An aromatic compound 'A' having molecular formula
Question: An aromatic compound 'A' having molecular formula $\mathrm{C}_{7} \mathrm{H}_{6} \mathrm{O}_{2}$ on treating with aqueous ammonia and heating forms compound ' $B$ '. The compound ' $B$ ' on reaction with molecular bromine and potassium hydroxide provides compound ' $C^{\prime}$ having molecular formula $\mathrm{C}_{6} \mathrm{H}_{7} \mathrm{~N}$. The structure of 'A' is :Correct Option: , 3 Solution:...
Read More →Elevation in the boiling point for 1 molal solution
Question: Elevation in the boiling point for 1 molal solution of glucose is $2 \mathrm{~K}$. The depression in the freezing point of 2 molal solutions of glucose in the same solvent is $2 \mathrm{~K}$. The relation between $\mathrm{K}_{\mathrm{b}}$ and $\mathrm{K}_{\mathrm{f}}$ is:$\mathrm{K}_{\mathrm{b}}=0.5 \mathrm{~K}_{\mathrm{f}}$$\mathrm{K}_{\mathrm{b}}=2 \mathrm{~K}_{\mathrm{f}}$$\mathrm{K}_{\mathrm{b}}=1.5 \mathrm{~K}_{\mathrm{f}}$$\mathrm{K}_{\mathrm{b}}=\mathrm{K}_{\mathrm{f}}$Correct O...
Read More →The correct sequence of amino acids present in the tripeptide given below is :
Question: The correct sequence of amino acids present in the tripeptide given below is : Leu - Ser - ThrThr - Ser- LeuThr - Ser - ValVal - Ser - ThrCorrect Option: , 4 Solution:...
Read More →The electrolytes usually used in the electroplating
Question: The electrolytes usually used in the electroplating of gold and silver, respectively, are :$\left[\mathrm{Au}(\mathrm{OH})_{4}\right]^{-}$and $\left[\mathrm{Ag}(\mathrm{OH})_{2}\right]^{-}$$\left[\mathrm{Au}(\mathrm{CN})_{2}\right]^{-}$and $[\mathrm{Ag} \mathrm{CI}]^{-}$$\left[\mathrm{Au}\left(\mathrm{NH}_{3}\right)_{2}\right]^{+}$and $\left[\mathrm{Ag}(\mathrm{CN})_{2}\right]^{-}$$\left[\mathrm{Au}(\mathrm{CN})_{2}\right]^{-}$and $\left[\mathrm{Ag}(\mathrm{CN})_{2}\right]^{-}$Correct ...
Read More →5.1g NH4SH is introduced in 3.0 L
Question: $5.1 \mathrm{~g} \mathrm{NH} \mathrm{NH}_{4} \mathrm{SH}$ is introduced in $3.0 \mathrm{~L}$ evacuated flask at $327^{\circ} \mathrm{C} .30 \%$ of the solid $\mathrm{NH}_{4} \mathrm{SH}$ decomposed to $\mathrm{NH}_{3}$ and $\mathrm{H}_{2} \mathrm{~S}$ as gases. The $\mathrm{K}_{\mathrm{p}}$ of the reaction at $327^{\circ} \mathrm{C}$ is $(\mathrm{R}=0.082 \mathrm{~L}$ atm $\mathrm{mol}^{-1} \mathrm{~K}^{-1}$, Molar mass of $\mathrm{S}=32 \mathrm{~g} \mathrm{~mol}^{01}$, molar mass of $...
Read More →Solve this following
Question: For the reaction, $2 \mathrm{~A}+\mathrm{B} \rightarrow$ products, when the concentrations of A and B both wrere doubled, the rate of the reaction increased from $0.3 \mathrm{~mol}$ $\mathrm{L}^{-1} \mathrm{~S}^{-1}$ to $2.4 \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$. When the concentration of $\mathrm{A}$ alone is doubled, the rate increased from $0.3 \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}$ to0.6 $\mathrm{mol} \mathrm{L}^{-1} \mathrm{~s}^{-1}$ Which one of the following...
Read More →In the reaction of oxalate with permaganate in acidic medium,
Question: In the reaction of oxalate with permaganate in acidic medium, the number of electrons involved in producing one molecule of $\mathrm{CO}_{2}$ is :10215Correct Option: , 3 Solution: $10 \mathrm{e}^{-}$trans for 10 molecules of $\mathrm{CO}_{2}$ so per molecule of $\mathrm{CO}_{2}$ transfer of $\mathrm{e}^{-}$is ' 1 '...
Read More →The major product formed in the following reaction is:
Question: The major product formed in the following reaction is: Correct Option: 1 Solution: Aldehyde reacts at a faster rate than keton during aldol and stericall less hindered anion will be a better nucleophile so sefl aldol at...
Read More →The correct match between item 'I' and item 'II' is :
Question: The correct match between item 'I' and item 'II' is : $(\mathrm{A}) \rightarrow(\mathrm{Q}),(\mathrm{B}) \rightarrow(\mathrm{P}),(\mathrm{C}) \rightarrow(\mathrm{S}),(\mathrm{D}) \rightarrow(\mathrm{R})$$(\mathrm{A}) \rightarrow(\mathrm{Q}),(\mathrm{B}) \rightarrow(\mathrm{R}),(\mathrm{C}) \rightarrow(\mathrm{S}),(\mathrm{D}) \rightarrow(\mathrm{P})$$(A) \rightarrow(Q),(B) \rightarrow(P),(C) \rightarrow(R),(D) \rightarrow(S)$$(\mathrm{A}) \rightarrow(\mathrm{R}),(\mathrm{B}) \rightarro...
