Identify A in the following chemical reaction
Question: Identify $\mathrm{A}$ in the following chemical reaction Correct Option: , 3 Solution:...
Read More →Identify A in the given chemical reaction,
Question: Identify A in the given chemical reaction, Correct Option: , 3 Solution:...
Read More →The calculated magnetic moments (spin only value) for species
Question: The calculated magnetic moments (spin only value) for species $\left[\mathrm{FeCl}_{4}\right]^{2-},\left[\mathrm{Co}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]^{3-}$ and $\mathrm{MnO}_{4}^{2-}$ respectively are :$5.82,0$ and 0 BM$4.90,0$ and $1.73 \mathrm{BM}$5.92, 4.90 and 0 BM4.90, 0 and 2.83 BMCorrect Option: , 2 Solution: $\mu=\sqrt{n(n+2)} B M$ $=\sqrt{4(4+2)} \mathrm{BM}$ $=\sqrt{24} \mathrm{BM} \Rightarrow 4.90 \mathrm{BM}$ (ii) $\left[\mathrm{Co}\left(\mathrm{C}_{2} \...
Read More →If the real part of the complex number
Question: If the real part of the complex number $\mathrm{z}=\frac{3+2 i \cos \theta}{1-3 i \cos \theta}, \theta \in\left(0, \frac{\pi}{2}\right)$ is zero, then the value of $\sin ^{2} 3 \theta+\cos ^{2} \theta$ is equal to______________ Solution: $\operatorname{Re}(z)=\frac{3-6 \cos ^{2} \theta}{1+9 \cos ^{2} \theta}=0$ $\Rightarrow \theta=\frac{\pi}{4}$ Hence, $\sin ^{2} 3 \theta+\cos ^{2} \theta=1$...
Read More →Which pair of oxides is acidic in nature?
Question: Which pair of oxides is acidic in nature?$\mathrm{B}_{2} \mathrm{O}_{3}, \mathrm{CaO}$$\mathrm{B}_{2} \mathrm{O}_{3}, \mathrm{SiO}_{2}$$\mathrm{N}_{2} \mathrm{O}, \mathrm{BaO}$$\mathrm{CaO}, \mathrm{SiO}_{2}$Correct Option: , 2 Solution: $\left\{\begin{array}{l}\mathrm{CaO}, \mathrm{BaO}=\text { Basic Nature } \\ \mathrm{B}_{2} \mathrm{O}_{3}, \mathrm{SiO}_{2}=\text { Acidic Nature } \\ \mathrm{N}_{2} \mathrm{O}=\text { Neutral oxide }\end{array}\right.$...
Read More →Ceric ammonium nitrate and CHCL3/alc.
Question: Ceric ammonium nitrate and $\mathrm{CHCl}_{3} /$ alc. $\mathrm{KOH}$ are used for the identification of functional groups present in________ and _________ respectively.Alcohol, phenolAmine, alcoholAlcohol, amineAmine, phenolCorrect Option: , 3 Solution: Ceric ammonium nitrate for alcohol and $\mathrm{CHCl}_{3} /$ $\mathrm{KOH}$ is carbyl amine test for primary amines...
Read More →Solve this following
Question: The distance of the point $\mathrm{P}(3,4,4)$ from the point of intersection of the line joining the points. $\mathrm{Q}(3,-4,-5)$ and $\mathrm{R}(2,-3,1)$ and the plane $2 x+y+z=7$, is equal to Solution: $\overrightarrow{\mathrm{QR}}:-\frac{\mathrm{x}-3}{1}=\frac{\mathrm{y}+4}{-1}=\frac{\mathrm{z}+5}{-6}=\mathrm{r}$ $\Rightarrow(x, y, z) \equiv(r+3,-r-4,-6 r-5)$ Now, satisfying it in the given plane. We get $r=-2$. so, required point of intersection is $\mathrm{T}(1,-2,7)$. Hence, $\m...
Read More →Match list - I and List - II.
