The IUPAC name of the following compound is :
Question: The IUPAC name of the following compound is : 4-Bromo-2-methylcyclopentane carboxylic acid5-Bromo-3-methylcyclopentanoic acid3-Bromo-5-methylcyclopentane carboxylic acid3-Bromo-5-methylcyclopentanoic acidCorrect Option: 1 Solution: 4-bromo-2-methyl cyclopentane carboxylic Acid...
Read More →The decreasing order of reactivity of the following compounds towards nucleophilic
Question: The decreasing order of reactivity of the following compounds towards nucleophilic substitution $\left(\mathrm{S}_{\mathrm{N}}^{2}\right)$ is : $(\mathrm{IV})(\mathrm{II})(\mathrm{III})(\mathrm{I})$(II) $$ (III) $$ (IV) $$ (I)(II) $$ (III) $$ (I) $$ (IV)(III) $$ (II) $$ (IV) $$ (I)Correct Option: , 2 Solution:...
Read More →Prove the following
Question: Identify the incorrect statement from the options below for the above cell:If $\mathrm{E}_{\mathrm{ext}}1.1 \mathrm{~V}, \mathrm{Zn}$ dissolves at $\mathrm{Zn}$ electrode and $\mathrm{Cu}$ deposits at $\mathrm{Cu}$ electrodeIf $\mathrm{E}_{\text {ext }}1.1 \mathrm{~V}, \mathrm{e}^{-}$flows from $\mathrm{Cu}$ to $\mathrm{Zn}$If $\mathrm{E}_{e x t}=1.1 \mathrm{~V}$, no flow of $\mathrm{e}^{-}$or current occursIf $\mathrm{E}_{\mathrm{ext}}1.1 \mathrm{~V}, \mathrm{Zn}$ dissolves at anode a...
Read More →An ionic micelle is formed on the addition of :
Question: An ionic micelle is formed on the addition of : liquid diethyl ether to aqueous $\mathrm{NaCl}$ solutionsodium stearate to pure tolueneCorrect Option: , 2 Solution: Correct Ans. is (2)...
Read More →Among statements (a) -(d), the correct ones are :
Question: Among statements (a) $-(d)$, the correct ones are : (a) Lime stone is decomposed to $\mathrm{CaO}$ during the extraction of iron from its oxides. (b) In the extraction of silver, silver is extracted as an anionic complex. (c) Nickel is purified by Mond's process. (d) Zr and Ti are purified by Van Arkel method.(c) and (d) only(a), (c) and (d) only(b), (c) and (d) only(a), (b), (c) and (d)Correct Option: , 4 Solution: (a) $\mathrm{CaCO}_{3} \stackrel{\Delta}{\longrightarrow} \mathrm{CaO}...
Read More →The d-electron configuration of
Question: The d-electron configuration of $\left[\mathrm{Ru}(\mathrm{en})_{3}\right] \mathrm{Cl}_{2}$ and $\left[\mathrm{Fe}\left(\mathrm{H}_{2} \mathrm{O}\right)_{6}\right] \mathrm{Cl}_{2}$, respectively are :$\mathrm{t}_{2 \mathrm{~g}}^{4} \mathrm{e}_{\mathrm{g}}^{2}$ and $\mathrm{t}_{2 \mathrm{~g}}^{6} \mathrm{e}_{\mathrm{g}}^{0}$$\mathrm{t}_{2 \mathrm{~g}}^{6} \mathrm{e}_{\mathrm{g}}^{0}$ and $\mathrm{t}_{2 \mathrm{~g}}^{6} \mathrm{e}_{\mathrm{g}}^{0}$$\mathrm{t}_{2 \mathrm{~g}}^{6} \mathrm{...
Read More →When neopentyl alcohol is heated with an acid,
Question: When neopentyl alcohol is heated with an acid, it slowly converted into an $85: 15$ mixture of alkenes $\mathrm{A}$ and $\mathrm{B}$, respectively. What are these alkenes?Correct Option: , 4 Solution:...
Read More →Which of the following will react with
Question: Which of the following will react with $\mathrm{CHCl}_{3}+$ alc. $\mathrm{KOH}$ ?Adenine and lysineAdenine and thymineAdenine and prolineThymine and prolineCorrect Option: 1 Solution: Adenine and lysine Both have primary amine react with $\mathrm{CHCl}_{3}+$ alc. $\mathrm{KOH}$...
Read More →A mixture of one mole each of
Question: A mixture of one mole each of $\mathrm{H}_{2}, \mathrm{He}$ and $\mathrm{O}_{2}$ each are enclosed in a cylinder of volume $V$ at temperature $\mathrm{T}$. If the partial pressure of $\mathrm{H}_{2}$ is $2 \mathrm{~atm}$, the total pressure of the gases in the cylinder is : $14 \mathrm{~atm}$$22 \mathrm{~atm}$$6 \mathrm{~atm}$38 atmCorrect Option: , 3 Solution: According to Dalton's law of partial pressure $\mathrm{p}_{\mathrm{i}}=\mathrm{x}_{\mathrm{i}} \times \mathrm{P}_{\mathrm{T}}$...
