Ti}\left(\mathrm{NH}_{3}\right)_{6}\right]^{3+}$$\left[\mathrm{Co}(\mathrm{OX})_{2}(\mathrm{OH})_{2}\right]^{-}\left(\Delta_{0}\mathrm{P}\right)$$\left[\mathrm{Fe}(\text { en })(\text { bpy })\left(\mathrm{NH}_{3}\right)_{2}\right]^{2+}$Correct Option: , 3 Solution: $\left[\m...

In the following reaction sequence the major products A and B are :

Question: In the following reaction sequence the major products $A$ and $B$ are : Correct Option: 1 Solution:...

Which of the following is not an essential amino acid:

Question: Which of the following is not an essential amino acid: ValineLeucineLysineTyrosineCorrect Option: , 4 Solution: Tyrosine is not an essential amino acid....

The reaction in which the hybridisation of the underlined atom is affected is :-

Question: The reaction in which the hybridisation of the underlined atom is affected is :-$\underline{\mathrm{NH}_{3}} \stackrel{\mathrm{H}^{*}}{\longrightarrow}$$\underline{\mathrm{XeF}}_{4}+\mathrm{SbF}_{5} \rightarrow$$\mathrm{H}_{2} \underline{\mathrm{S}} \mathrm{O}_{4}+\mathrm{NaCl} \stackrel{420 \mathrm{~K}}{\longrightarrow}$$\mathrm{H}_{3} \mathrm{PO}_{2} \stackrel{\text { Dispropartionation }}{\longrightarrow}$Correct Option: , 2 Solution: $\mathrm{XeF}_{4}+\mathrm{SbF}_{5} \rightarrow\l...

The values of the crystal field stabilization energies for a high spin

Question: The values of the crystal field stabilization energies for a high spin $\mathrm{d}^{6}$ metal ion in octahedral and tetrahedral fields, respectively, are:$-0.4 \Delta_{0}$ and $-0.27 \Delta_{\mathrm{t}}$$-1.6 \Delta_{0}$ and $-0.4 \Delta_{\mathrm{t}}$$-0.4 \Delta_{0}$ and $-0.6 \Delta_{\mathrm{t}}$$-2.4 \Delta_{0}$ and $-0.6 \Delta_{t}$Correct Option: , 3 Solution: For high spin octahedral field $\mathrm{CFSE}=(4)\left(-0.4 \Delta_{0}\right)+2\left(0.6 \Delta_{0}\right)=-0.4 \Delta_{0}...

Consider the following reaction

Question: Consider the following reaction $\mathrm{N}_{2} \mathrm{O}_{4}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NO}_{2}(\mathrm{~g}) ; \Delta \mathrm{H}^{0}=+58 \mathrm{~kJ}$ For each of the following cases $(a, b)$, the direction in which the equilibrium shifts is: (a) Temperature is decreased (b) Pressure is increased by adding $\mathrm{N}_{2}$ at constant $\mathrm{T}$ (a) towards reactant, (b) no change(a) towards product, (b) towards reactant(a) towards product, (b) no change(a) towards r...

An alkaline earth metal 'M' readily forms water soluble sulphate and water insoluble hydroxide.

Question: An alkaline earth metal 'M' readily forms water soluble sulphate and water insoluble hydroxide. Its oxide MO is very stable to heat and does not have rock-salt structure. $\mathrm{M}$ is :-$\mathrm{Ca}$Be$\mathrm{Mg}$$\mathrm{Sr}$Correct Option: , 2 Solution: [Be] $\mathrm{BeSO}_{4}$ is water soluble $\mathrm{Be}(\mathrm{OH})_{2}$ is water insoluble $\mathrm{BeO}$ is stable to heat...

The mechanism of action of "Terfenadine" (Seldane) is :-

Question: The mechanism of action of "Terfenadine" (Seldane) is :-Activates the histamine receptorInhibits the secretion of histamineInhibits the action of histamine receptorHelps in the secretion of histamineCorrect Option: , 3 Solution: Seldane is an antihistamine drugs it inhibits the action of histamine receptor....