Question: Match list - I and List - II. Choose the correct answer from the options given below :(a)-(ii), (b)-(i), (c)-(iv), (d)-(iii)(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)(a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)Correct Option: , 3 Solution: Match list-I \ list-II Rosenmund Reduction Clemmenson reduction...
Read More →2,4 -DNP test can be used to identify :
Question: 2,4 -DNP test can be used to identify :AmineAldehydeEtherHalogensCorrect Option: , 2 Solution: 2,4 -DNP test is useful for the identification of carbonyl compounds....
Read More →Solve this following
Question: Let $\quad \overrightarrow{\mathrm{a}}=\hat{\mathrm{i}}-\alpha \hat{\mathrm{j}}+\beta \hat{\mathrm{k}}, \quad \overrightarrow{\mathrm{b}}=3 \hat{\mathrm{i}}+\beta \hat{\mathrm{j}}-\alpha \hat{\mathrm{k}} \quad$ and $\overrightarrow{\mathrm{c}}=-\alpha \hat{\mathrm{i}}-2 \hat{\mathrm{j}}+\hat{\mathrm{k}}$, where $\alpha$ and $\beta$ are integers. If $\overrightarrow{\mathrm{a}} \cdot \overrightarrow{\mathrm{b}}=-1$ and $\overrightarrow{\mathrm{b}} \cdot \overrightarrow{\mathrm{c}}=10$, ...
Read More →Seliwanoff test and Xanthoproteic test are used for
Question: Seliwanoff test and Xanthoproteic test are used for the identification of_______ and_______ respectivelyAldoses, ketosesProteins, ketosesKetoses, proteinsKetoses, aldosesCorrect Option: , 3 Solution: Seliwanoff test for ketose and Xenthoprotic test for proteins....
Read More →According to Bohr's atomic theory :-
Question: According to Bohr's atomic theory :- (A) Kinetic energy of electron is $\propto \frac{Z^{2}}{n^{2}}$. (B) The product of velocity (v) of electron and principal quantum number $(\mathrm{n})$, 'vn' $\propto Z^{2}$ (C) Frequency of revolution of electron in an orbit is $\propto \frac{Z^{3}}{n^{3}}$. (D) Coulombic force of attraction on the electron is $\propto \frac{Z^{3}}{n^{4}}$. Choose the most appropriate answer from the options given below :(C) Only(A) Only(A), (C) and (D) only(A) an...
Read More →In 1CH2 = 2C = 3CH - 4CH3 molecule,
Question: hybridization of carbon $1,2,3$ and 4 respectively are :$\mathrm{sp}^{3}, \mathrm{sp}, \mathrm{sp}^{3}, \mathrm{sp}^{3}$$\mathrm{sp}^{2}, \mathrm{sp}^{2}, \mathrm{sp}^{2}, \mathrm{sp}^{3}$$\mathrm{sp}^{2}, \mathrm{sp}, \mathrm{sp}^{2}, \mathrm{sp}^{3}$$\mathrm{sp}^{2}, \mathrm{sp}^{3}, \mathrm{sp}^{2}, \mathrm{sp}^{3}$Correct Option: , 3 Solution: $\left[\stackrel{1}{\mathrm{C}} \mathrm{H}_{2}=\stackrel{2}{\mathrm{C}}=\stackrel{3}{\mathrm{C}} \mathrm{H}-\stackrel{4}{\mathrm{C}} \mathrm...
Read More →The correct order of electron gain enthalpy is
Question: The correct order of electron gain enthalpy is$\mathrm{S}\mathrm{Se}\mathrm{Te}\mathrm{O}$$\mathrm{Te}\mathrm{Se}\mathrm{S}\mathrm{O}$$\mathrm{O}\mathrm{S}\mathrm{Se}\mathrm{Te}$$\mathrm{S}\mathrm{O}\mathrm{Se}\mathrm{Te}$Correct Option: 1 Solution: correct order of electron gain enthalpy is :- $\mathrm{O}\mathrm{S}\mathrm{Se}\mathrm{Te}$ $\Rightarrow \mathrm{S}\mathrm{Se}\mathrm{Te}\mathrm{O}$ (Oxygen shows least electron gain enthalpy due to small size of atom)...