Read More →On heating, lead(II) nitrate gives a brown gas (A).
Question: On heating, lead(II) nitrate gives a brown gas (A). The gas (A) on cooling changes to a colourless solid/liquid (B). (B) on heating with $\mathrm{NO}$ changes to a blue solid $(\mathrm{C})$. The oxidation number of nitrogen in solid (C) is :$+5$$+2$$+4$+3Correct Option: , 4 Solution: O.S. of nitrogen in $\mathrm{N}_{2} \mathrm{O}_{3}$ is $+3$ $\mathrm{N}_{2} \mathrm{O}_{3} 2 \mathrm{x}+3(-2)=0$ $x=+3$...
Read More →The five successive ionization enthalpies of an
Question: The five successive ionization enthalpies of an element are $800,2427,3658,25024$ and 32824 $\mathrm{kJ} \mathrm{mol}^{-1}$. The number of valence electrons in the element is : 2345Correct Option: , 2 Solution: Let suppose element $X \Rightarrow$ $\mathrm{X}^{+3}$ has stable inert gas configuration as there is high jump after $\mathrm{IE}_{3}$ So valence electrons are 3...
Read More →The incorrect statement(s) among (a) - (d) regarding acid rain is (are) :
Question: The incorrect statement(s) among (a) - (d) regarding acid rain is (are) : (a) It can corrode water pipes. (b) It can damage structures made up of stone. (c) It cannot cause respiratory ailments in animals. (d) It is not harmful for trees (c) and (d)(a), (b) and (d)(c) only(a), (c) and (d)Correct Option: , 2 Solution: (1) Acid rain corrodes water pipes resulting in the leaching of heavy of heavy metals such as iron, lead and copper into the drinking water. (2) Acid rain damages building...
Read More →Solve this following
Question: $100 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{HCl}$ is taken in a beaker and to it $100 \mathrm{~mL}$ of $0.1 \mathrm{M} \mathrm{NaOH}$ is added in steps of $2 \mathrm{~mL}$ and the $\mathrm{pH}$ is continuously measured. Which of the following graphs correctly depicts the change in $\mathrm{pH}$ ?Correct Option: , 3 Solution: Steep rise in $\mathrm{pH}$ around the equivalence point for titration of strong acid with strong base....
Read More →Three isomers A, B and C (mol. formula
Question: Three isomers A, B and C (mol. formula $\mathrm{C}_{8} \mathrm{H}_{11} \mathrm{~N}$ ) give the following results : $\mathrm{R}$ has lower boiling point than $\mathrm{S}$ B $\mathrm{C}_{6} \mathrm{H}_{5} \mathrm{SO}_{2} \mathrm{Cl} \rightarrow$ alkali-insoluble product $\mathrm{A}, \mathrm{B}$ and $\mathrm{C}$, respectively are : Correct Option: , 2 Solution:...
Read More →The work function of sodium metal is
Question: The work function of sodium metal is $4.41 \times 10^{-19} \mathrm{~J}$. If the photons of wavelength $300 \mathrm{~nm}$ are incident on the metal, the kinetic energy of the ejected electrons will be $\left(\mathrm{h}=6.63 \times 10^{-34} \mathrm{Js} ; \mathrm{c}=3 \times 10^{8} \mathrm{~m} / \mathrm{s}\right)$ ______$\times 10^{-21} \mathrm{~J}$. Solution: $E=W+K \cdot E_{\max }$ $\mathrm{K} \cdot \mathrm{E}_{\max }=\mathrm{E}-\mathrm{W}$ $=\frac{\mathrm{hc}}{\lambda}-4.41 \times 10^{...
Read More →The ratio of the mass percentages of
Question: The ratio of the mass percentages of ' $\mathrm{C} \ \mathrm{H}^{\prime}$ and ' $\mathrm{C} \ \mathrm{O}^{\prime}$ of a saturated acyclic organic compound ' $\mathrm{X}$ ' are $4: 1$ and $3: 4$ respectively. Then, the moles of oxygen gas required for complete combustion of two moles of organic compound ' $X$ ' is Solution: $\mathrm{C}: \mathrm{H}=4: 1$ $\mathrm{C}: \mathrm{O}=3: 4$ Mass ratio $\mathrm{C}: \mathrm{H}: \mathrm{O}=12: 3: 16$ Mole ratio $\mathrm{C}: \mathrm{H}: \mathrm{O}=...
Read More →The oxidation states of transition metal atoms in
Question: The oxidation states of transition metal atoms in $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$, $\mathrm{KMnO}_{4}$ and $\mathrm{K}_{2}\mathrm{FeO}_{4}$, respectively, are $x, y$ and $z$. The sum of $x, y$ and $z$ is_________. Solution: $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ $2(+1)+2 x+7(-2)=0$ $x=+6$ In $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$, Transition metal (Cr) present in $+6$ oxidation state. $\mathrm{KMnO}_{4}$ $(+1)+y+4(-2)=0$ $x=+7$ In $\mathrm{KMnO}_{4}$, ...
