Metallic sodium does not react
Question: Metallic sodium does not react normally with :gaseous ammoniaBut-2-yneEthynetert-butyl alcoholCorrect Option: , 2 Solution: Metallic sodium does not react with 2-butyne because 2-butyne does not have acidic hydrogen....
Read More →In the electrolytic refining of blister copper, the total number of main impurities, from the following,
Question: In the electrolytic refining of blister copper, the total number of main impurities, from the following, removed as anode mud is $\mathrm{Pb}, \mathrm{Sb}, \mathrm{Se}, \mathrm{Te}, \mathrm{Ru}, \mathrm{Ag}$, Au and $\mathrm{Pt}$ Solution: Anode mud contains Sb, Se, Te, Ag, Au and Pt...
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Question: The empirical formula for a compound with a cubic close packed arrangement of anions and with cations occupying all the octahedral sites in $\mathrm{A}_{\mathrm{x}} \mathrm{B}$. The value of $\mathrm{x}$ is (Integer answer) Solution: Anions froms $\mathrm{CCP}$ or $\mathrm{FCC}\left(\mathrm{A}^{-}\right)=4 \mathrm{~A}^{-}$per unit cell Cations occupy all octahedral voids $\left(\mathrm{B}^{+}\right)=4 \mathrm{~B}^{+}$per unit cell cell formula $\rightarrow \mathrm{A}_{4} \mathrm{~B}_{4...
Read More →The resistance of a conductivity cell
Question: The resistance of a conductivity cell with cell constant $1.14 \mathrm{~cm}^{-1}$, containing $0.001 \mathrm{M} \mathrm{KCl}$ at $298 \mathrm{~K}$ is $1500 \Omega$. The molar conductivity of $0.001 \mathrm{M} \mathrm{KCl}$ solution at $298 \mathrm{~K}$ in $\mathrm{S} \mathrm{cm}^{2} \mathrm{~mol}^{-1}$ is___________ (Integer answer) Solution: $\mathrm{K}=\frac{1}{\mathrm{R}} \times y / \mathrm{A}=\left(\left(\frac{1}{1500}\right) \times 1.14\right) \mathrm{S} \mathrm{cm}^{-1}$ $\Righta...
Read More →Outermost electronic configuration of a group 13 element,
Question: Outermost electronic configuration of a group 13 element, $E$, is $4 \mathrm{~s}^{2}, 4 \mathrm{p}^{1}$. The electronic configuration of an element of p-block period-five placed diagonally to element, $\mathrm{E}$ is :[Kr] $3 \mathrm{~d}^{10} 4 \mathrm{~s}^{2} 4 \mathrm{p}^{2}$$[\mathrm{Ar}] 3 \mathrm{~d}^{10} 4 \mathrm{~s}^{2} 4 \mathrm{p}^{2}$$[\mathrm{Xe}] 5 \mathrm{~d}^{10} 6 \mathrm{~s}^{2} 6 \mathrm{p}^{2}$$[\mathrm{Kr}] 4 \mathrm{~d}^{10} 5 \mathrm{~s}^{2} 5 \mathrm{p}^{2}$Corre...
Read More →The value of magnetic quantum number of the outermost electron of
Question: The value of magnetic quantum number of the outermost electron of $\mathrm{Zn}^{+}$ion is Solution: $\mathrm{Zn}^{+} \rightarrow 1 \mathrm{~s}^{2} 2 \mathrm{~s}^{2} 2 \mathrm{p}^{6} 3 \mathrm{~s}^{2} 3 \mathrm{p}^{6} 3 \mathrm{~d}^{10} 4 \mathrm{~s}^{1}$ Outermost electron is in $4 \mathrm{~s}$ subshell $\mathrm{m}=0$...
Read More →40 g of glucose (Molar mass = 180) is mixed with 200 mL of water. The freezing point of solution is _____ K. (Nearest integer)
Question: 40 g of glucose (Molar mass = 180) is mixed with 200 mL of water. The freezing point of solution is _____ K. (Nearest integer) $\left[\right.$ Given $: \mathrm{K}_{\mathrm{r}}=1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1} ;$ Density of water $=$ $1.00 \mathrm{~g} \mathrm{~cm}^{-3}$; Freezing point of water $\left.=273.15 \mathrm{~K}\right]$ Solution: molality $=\frac{\left(\frac{40}{180}\right) \mathrm{mol}}{0.2 \mathrm{Kg}}=\left(\frac{10}{9}\right)$ molal $\Rightarrow \Delta \math...