Read More →The unit cell of copper corresponds
Question: The unit cell of copper corresponds to a face centered cube of edge length $3.596 A$ with one copper atom at each lattice point. The calculated density of copper in $\mathrm{kg} / \mathrm{m}^{3}$ is - [Molar mass of $\mathrm{Cu}: 63.54 \mathrm{~g}$; Avogadro Number $=6.022$ $\left.\times 10^{23}\right]$ Solution: $\mathrm{FCC}$, $\mathrm{d}=\frac{\mathrm{Z} \times \mathrm{M}}{\mathrm{N}_{\mathrm{A}} \times \mathrm{a}^{3}}=\frac{4 \times 63.54}{1000 \times 6.022 \times 10^{23} \times\le...
Read More →Copper reduces
Question: Copper reduces $\mathrm{NO}_{3}^{-}$into $\mathrm{NO}$ and $\mathrm{NO}_{2}$ depending upon the concentration of $\mathrm{HNO}_{3}$ in solution. (Assuming fixed $\left[\mathrm{Cu}^{2+}\right]$ and $\mathrm{P}_{\mathrm{NO}}=\mathrm{P}_{\mathrm{NO}_{2}}$ ), the $\mathrm{HNO}_{3}$ concentration at which the thermodynamic tendency for reduction of $\mathrm{NO}_{3}^{-}$into $\mathrm{NO}$ and $\mathrm{NO}_{2}$ by copper is same is $10^{x} \mathrm{M}$. The value of $2 x$ is_________________(R...
Read More →Five moles of an ideal gas
Question: Five moles of an ideal gas at $293 \mathrm{~K}$ is expanded isothermally from an initial pressure of $2.1 \mathrm{MPa}$ to $1.3 \mathrm{MPa}$ against at constant external pressure 4.3 MPa. The heat transferred in this process is_______________ $\mathrm{kJ} \mathrm{mol}^{-1}$. (Rounded-off to the nearest integer) [Use $\mathrm{R}=8.314 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}$ ] Solution: $\mathrm{n}=5, \mathrm{~T}=293 \mathrm{~K}=\mathrm{const}, \Delta \mathrm{U}=0$ $\mathrm{P}_...
Read More →Consider titration of NaOH solution
Question: Consider titration of $\mathrm{NaOH}$ solution versus $1.25 \mathrm{M}$ oxalic acid solution. At the end point following burette readings were obtained. (i) $4.5 \mathrm{~mL}$ (ii) $4.5 \mathrm{~mL}$ (iii) $4.4 \mathrm{~mL}$ (iv) $4.4 \mathrm{~mL}$ (v) $4.4 \mathrm{~mL}$ If the volume of oxalic acid taken was $10.0 \mathrm{~mL}$ then the molarity of the $\mathrm{NaOH}$ solution is________ M. (Rounded-off to the nearest integer) Solution: $\mathrm{V}_{\mathrm{NaOH}}=4.4 \mathrm{ml}$ eq....
Read More →Electromagnetic radiation of wavelength
Question: Electromagnetic radiation of wavelength 663 $\mathrm{nm}$ is just sufficient to ionise the atom of metal A. The ionization energy of metal $\mathrm{A}$ in $\mathrm{kJ} \mathrm{mol}^{-1}$ is__________ (Rounded-off to the nearest integer) ${\left[\mathrm{h}=6.63 \times 10^{-34} \mathrm{Js}, \mathrm{c}=3.00 \times 10^{8} \mathrm{~ms}^{-1}\right.}$ $\left.\mathrm{N}_{\mathrm{A}}=6.02 \times 10^{23} \mathrm{~mol}^{-1}\right]$ Solution: $\mathrm{E}=\frac{\mathrm{hc}}{\lambda} \times \frac{\m...