The equation that represents the water-gas shift reaction is :

Question: The equation that represents the water-gas shift reaction is :$\mathrm{CO}(\mathrm{g})+\mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \underset{\text { Catalyst }}{\stackrel{673 \mathrm{~K}}{\longrightarrow}} \mathrm{CO}_{2}(\mathrm{~g})+\mathrm{H}_{2}(\mathrm{~g})$$\mathrm{CH}_{4}(\mathrm{~g})+\mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \stackrel{1270 \mathrm{~K}}{\mathrm{Ni}} \mathrm{CO}(\mathrm{g})+3 \mathrm{H}_{2}(\mathrm{~g})$$\mathrm{C}(\mathrm{s})+\mathrm{H}_{2} \mathrm{O}(\mathrm{g}) \stackre...

The crystal Field stabilization Energy (CFSE) of

Question: The crystal Field stabilization Energy (CFSE) of $\left[\operatorname{CoF}_{3}\left(\mathrm{H}_{2} \mathrm{O}\right)_{3}\right]\left(\Delta_{0}\mathrm{P}\right)$ is :-$-0.8 \Delta_{0}$$-0.4 \Delta_{0}+\mathrm{P}$$-0.8 \Delta_{0}+2 \mathrm{P}$$-0.4 \Delta_{0}$Correct Option: , 4 Solution: $\left[\mathrm{CoF}_{3}\left(\mathrm{H}_{2} \mathrm{O}\right)_{3}\right] \quad \Delta_{0}\mathrm{P}$ Means all ligands behaves as weak field ligands $=[-0.4 \times 4+0.6 \times 2] \Delta_{0}$ $=[-1.6+1...

The process that is NOT endothermic in nature is :-

Question: The process that is NOT endothermic in nature is :-$\mathrm{Ar}_{(g)}+\mathrm{e}^{-} \rightarrow \mathrm{Ar}_{(\xi)}^{-}$$\mathrm{H}_{(\mathrm{g})}+\mathrm{e}^{-} \rightarrow \mathrm{H}_{(\mathrm{g})}^{-}$$\mathrm{Na}_{(z)} \rightarrow \mathrm{Na}_{(z)}^{+}+\mathrm{e}$$\mathrm{O}_{(\mathrm{g})}^{-}+\mathrm{e}^{-} \rightarrow \mathrm{O}_{(\mathrm{g})}^{2-}$Correct Option: , 2 Solution: $\mathrm{H}_{(\mathrm{g})}+\mathrm{e}^{-} \rightarrow \mathrm{H}^{-} \quad$ is exothermic rest of all ...

Five moles of an ideal gas at 1 bar and 298k is expanded

Question: Five moles of an ideal gas at 1 bar and $298 \mathrm{~K}$ is expanded into vacuum to double the volume. The work done is :-$\mathrm{C}_{\mathrm{v}}\left(\mathrm{T}_{2}-\mathrm{T}_{1}\right)$$-\mathrm{RT} \ln \mathrm{V}_{2} / \mathrm{V}_{1}$$-\mathrm{RT}\left(\mathrm{V}_{2}-\mathrm{V}_{1}\right)$zeroCorrect Option: , 4 Solution: As the expansion is done in vaccum that is in absence of $\mathrm{p}_{\mathrm{ext}}$ so $\mathbf{W}=$ zero...

If the equilibrium constant for A ⇌ B + C is

Question: If the equilibrium constant for $\mathrm{A} \rightleftharpoons \mathrm{B}+\mathrm{C}$ is $\mathrm{K}_{\mathrm{eq}}^{(1)}$ and that of $\mathrm{B}+\mathrm{C} \rightleftharpoons \mathrm{P}$ is $\mathrm{K}_{\mathrm{eq}}^{(2)}$, the equilibrium constant for $\mathrm{A} \rightleftharpoons \mathrm{P}$ is :-$\mathrm{K}_{e q}^{(2)}-\mathrm{K}_{e q}^{(1)}$$\mathrm{K}_{e q}^{(1)} \mathrm{K}_{e q}^{(2)}$$\mathrm{K}_{\text {eq }}^{(1)} / \mathrm{K}_{\text {eq }}^{(2)}$$\mathrm{K}_{\mathrm{eq}}^{(1...