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Question: $1.22 \mathrm{~g}$ of an organic acid is separately dissolved in $100 \mathrm{~g}$ of benzene $\left(\mathrm{K}_{\mathrm{b}}=2.6 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}\right)$ and $100 \mathrm{~g}$ of acetone $\left(\mathrm{K}_{\mathrm{b}}=1.7 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}\right)$. The acid is known to dimerize in benzene but remain as a monomer in acetone. The boiling point of the solution in acetone increases by $0.17^{\circ} \mathrm{C}$. The increase in boiling po...
Read More →100 g of propane is completely reacted with 1000 g of oxygen.
Question: $100 \mathrm{~g}$ of propane is completely reacted with $1000 \mathrm{~g}$ of oxygen. The mole fraction of carbon dioxide in the resulting mixture is $x \times 10^{-2}$. The value of $x$ is__________ (Nearest integer) [Atomic weight : $\mathrm{H}=1.008 ; \mathrm{C}=12.00 ; \mathrm{O}=16.00]$ Solution: $\mathrm{C}_{3} \mathrm{H}_{8(\mathrm{~g})}+5 \mathrm{O}_{2(\mathrm{~g})} \longrightarrow 3 \mathrm{CO}_{2(\mathrm{~g})}+4 \mathrm{H}_{2} \mathrm{O}_{(\ell)}$ $\mathrm{t}=0 \quad 2.27$ mo...
Read More →A solution is 0.1 M in
Question: A solution is $0.1 \mathrm{M}$ in $\mathrm{Cl}^{-}$and $0.001 \mathrm{M}$ in $\mathrm{CrO}_{4}^{2-}$. Solid $\mathrm{AgNO}_{3}$ is gradually added to it Assuming that the addition does not change in volume and $\mathrm{K}_{\mathrm{sp}}(\mathrm{AgCl})=1.7 \times 10^{-10} \mathrm{M}^{2}$ and $\mathrm{K}_{\mathrm{sp}}\left(\mathrm{Ag}_{2} \mathrm{CrO}_{4}\right)=1.9 \times 10^{-12} \mathrm{M}^{3}$ Select correct statement from the following : $\mathrm{AgCl}$ precipitates first because its...
Read More →Two flasks I and II shown below are connected by a valve of negligible volume.
Question: Two flasks I and II shown below are connected by a valve of negligible volume. When the valve is opened, the final pressure of the system in bar is $x \times 10^{-2}$. The value of $x$ is__________ (Integer answer) [Assume-Ideal gas; 1 bar $=10^{5} \mathrm{~Pa}$; Molar mass of $\left.\mathrm{N}_{2}=28.0 \mathrm{~g} \mathrm{~mol}^{-1} ; \mathrm{R}=8.31 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}\right]$ Solution: $\Rightarrow\left(\begin{array}{c}\text { Heat lost by } \\ \mathrm{N}...
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Question: $\mathrm{CH}_{4}$ is adsorbed on $1 \mathrm{~g}$ charcoal at $0^{\circ} \mathrm{C}$ following the Freundlich adsorption isotherm. $10.0 \mathrm{~mL}$ of $\mathrm{CH}_{4}$ is adsorbed at $100 \mathrm{~mm}$ of $\mathrm{Hg}$, whereas $15.0$ $\mathrm{mL}$ is adsorbed at $200 \mathrm{~mm}$ of $\mathrm{Hg}$. The volume of $\mathrm{CH}_{4}$ adsorbed at $300 \mathrm{~mm}$ of $\mathrm{Hg}$ is $10^{x} \mathrm{~mL}$. The value of $\mathrm{x}$ is $\times 10^{-2}$. (Nearest integer) $\left[\right.$...
