Solve this following
Question: In the ground state of atomic $\mathrm{Fe}(\mathrm{Z}=26)$, the spin-only magnetic moment is $\times 10^{-1} \mathrm{BM}$. (Round off to the Nearest Integer). $[$ Given $: \sqrt{3}=1.73, \sqrt{2}=1.41]$ Solution: Number of unpaired $\mathrm{e}^{-}=4$ $\mu=\sqrt{4(4+2)}$ B.M. $\mu=\sqrt{24}$ B.M. $\mu=4.89$ B.M. $\mu=48.9 \times 10^{-1}$ B.M. Nearest integer value will be 49 ....
Read More →Ammonolysis of Alkyl halides followed by the treatment with NaOH solution can be used to prepare primary, secondary and tertiary amines.
Question: Ammonolysis of Alkyl halides followed by the treatment with NaOH solution can be used to prepare primary, secondary and tertiary amines. The purpose of NaOH in the reaction is :to remove basic impuritiesto activate $\mathrm{NH}_{3}$ used in the reactionto remove acidic impuritiesto increase the reactivity of alkyl halideCorrect Option: , 3 Solution: So the purpose of $\mathrm{NaOH}$ in the above reactions in to remove acidic impurities....
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Question: A 1 molal $\mathrm{K}_{4} \mathrm{Fe}(\mathrm{CN})_{6}$ solution has a degree of dissociation of $0.4$. Its boiling point is equal to that of another solution which contains $18.1$ weight percent of a non electrolytic solute $\mathrm{A}$. The molar mass of $\mathrm{A}$ is u. (Round off to the Nearest Integer). [Density of water $=1.0 \mathrm{~g} \mathrm{~cm}^{-3}$ ] Solution: Effective molality $=0.6+1.6+0.4=2.6 \mathrm{~m}$ For same boiling point, the molality of another solution shou...
Read More →The correct statements about H2O2 are :
Question: The correct statements about $\mathrm{H}_{2} \mathrm{O}_{2}$ are : (A) used in the treatment of effluents. (B) used as both oxidising and reducing agents. (C) the two hydroxyl groups lie in the same plane. (D) miscible with water. Choose the correct answer from the options given below :(A), (B), (C) and (D)(A), (B) and (D) only(B), (C) and (D) only(A), (C) and (D) onlyCorrect Option: , 2 Solution: $\mathrm{H}_{2} \mathrm{O}_{2}$ is used in the treatment of effluents. $\mathrm{H}_{2} \m...
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Question: The total number of $\mathrm{C}-\mathrm{C}$ sigma bond/s in mesityl oxide $\left(\mathrm{C}_{6} \mathrm{H}_{10} \mathrm{O}\right)$ is (Round off to the Nearest Integer). Solution: Mesityle oxide...
Read More →Given below are two statements.
Question: Given below are two statements. Statement I: The choice of reducing agents for metals extraction can be made by using Ellingham diagram, a plot of $\Delta \mathrm{G}$ vs temperature. Statement II: The value of $\Delta \mathrm{S}$ increases from left to right in Ellingham diagram. In the light of the above statements, choose the most appropriate answer from the options given below:Both Statement I and Statement II are trueStatement I is false but Statement II is trueBoth Statement I and...
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Question: The reaction $2 \mathrm{~A}+\mathrm{B}_{2} \rightarrow 2 \mathrm{AB}$ is an elementary reaction. For a certain quantity of reactants, if the volume of the reaction vessel is reduced by a factor of 3 , the rate of the reaction increases by a factor of - (Round off to the Nearest Integer). Solution: Reaction : $2 \mathrm{~A}+\mathrm{B}_{2} \longrightarrow 2 \mathrm{AB}$ As the reaction is elementary, the rate of reaction is $\mathrm{r}=\mathrm{K} \cdot[\mathrm{A}]^{2}\left[\mathrm{~B}_{2...
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Question: On complete reaction of $\mathrm{FeCl}_{3}$ with oxalic acid in aqueous solution containing $\mathrm{KOH}$, resulted in the formation of product A. The secondary valency of Fe in the product $A$ is (Round off to the Nearest Integer). Solution: $\mathrm{Fe}^{3+}+3 \mathrm{~K}^{+}+3 \mathrm{C}_{2} \mathrm{O}_{4}{ }^{2-} \rightarrow \mathrm{K}_{3}\left[\mathrm{Fe}\left(\mathrm{C}_{2} \mathrm{O}_{4}\right)_{3}\right]$ Secondary valency of $\mathrm{Fe}$ in ' $\mathrm{A}^{\prime}$ is 6 ....