Read More →Which is the most suitable reagent for
Question: Which is the most suitable reagent for the following transformation ? alkaline $\mathrm{KMnO}_{4}$$\mathrm{I}_{2} / \mathrm{NaOH}$Tollen's reagent$\mathrm{CrO}_{2} / \mathrm{CS}_{2}$Correct Option: , 2 Solution: $\mathrm{I}_{2} / \mathrm{NaOH}$...
Read More →What is the IUPAC name of
Question: What is the IUPAC name of the following compound? 3-Bromo-1, 2-dimethylbut-1-ene]4-Bromo-3-methylpent-2-ene2 -Bromo-3-methylpent-3-ene3-Bromo-3-methyl-1, 2-dimethylprop-1-eneCorrect Option: , 2 Solution: 4-Bromo-3-methylpent-2-ene...
Read More →The tests performed on compound $X$ and their inferences are:
Question: The tests performed on compound $X$ and their inferences are: Compound ' $\mathrm{X}$ ' is:Correct Option: , 2 Solution:...
Read More →Which of the following tests cannot
Question: Which of the following tests cannot be used for identifying amino acids ?Biuret testXanthoproteic testBarfoed testNinhydrin testCorrect Option: Solution: Barfoed test...
Read More →The major product obtained in the following reaction is :
Question: The major product obtained in the following reaction is : Correct Option: , 4 Solution:...
Read More →Which of the following combination of statements is true regarding the interpretation of the atomic orbitals?
Question: Which of the following combination of statements is true regarding the interpretation of the atomic orbitals? (a) An electron in an orbital of high angular momentum stays away from the nucleus than an electron in the orbital of lower angular momentum. (b) For a given value of the principal quantum number, the size of the orbit is inversely proportional to the azimuthal quantum number. (c) According to wave mechanics, the ground state angular momentum is $h$ equal to $\frac{\mathrm{h}}{...
Read More →A reaction of cobalt(III) chloride and ethylenediamine in
Question: A reaction of cobalt(III) chloride and ethylenediamine in a $1: 2$ mole ratio generates two isomeric products $A$ (violet coloured) B (green coloured). A can show optial actively, $B$ is optically inactive. What type of isomers does $\mathrm{A}$ and $\mathrm{B}$ represent ?Geometrical isomersIonisation isomers]Coordination isomersLinkage isomersCorrect Option: 1 Solution: Geometrical isomers...
Read More →The major product of the following reaction is:
Question: The major product of the following reaction is: Correct Option: , 3 Solution:...
Read More →The process with negative entropy change is :
Question: The process with negative entropy change is :Dissolution of iodine in waterSynthesis of ammonia from $\mathrm{N}_{2}$ and $\mathrm{H}_{2}$Dissolution of $\mathrm{CaSO}_{4}$ (s) to $\mathrm{CaO}(\mathrm{s})$ and $\mathrm{SO}_{3}(\mathrm{~g})$Subimation of dry iceCorrect Option: , 2 Solution: $\mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \rightleftharpoons 2 \mathrm{NH}_{3}(\mathrm{~g}) ; \Delta \mathrm{n}_{\mathrm{g}}0$...
Read More →The reaction that is NOT involved
Question: The reaction that is NOT involved in the ozone layer depletion mechanism is the stratosphere is:Correct Option: , 3 Solution:...
Read More →The transition element that has lowest enthalpy of atomisation, is :
Question: The transition element that has lowest enthalpy of atomisation, is :$\mathrm{Zn}$$\mathrm{Cu}$$\mathrm{V}$$\mathrm{Fc}$Correct Option: , 2 Solution: Since $\mathrm{Zn}$ is not a transition element so transition element having lowest atomisation energy out of $\mathrm{Cu}, \mathrm{V}, \mathrm{Fe}$ is $\mathrm{Cu}$....
Read More →A compound of formula
Question: A compound of formula $\mathrm{A}_{2} \mathrm{~B}_{3}$ has the hcp lattice. Which atom forms the hep lattice and what fraction of tetrahedral voids is occupied by the other atoms:hep lattice-A, $\frac{2}{3}$ Tetrachedral voids-Bhep lattice-B, $\frac{1}{3}$ Tetrachedral voids-Ahep lattice-B, $\frac{2}{3}$ Tetrachedral voids-Ahep lattice-A $\frac{1}{3}$ Tetrachedral voids-BCorrect Option: , 2 Solution:...
Read More →The major product of the following reaction is:
Question: The major product of the following reaction is: Correct Option: , 4 Solution:...
Read More →The difference in the number of unpaired electrons
Question: The difference in the number of unpaired electrons of a metal ion in its high-spin and low-spin octahedral complexes is two. The metal ion is :$\mathrm{Fe}^{2+}$$\mathrm{Co}^{2+}$$\mathrm{Mn}^{2+}$$\mathrm{Mn}^{2+}$Correct Option: 2, Solution: $\mathrm{Co}^{2+}$...
Read More →The major product of the following reaction is:
Question: The major product of the following reaction is: Correct Option: , 4 Solution:...
Read More →In which of the following processes, the bond order has increased and paramagnetic character has changed to diamagnetic ?
Question: In which of the following processes, the bond order has increased and paramagnetic character has changed to diamagnetic ?$\mathrm{N}_{2} \rightarrow \mathrm{N}_{2}^{+}$$\mathrm{NO} \rightarrow \mathrm{NO}^{+}$$\mathrm{O}_{2} \rightarrow \mathrm{O}_{2}^{2-}$$\mathrm{O}_{2} \rightarrow \mathrm{O}_{2}^{+}$Correct Option: , 2 Solution:...
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