Read More →Consider the hypothetical situation where the azimuthal quantum number
Question: Consider the hypothetical situation where the azimuthal quantum number, $l$, takes values 0 , $1,2, \ldots \ldots \mathrm{n}+1$, where $\mathrm{n}$ is the principal quantum number. Then, the element with atomic number : 13 has a half-filled valence subshell9 is the first alkali metal8 is the first noble gas6 has a $2 \mathrm{p}$-valence subshellCorrect Option: 1 Solution: $l=0$ to $(\mathrm{n}+1)$ $\mathrm{n}=1$ $\mathrm{n}=2$ $l=0,1,2$ $l=0,1,2,3$ $(\mathrm{n}+l) \Rightarrow \frac{1 \...
Read More →For the disproportionation reaction
Question: For the disproportionation reaction $2 \mathrm{Cu}^{+}(\mathrm{aq}) \rightleftharpoons \mathrm{Cu}(\mathrm{s})+\mathrm{Cu}^{2+}(\mathrm{aq})$ at $298 \mathrm{~K}$, $\ln K$ (where $K$ is the equilibrium constant) is ________$\times 10^{-1}$. Given $\left(\mathrm{E}_{\mathrm{Cu}^{2+} / \mathrm{Cu}^{+}}^{0}=0.16 \mathrm{~V}\right.$ $\mathrm{E}_{\mathrm{Cu}^{+} / \mathrm{Cu}}^{0}=0.52 \mathrm{~V}$ $\left.\frac{\mathrm{RT}}{\mathrm{F}}=0.025\right)$ Solution: $\mathrm{E}_{\mathrm{cell}}^{0}...
Read More →The strengths of 5.6 volume hydrogen peroxide
Question: The strengths of $5.6$ volume hydrogen peroxide (of density $1 \mathrm{~g} / \mathrm{mL}$ ) in terms of mass percentage and molarity (M), respectively, are: (Take molar mass of hydrogen peroxide as $34 \mathrm{~g} / \mathrm{mol}$ )$1.7$ and $0.25$$1.7$ and $0.5$$0.85$ and $0.5$$0.85$ and $0.25$Correct Option: , 2 Solution: Volume strength $=11.2 \times$ molarity $\Rightarrow$ molarity $=\frac{5.6}{11.2}=0.5$ Assuming 1 litre solution; mass of solution $=1000 \mathrm{ml} \times 1 \mathr...
Read More →The heat of combustion of ethanol into carbon dioxides
Question: The heat of combustion of ethanol into carbon dioxides and water is $-327 \mathrm{kcal}$ at constant pressure. The heat evolved (in cal) at constant volume and $27^{\circ} \mathrm{C}$ (if all gases behave ideally) is $\left(R=2 \mathrm{cal} \mathrm{mol}^{-1} \mathrm{~K}^{-1}\right)$ Solution: $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}_{(\ell)}+3 \mathrm{O}_{2(\mathrm{~g})} \longrightarrow 2 \mathrm{CO}_{2(\mathrm{~g})}+3 \mathrm{H}_{2} \mathrm{O}_{(\ell)}$ $\Delta \mathrm{n}_{g}=2-3=-1...
Read More →The molecular geometry of SF6 is octahedral.
Question: The molecular geometry of $\mathrm{SF}_{6}$ is octahedral. What is the geometry of $\mathrm{SF}_{4}$ (including lone pair(s) of electrons, if any) ?Trigonal bipyramidalSquare planarTetrahedralPyramidalCorrect Option: 1 Solution: $4 \sigma$ bonds $+1$ lone pair $\therefore$ Shape (including lone pair of electrons) is Trigonal bipyramidal...
Read More →Among the statements
Question: Among the statements $(\mathrm{I}-\mathrm{IV})$, the correct ones are: (I) Be has smaller atomic radius compared to Mg. (II) Be has higher ionization enthalpy than $\mathrm{Al}$. (III) Charge/radius ratio of Be is greater than that of $\mathrm{Al}$. (IV) Both Be and Al form mainly covalent compounds. (I), (II) and (IV)(II), (III) and (IV)(I), (II) and (III)(I), (III) and (IVCorrect Option: , 3 Solution: $\mathrm{I}, \mathrm{A}_{\mathrm{N}}: \mathrm{Be}\mathrm{Mg}$ II IE : Be Al III Cha...
Read More →The correct observation in the following reactions is :
Question: The correct observation in the following reactions is : Formation of blue colourFormation of violet colourFormation of red colourGives no colourCorrect Option: , 3 Solution: Seliwanoff's test is used to distinguish between aldose and ketone sugars; when added to a solution containing ketose, red colour is formed rapidly....
Read More →Match the type of interaction in Column A with
Question: Match the type of interaction in Column A with the distance dependence of their interaction energy in Column B : (I)-(a), (II)-(b), (III)-(c)(I)-(a), (II)-(c), (III)-(d)(I)-(a), (II)-(b), (III)-(d)(I)-(b), (II)-(d), (III)-(c)Correct Option: , 3 Solution:...
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