Read More →The oxide that shows magnetic property is :
Question: The oxide that shows magnetic property is :$\mathrm{SiO}_{2}$$\mathrm{Mn}_{3} \mathrm{O}_{4}$$\mathrm{Na}_{2} \mathrm{O}$$\mathrm{Mg} \mathrm{O}$Correct Option: , 2 Solution: $\mathrm{Mn}_{3} \mathrm{O}_{4}$ shows magnetic properties....
Read More →The INCORRECT statement regarding the
Question: The INCORRECT statement regarding the structure of $C_{60}$ is :The six-membered rings are fused to both six and five-membered rings.Each carbon atom forms three sigma bondsThe five-membered rings are fused only toIt contains 12 six-membered rings and 24 five-membered rings.Correct Option: , 4 Solution: Structure of $C_{60}$...
Read More →Which one of the following methods is most suitable
Question: Which one of the following methods is most suitable for preparing deionized water?Synthetic resin methodClark's methodCalgon's methodPermutit methodCorrect Option: 1, Solution: Pure demineralised (de-ionized) water free from all soluble mineral salts is obtained by passing water successively through a cation exchange (in the $\mathrm{H}^{+}$ form) and an anion exchange (in the $\mathrm{OH}$ form) resins....
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Question: A $\mathrm{KCl}$ solution of conductivity $0.14 \mathrm{~S} \mathrm{~m}^{-1}$ shows a resistance of $4.19 \Omega$ in a conductivity cell. If the same cell is filled with an $\mathrm{HCl}$ solution, the resistance drops to $1.03 \Omega$. The conductivity of the $\mathrm{HCl}$ solution is $\times 10^{-2} \mathrm{~S} \mathrm{~m}^{-1}$. (Round off to the Nearest Integer). Solution: $\kappa=\frac{1}{R} \cdot G^{*}$ For same conductivity cell, $\mathrm{G}^{*}$ is constant and hence $\kappa ....
Read More →In the reaction of hypobromite with amide,
Question: In the reaction of hypobromite with amide, the carbonyl carbon is lost as:$\mathrm{CO}_{3}^{2-}$$\mathrm{HCO}_{3}^{-}$$\mathrm{CO}_{2}$$\mathrm{CO}$Correct Option: 1 Solution:...
Read More →During which of the following processes, does entropygdecrease?
Question: During which of the following processes, does entropygdecrease? (A) Freezing of water to ice at $0^{\circ} \mathrm{C}$ (B) Freezing of water to ice at $-10^{\circ} \mathrm{C}$ (C) $\mathrm{N}_{2}(\mathrm{~g})+3 \mathrm{H}_{2}(\mathrm{~g}) \rightarrow 2 \mathrm{NH}_{3}(\mathrm{~g})$ (D) Adsorption of $\mathrm{CO}(\mathrm{g})$ and lead surface (E) Dissolution of $\mathrm{NaCl}$ in water$(\mathrm{A}),(\mathrm{B}),(\mathrm{C})$ and $(\mathrm{D})$ only(B) and (C) only(A) and (E) only(A), (C...
Read More →In basic medium, H2O2 exhibits which of the following reactions ?
Question: In basic medium, $\mathrm{H}_{2} \mathrm{O}_{2}$ exhibits which of the following reactions ? (A) $\mathrm{Mn}^{2+} \rightarrow \mathrm{Mn}^{4+}$ (B) $\mathrm{I}_{2} \rightarrow \mathrm{I}^{-}$ (C) $\mathrm{PbS} \rightarrow \mathrm{PbSO}_{4}$ Choose the most appropriate answer from the options given below : (A), (C) only(A) only(B) only(A), (B) onlyCorrect Option: , 4 Solution: In basic medium, oxidising action of $\mathrm{H}_{2} \mathrm{O}_{2}$. $\mathrm{Mn}^{2+}+\mathrm{H}_{2} \mathrm...
Read More →The oxidation states of nitrogen in
Question: The oxidation states of nitrogen in $\mathrm{NO}, \mathrm{NO}_{2}$, $\mathrm{N}_{2} \mathrm{O}$ and $\mathrm{NO}_{3}^{-}$are in the order of:$\mathrm{NO}_{3}^{-}\mathrm{NO}_{2}\mathrm{NO}\mathrm{N}_{2} \mathrm{O}$$\mathrm{NO}_{2}\mathrm{NO}_{3}^{-}\mathrm{NO}\mathrm{N}_{2} \mathrm{O}$$\mathrm{N}_{2} \mathrm{O}\mathrm{NO}_{2}\mathrm{NO}\mathrm{NO}_{3}^{-}$$\mathrm{NO}\mathrm{NO}_{2}\mathrm{N}_{2} \mathrm{O}\mathrm{NO}_{3}^{-}$Correct Option: 1 Solution: The oxidation states of Nitrogen ...