Read More →The spin only magnetic
Question: The spin only magnetic moment of a divalent ion in aqueous solution (atomic number 29) is__________ BM. Solution: $\mathrm{Z}=29(\mathrm{Cu})$ $\mathrm{Cu}^{2+}$ form $\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\right]^{2+}$ complex ion with $\mathrm{H}_{2} \mathrm{O}$.$\left[\mathrm{Cu}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4}\right]^{2+} \Rightarrow \mathrm{Cu}^{2+}[\mathrm{Ar}] 3 \mathrm{~d}^{9}, \mathrm{H}_{2} \mathrm{O} \rightarrow$ WFL number of unpaired $\mathrm...
Read More →The correct order of the following compounds showing increasing tendency towards nucleophilic substitution reaction is :-
Question: The correct order of the following compounds showing increasing tendency towards nucleophilic substitution reaction is :- (iv) $$ (iii) $$ (ii) $$ (i)$(\mathrm{iv})(\mathrm{i})(\mathrm{ii})(\mathrm{iii})$(iv) $$ (i) $$ (iii) $$ (ii)$(\mathrm{i})(\mathrm{ii})(\mathrm{iii})(\mathrm{iv})$Correct Option: , 4 Solution: For nucleophile substitution in aromatic halides Correct order is : (i) $$ (ii) $$ (iii) $$ (iv) More $\mathrm{No}$. of $\mathrm{NO}_{2}$ substituted aromatic halide, increas...
Read More →Among the following,
Question: Among the following, number of metal/s which can be used as electrodes in the photoelectric cell is_____________ (Integer answer)LiNaRbCsCorrect Option: 1 Solution: Cs is used as electrodes in the photoelectric cell....
Read More →A. Phenyl methanamine B. N,N-Dimethylaniline
Question: A. Phenyl methanamine B. N,N-Dimethylaniline C. N-Methyl aniline D. Benzenamine Choose the correct order of basic nature of the above amines.$\mathrm{A}\mathrm{C}\mathrm{B}\mathrm{D}$$\mathrm{D}\mathrm{C}\mathrm{B}\mathrm{A}$$\mathrm{D}\mathrm{B}\mathrm{C}\mathrm{A}$$\mathrm{A}\mathrm{B}\mathrm{C}\mathrm{D}$Correct Option: , 4 Solution: B.S. order $(A)(B)(C)(D)$...
Read More →The rate constant of a reaction
Question: The rate constant of a reaction increases by five times on increase in temperature from $27^{\circ} \mathrm{C}$ to $52^{\circ} \mathrm{C}$. The value of activation energy in $\mathrm{kJ} \mathrm{mol}^{-1}$ is_________ (Rounded-off to the nearest integer) $\left[\mathrm{R}=8.314 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1}\right]$ Solution: $\mathrm{T}_{1}=300 \mathrm{~K}, \mathrm{~T}_{2}=325 \mathrm{~K}, \mathrm{~K}_{2}=5 \mathrm{~K}$ $\ln \frac{\mathrm{K}_{2}}{\mathrm{~K}_{1}}=\fra...
Read More →Match List-I with List-II
Question: Match List-I with List-II Choose the correct answer from the options given below : Options :(a) $\rightarrow$ (i), (b) $\rightarrow$ (iii), (c) $\rightarrow$ (ii)(a) $\rightarrow$ (iii), (b) $\rightarrow$ (i), (c) $\rightarrow$ (iii)(a) $\rightarrow$ (ii), (b) $\rightarrow$ (i), (c) $\rightarrow$ (iii)(a) $\rightarrow$ (iii), (b) $\rightarrow$ (ii), (c) $\rightarrow$ (i)Correct Option: , 3 Solution: (1) Sucrose $\rightarrow \alpha-\mathrm{D}-\mathrm{Glucose}$ and $\beta-\mathrm{D}$-Fru...
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