Monomer units of Dacron polymer are :
Question: Monomer units of Dacron polymer are : ethylene glycol and phthalic acidethylene glycol and terephthalic acidglycerol and terephthalic acidglycerol and phthalic acidCorrect Option: , 2 Solution:...
Read More →A and B decompose via first order kinetics with half-lives 54.0 min and 18.0 min respectively.
Question: A and B decompose via first order kinetics with half-lives $54.0 \mathrm{~min}$ and $18.0 \mathrm{~min}$ respectively. Starting from an equimolar non reactive mixture of $\mathrm{A}$ and $\mathrm{B}$, the time taken for the concentration of A to become 16 times that of B is min. (Round off to the Nearest Integer). Solution: $\Rightarrow$ To calculate : $\left[\mathrm{A}_{\mathrm{t}}\right]=16 \times\left[\mathrm{B}_{\mathrm{t}}\right] \ldots . .(1)$ time $=?$ $\mathrm{n} \rightarrow$ n...
Read More →Given below are two statements :
Question: Given below are two statements : Statement I : Sphalerite is a sulphide ore of zinc and copper glance is a sulphide ore of copper. Statement II : It is possible to separate two sulphide ores by adjusting proportion of oil to water or by using 'depressants' in a froth flotation method. Choose the most appropriate answer from the options given below :Statement I is true but Statement II is false.Both Statement I and Statement II are true.Statement I is false but Statement II is true.Both...
Read More →In Tollen's test for aldehyde, the overall number
Question: In Tollen's test for aldehyde, the overall number of electron(s) transferred to the Tollen's reagent formula $\left[\mathrm{Ag}\left(\mathrm{NH}_{3}\right)_{2}\right]^{+}$per aldehyde group to form silver mirror is__________ -(Round off to the Nearest integer) Solution: $\mathrm{AgNO}_{3}+\mathrm{NaOH} \rightarrow \mathrm{AgOH}+\mathrm{NaNO}_{3}$ $2 \mathrm{AgOH} \rightarrow \mathrm{Ag}_{2} \mathrm{O}+\mathrm{H}_{2} \mathrm{O}$ $\mathrm{Ag}_{2} \mathrm{O}+4 \mathrm{NH}_{3}+\mathrm{H}_{...
Read More →The sol given below with
Question: The sol given below with negatively charged colloidal particles is :$\mathrm{FeCl}_{3}$ added to hot water$\mathrm{KI}$ added to $\mathrm{AgNO}_{3}$ solution$\mathrm{AgNO}_{3}$ added to $\mathrm{KI}$ solution$\mathrm{Al}_{2} \mathrm{O}_{3} \cdot \mathrm{xH}_{2} \mathrm{O}$ in waterCorrect Option: , 3 Solution: Official Ans. by NTA (3)...
Read More →Indicate the complex
Question: Indicate the complex/complex ion which did not show any geometrical isomerism :$\left[\mathrm{CoCl}_{2}(\mathrm{en})_{2}\right]$$\left[\mathrm{Co}(\mathrm{CN})_{5}(\mathrm{NC})\right]^{3-}$$\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{3}\left(\mathrm{NO}_{2}\right)_{3}\right]$$\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{Cl}_{2}\right]^{+}$Correct Option: 2 Solution: (1) $\left[\mathrm{CoCl}_{2}(\mathrm{en})_{2}\right]$ show Cis-trans isomerism (2) $\left[\mathrm{Co}(\ma...
Read More →The gas phase reaction
Question: The gas phase reaction $2 \mathrm{~A}(\mathrm{~g}) \rightleftharpoons \mathrm{A}_{2}(\mathrm{~g})$ at $400 \mathrm{~K}$ has $\Delta \mathrm{G}^{\circ}=+25.2 \mathrm{~kJ} \mathrm{~mol}^{-1}$. The equilibrium constant $\mathrm{K}_{\mathrm{C}}$ for this reaction is_______ $\times 10^{-2}$. (Round off to the Nearest integer) $\left[\right.$ Use $: R=8.3 \mathrm{~J} \mathrm{~mol}^{-1} \mathrm{~K}^{-1}, \ln 10=2.3$ $\left.\log _{10} 2=0.30,1 \mathrm{~atm}=1 \mathrm{bar}\right]$ [antilog $(-0...
Read More →Solve the following
Question: The major product in the above reaction is :Correct Option: 1 Solution:...