Read More →Choose the correct statement regarding the formation of carbocations A and B given :-
Question: Choose the correct statement regarding the formation of carbocations A and B given :- Carbocation B is more stable and formed relatively at faster rateCarbocation A is more stable and formed relatively at slow rateCarbocation B is more stable and formed relatively at slow rateCarbocation A is more stable and formed relatively at faster rateCorrect Option: 1 Solution: This is more stable due to secondary cation formation and formed with faster rate due to low activation energy....
Read More →Statement I : Sodium hydride can be used as an oxidising agent.
Question: Statement I : Sodium hydride can be used as an oxidising agent. Statement II : The lone pair of electrons on nitrogen in pyridine makes it basic. Choose the CORRECT answer from the options given below :Both statement I and statement II are falseStatement I is true but statement II is falseStatement I is false but statement II is trueBoth statement I and statement II are trueCorrect Option: , 3 Solution: (1) $\mathrm{NaH}$ (sodium Hydride) is used as a reducing reagent. N atom, it is ba...
Read More →Among the following compounds I-IV, which one forms a yellow
Question: Among the following compounds I-IV, which one forms a yellow precipitate on reacting sequentially with (i) $\mathrm{NaOH}$ (ii) dil. $\mathrm{HNO}_{3}$ (iii) $\mathrm{AgNO}_{3}$ ? IIIVIIIICorrect Option: 2, Solution: Other compounds halide can't be removed because corresponding $\mathrm{C}^{+}$is highly unstable....
Read More →Which of the following statement(s) is (are) incorrect reason for eutrophication ?
Question: Which of the following statement(s) is (are) incorrect reason for eutrophication ? (A) excess usage of fertilisers (B) excess usage of detergents (C) dense plant population in water bodies (D) lack of nutrients in water bodies that prevent plant growth Choose the most appropriate answer from the options given below: (A) only(C) only(B) and (D) only(D) onlyCorrect Option: , 4 Solution: The process in which nutrient enriched water bodies support a dense plant population which kills anima...
Read More →Which of the following polymer is used in the manufacture of wood laminates ?
Question: Which of the following polymer is used in the manufacture of wood laminates ?cis-poly isopreneMelamine formaldehyde resinUrea formaldehyde resinPhenol and formaldehyde resinCorrect Option: , 3 Solution: Urea HCHO resin is used in manufacture of wood laminates...
Read More →For the coagulation of a negative sol, the species below, that has the highest flocculating power is :
Question: For the coagulation of a negative sol, the species below, that has the highest flocculating power is : $\mathrm{SO}_{4}^{2-}$$\mathrm{Ba}^{2+}$$\mathrm{Na}^{+}$$\mathrm{PO}_{4}^{3-}$Correct Option: , 2 Solution: To coagulate negative sol, cation with higher charge has higher coagulation value....
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Question: In the above reaction, the structural formula of (A), "X" and "Y" respectively are : Correct Option: 1 Solution:...
Read More →Fex2 and Fey3 are known when x and y are :
Question: $\mathrm{Fex}_{2}$ and $\mathrm{Fey}_{3}$ are known when $\mathrm{x}$ and $\mathrm{y}$ are$\mathrm{x}=\mathrm{F}, \mathrm{Cl}, \mathrm{Br}, \mathrm{I}$ and $\mathrm{y}=\mathrm{F}, \mathrm{Cl}, \mathrm{Br}$$\mathrm{x}=\mathrm{F}, \mathrm{Cl}, \mathrm{Br}$ and $\mathrm{y}=\mathrm{F}, \mathrm{Cl}, \mathrm{Br}, \mathrm{I}$$\mathrm{x}=\mathrm{Cl}, \mathrm{Br}, \mathrm{I}$ and $\mathrm{y}=\mathrm{F}, \mathrm{Cl}, \mathrm{Br}, \mathrm{I}$$\mathrm{x}=\mathrm{F}, \mathrm{Cl}, \mathrm{Br}, \math...
Read More →One of the by-products formed during the recovery of $mathrm{NH}_{2}$ from Solvay process is :
Question: One of the by-products formed during the recovery of $\mathrm{NH}_{2}$ from Solvay process is :$\mathrm{Ca}(\mathrm{OH})_{2}$$\mathrm{NaHCO}_{3}$$\mathrm{CaCl}_{2}$$\mathrm{NH}_{4} \mathrm{Cl}$Correct Option: , 3 Solution: $\mathrm{CaCl}_{2}$...
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