At 300K, the vapour pressure of a solution containing

Question: At $300 \mathrm{~K}$, the vapour pressure of a solution containing 1 mole of n-hexane and 3 moles of n-heptane is $550 \mathrm{~mm}$ of Hg. At the same temperature, if one more mole of n-heptane is added to this solution, the vapour pressure of the solution increases by $10 \mathrm{~mm}$ of Hg. What is the vapour pressure in $\mathrm{mm} \mathrm{Hg}$ of n-heptane in its pure state_________ ? Solution: $550=\mathrm{P}_{\mathrm{A}}^{\circ} \times \frac{1}{4}+\mathrm{P}_{\mathrm{B}}^{\cir...

If 75% of a first order reaction was completed in 90 minutes,

Question: If $75 \%$ of a first order reaction was completed in 90 minutes, $60 \%$ of the same reaction would be completed in approximately (in minutes)________. (Take : $\log 2=0.30 ; \log 2.5=0.40$ ) Solution: $\mathrm{t}_{0.75}=2 \times \frac{\ln 2}{\mathrm{k}}=90$ $\mathrm{k}=\frac{\ln 2}{45} \mathrm{~min}^{-1}$ $\mathrm{kt}=\ln \frac{1}{1-0.6}=\ln 2.5$ $\frac{\ln 2}{45} \times \mathrm{t}=\ln 2.5$ $\mathrm{t}=45 \times \frac{\log 2.5}{\log 2}=45 \times \frac{0.4}{0.3}=60 \mathrm{~min}$...

A 20.0 ml solution containing 0.2 g impure

Question: A $20.0 \mathrm{~mL}$ solution containing $0.2 \mathrm{~g}$ impure $\mathrm{H}_{2} \mathrm{O}_{2}$ reacts completely with $0.316 \mathrm{~g}$ of $\mathrm{KMnO}_{4}$ in acid solution. The purity of $\mathrm{H}_{2} \mathrm{O}_{2}$ (in \%) is __________(mol. wt. of $\mathrm{H}_{2} \mathrm{O}_{2}=34 ;$ mol. wt. of$\left.\mathrm{KMnO}_{4}=158\right)$ Solution: $\mathrm{Eq}$ of $\mathrm{H}_{2} \mathrm{O}_{2}=\mathrm{Eq}$ of $\mathrm{KMnO}_{4}$ $x \times 2=\frac{0.316}{158} \times 5$ $x=5 \ti...

The number of chiral centres present in [B] is

Question: The number of chiral centres present in [B] is_______. Solution:...

The mass of ammonia in grams produced when 2.8kg

Question: The mass of ammonia in grams produced when $2.8 \mathrm{~kg}$ of dinitrogen quantitatively reacts with $1 \mathrm{~kg}$ of dihydrogen is_____. Solution: $\mathrm{N}_{2}+3 \mathrm{H}_{2} \rightarrow 2 \mathrm{NH}_{3}$...

The pair in which both the species have the same magnetic moment (spin only) is :

Question: The pair in which both the species have the same magnetic moment (spin only) is :$\left[\mathrm{Mn}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$ and $\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)\right]^{2+}$$\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$ and $\left[\mathrm{CoCl}_{4}\right]^{2-}$$\left[\mathrm{Cr}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{2+}$ and $\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right]^{...

For one mole of an ideal gas,

Question: For one mole of an ideal gas, which of these statements must be true ? (a) $\mathrm{U}$ and $\mathrm{H}$ each depends only on temperature (b) Compressibility factor $\mathrm{z}$ is not equal to 1 (c) $\mathrm{C}_{\mathrm{P}, \mathrm{m}}-\mathrm{C}_{\mathrm{V}, \mathrm{m}}=\mathrm{R}$ (d) $\mathrm{dU}=\mathrm{C}_{\mathrm{V}} \mathrm{dT}$ for any process(a), (c) and (d)(b), (c) and (d)(c) and (d)(a) and (c)Correct Option: 1 Solution: For ideal Gas $\# \mathrm{U}=\mathrm{f}(\mathrm{T}), \...

Question: The number of groups present in a tripeptide Asp - Glu - Lys is Solution: Structure of Tri peptide Asp - Glu - Lys...