Read More →A 5.0 m mol
Question: A $5.0 \mathrm{~m} \mathrm{~mol} \mathrm{dm}^{-3}$ aqueous solution of $\mathrm{KCl}$ has a conductance of $0.55 \mathrm{mS}$ when measured in a cell constant $1.3 \mathrm{~cm}^{-1}$. The molar conductivity of this solution is__________ $\mathrm{mSm}^{2} \mathrm{~mol}^{-1}$. (Round off to the Nearest Integer) Solution: Given conc $^{\mathrm{n}}$ of $\mathrm{KCl}=\frac{\mathrm{m} \cdot \mathrm{mol}}{\mathrm{L}}$ : Conductance $(\mathrm{G})=0.55 \mathrm{mS}$ : Cell constant $\left(\frac{...
Read More →A xenon compound 'A' upon partial hydrolysis
Question: A xenon compound 'A' upon partial hydrolysis gives $\mathrm{XeO}_{2} \mathrm{~F}_{2}$. The number of lone pair of electrons present in compound $A$ is_________ (Round off to the Nearest integer) Solution: Total l.p. on $(\mathrm{A})=19$...
Read More →The Crystal Field Stabilization Energy
Question: The Crystal Field Stabilization Energy (CFSE) and magnetic moment (spin-only) of an octahedral aqua complex of a metal ion $\left(\mathrm{M}^{2+}\right)$ are $-0.8 \Delta_{0}$ and $3.87 \mathrm{BM}$, respectively. Identify $\left(\mathrm{M}^{2+}\right)$ :$\mathrm{V}^{3+}$$\mathrm{Cr}^{3+}$$\mathrm{Mn}^{4+}$$\mathrm{Co}^{2+}$Correct Option: , 4 Solution: $=2$ unpaired $\mathrm{e}^{-}$ $\mu=2.89 \mathrm{Bm}$ $=-0.8 \Delta_{0}$ hence $\mathrm{d}^{7}$ configuration is of $\mathrm{Co}^{2+}$...
Read More →The number of species below that have two lone
Question: The number of species below that have two lone pairs of electrons in their central atom is__________ (Round off to the Nearest integer) Solution: Two 1.p. on central atom is $=\mathrm{ClF}_{3}, \mathrm{XeF}_{4}$...
Read More →The molar conductivities at infinite dilution of barium chloride,
Question: The molar conductivities at infinite dilution of barium chloride, sulphuric arid and hydrochloric acid are 280,860 and $426 \mathrm{Scm}^{2}$ $\mathrm{mol}^{-1}$ respectively. The molar conductivity at infinite dilution of barium sulphate is $\mathrm{S} \mathrm{cm}^{2} \mathrm{~mol}^{-1}$ (Round off to the Nearest Integer). Solution: From Kohlrausch's law $\Lambda_{\mathrm{m}}^{\infty}\left(\mathrm{BaSO}_{4}\right)=\lambda_{\mathrm{m}}^{\infty}\left(\mathrm{Ba}^{2+}\right)+\lambda_{\ma...
Read More →Ga (atomic mass 70 u ) crystallizes in a hexagonal close packed structure.
Question: Ga (atomic mass $70 \mathrm{u}$ ) crystallizes in a hexagonal close packed structure. The total number of voids in $0.581 \mathrm{~g}$ of $\mathrm{Ga}$ is__________ $\times 10^{21}$. (Round off to the Nearest Integer). Solution: HCP structure : Per atom, there will be one octahedral void (OV) and two tetrahedral voids (TV). Therefore total three voids per atom are present in HCP structure. $\rightarrow$ therefore total no of atoms of Ga will be- $=\frac{\text { Mass }}{\text { Molar Ma...
Read More →Match List - I with List - II.
Question: Match List - I with List - II. Choose the most appropriate answer from the options given below.(a)-(i), (b)-(iii), (c)-(ii), (d)-(iv)(a)-(iv), (b)-(i), (c)-(iii), (d)-(ii)(a)-(iv), (b)-(ii), (c)-(iii), (d)-(i)(a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)Correct Option: , 2 Solution: According to type of reactions for preparation, colloids have been classified...