Read More →Consider two chemical reactions (A) and (B) that take
Question: Consider two chemical reactions (A) and (B) that take place during metallurgical process : (A) $\mathrm{ZnCO}_{3(\mathrm{~s})} \stackrel{\Delta}{\longrightarrow} \mathrm{ZnO}_{(\mathrm{s})}+\mathrm{CO}_{2(\mathrm{~g})}$ (B) $2 \mathrm{ZnS}_{(\mathrm{s})}+3 \mathrm{O}_{2(\mathrm{~g})} \stackrel{\Delta}{\longrightarrow} 2 \mathrm{ZnO}_{(\mathrm{s})}+2 \mathrm{SO}_{2(\mathrm{~g})}$(A) is calcination and (B) is roastingBoth (A) and (B) are producing same product so both are roastingBoth (A...
Read More →The number of optical isomers possible for
Question: The number of optical isomers possible for $\left[\mathrm{Cr}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]^{3-}$ is Solution: The number of optical isomers for $\left[\mathrm{Cr}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]^{3-}$ is two....
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Question: The number of $\mathrm{S}=\mathrm{O}$ bonds present in sulphurous acid, peroxodisulphuric acid and pyrosulphuric acid, respectively are : 2,3 and 41,4 and 32,4 and 31,4 and 4Correct Option: , 4 Solution:...
Read More →The single largest industrial application
Question: The single largest industrial application of dihydrogen is :Manufacture of metal hydridesRocket fuel in space researchIn the synthesis of ammoniaIn the synthesis of nitric acidCorrect Option: , 3 Solution: Informative, according to ncert uses of di hydrogen. In fact $\mathrm{NH}_{3}$ largest production in used to manufacture nitrogenous fertilisers....
Read More →The first order rate constant for the decomposition
Question: The first order rate constant for the decomposition of $\mathrm{CaCO}_{3}$ at $700 \mathrm{~K}$ is $6.36 \times 10^{-3} \mathrm{~s}^{-1}$ and activation energy is $209 \mathrm{~kJ} \mathrm{~mol}^{-1}$. Its rate constant (in $\mathrm{s}^{-1}$ ) at $600 \mathrm{~K}$ is $\mathrm{X} \times 10^{-6}$. The value of $\mathrm{x}$ is_________________(Nearest integer) $\left[\right.$ Given $\mathrm{R}=8.31 \mathrm{~J} \mathrm{~K}^{-1} \mathrm{~mol}^{-1} ; \log 6.36 \times 10^{-3}=-2.19$, $\left.1...
Read More →The single largest industrial application
Question: The single largest industrial application of dihydrogen is :Manufacture of metal hydridesRocket fuel in space researchIn the synthesis of ammoniaIn the synthesis of nitric acidCorrect Option: , 3 Solution: Informative, according to ncert uses of di hydrogen. In fact $\mathrm{NH}_{3}$ largest production in used to manufacture nitrogenous fertilisers....
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Question: Identify correct $\mathbf{A}, \mathbf{B}$ and $\mathbf{C}$ in the reaction sequence given below: Correct Option: 1 Solution:...
Read More →The correct structures of A and B formed in the following reactions are :
Question: The correct structures of A and B formed in the following reactions are : Correct Option: , 4 Solution:...
Read More →The major product (P) in the following
Question: The major product (P) in the following reaction is : Correct Option: , 2 Solution:...
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Question: In the above reactions, product $A$ and product $B$ respectively are:Correct Option: , 4 Solution:...
Read More →Which one of the following is formed (mainly) when red phosphorus is heated in a sealed tube at 803 K ?
Question: Which one of the following is formed (mainly) when red phosphorus is heated in a sealed tube at 803 K ?White phosphorusYellow phosphorus$\beta$-Black phosphorus$\alpha$-Black phosphorusCorrect Option: , 4 Solution: When red phosphorus is heated in a sealed tube at $803 \mathrm{~K}, \alpha$-black phosphorus is formed....
Read More →The major product of the following reaction is :
Question: The major product of the following reaction is : Correct Option: 3, Solution: $\mathrm{NaOH}+\mathrm{EtOH}$ is known as alcoholic $\mathrm{NaOH}$, so it give $E^{2}$ reaction with given alkyl halide....
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