Read More →A reaction has a half life of
Question: A reaction has a half life of $1 \mathrm{~min}$. The time required for $99.9 \%$ completion of the reaction is________ $\min$. (Round off to the Nearest integer) $[$ Use : $\ln 2=0.69, \ln 10=2.3]$ Solution: $\frac{\mathrm{t}_{99.9 \%}}{\mathrm{t}_{50 \%}}=\frac{\frac{1}{\mathrm{~K}} \ln \frac{100}{0.1}}{\frac{1}{\mathrm{~K}} \ln 2}$ $=\frac{\ln 1000}{\ln 2} \times \mathrm{t}_{50 \%}$ $=\frac{3 \ln 10}{\ln 2} \times 1$ $=\frac{3 \times 2.3}{0.69}=10$...
Read More →Given below are two statements :
Question: Given below are two statements : one is labelled as Assertion (A) and the other is labelled as Reason (R). Assertion (A) : Barium carbonate is insoluble in water and is highly stable. Reason (R) : The thermal stability of the carbonates increases with increasing cationic size.Both (A) and (R) are true but (R) is the true explanation of (A)(A) is true but $\mathbf{( R )}$ is falseBoth $(\mathbf{A})$ and $\mathbf{( R )}$ are true and $\mathbf{( R )}$ is not the true explanation of (A)(A)...
Read More →A hard substance melts at high temperature and
Question: A hard substance melts at high temperature and is an insulator in both solid and in molten state. This solid is most likely to be a / an :Ionic solidMolecular solidMetallic solidCovalent solidCorrect Option: , 4 Solution: Covalent or network solid have very high melting point and they are insulators in their solid and molten form....
Read More →Match List-I with List-II :
Question: Match List-I with List-II : Choose the most appropriate match :$\mathrm{a}-\mathrm{ii}, \mathrm{b}-\mathrm{iv}, \mathrm{c}-\mathrm{iii}, \mathrm{d}-\mathrm{i}$a-iv, b-ii, c-iii, d-ia-ii, b-iii, c-iv, d-ia-iii, b-ii, c-i, d-ivCorrect Option: , 3 Solution:...
Read More →In the following sequence of reactions a compound
Question: In the following sequence of reactions a compound $\mathbf{A}$, (molecular formula $\mathrm{C}_{6} \mathrm{H}_{12} \mathrm{O}_{2}$ ) with a straight chain structure gives a $\mathrm{C}_{4}$ carboxylic acid. $\mathbf{A}$ is : $\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{COO}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{CH}_{3}$$\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{COO}-\mathrm{CH}_{2}-\mathrm{CH}_{3}$$\mathrm{CH}_{3}-\mathrm{CH}_{2}-\mathrm{CH}_{2}-\mathrm{O}-\mathrm{CH}=\math...
Read More →In the following molecules,
Question: In the following molecules, Hybridisation of carbon $\mathrm{a}, \mathrm{b}$ and c respectively are :$\mathrm{sp}^{3}, \mathrm{sp}, \mathrm{sp}$$\mathrm{sp}^{3}, \mathrm{sp}^{2}, \mathrm{sp}$$\mathrm{sp}^{3}, \mathrm{sp}^{2}, \mathrm{sp}^{2}$$\mathrm{sp}^{3}, \mathrm{sp}, \mathrm{sp}^{2}$Correct Option: , 3 Solution:...
Read More →Match list-I with list-II :
Question: Match list-I with list-II : Choose the most appropriate answer from the option given below:$\mathrm{a}-\mathrm{i}, \mathrm{b}-\mathrm{iv}, \mathrm{c}-\mathrm{ii}, \mathrm{d}-\mathrm{iii}$a-ii, b-iii, c-i, d-iva-ii, b-iii, c-iv, d-ia-ii, b-iv, c-iii, d-iCorrect Option: , 3 Solution: (a) Mercury $\rightarrow$ Distillation refining (b) Copper $\rightarrow$ Electrolytic refining (c) Silicon $\rightarrow$ Zone refining (d) Nickel $\rightarrow$ Vapour phase refining...
Read More →Identify A in the following reaction.
Question: Identify A in the following reaction. Correct Option: 1 Solution:...
Read More →Given below are two statements :
Question: Given below are two statements : one is labelled as Assertion (A) and other is labelled as Reason (R). Assertion (A) : Sucrose is a disaccharide and a non-reducing sugar. Reason (R) : Sucrose involves glycosidic linkage between $C_{1}$ of $\beta$-glucose and $C_{2}$ of $\alpha$-fructose. Choose the most appropriate answer from the options given below :Both (A) and (R) are true but (R) is not the true explanation of (A)(A) is false but $\mathbf{( R )}$ is true.(A) is true but (R) is fal...
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