The bond order and magnetic
Question: The bond order and magnetic behaviour of $\mathrm{O}_{2}^{-}$ion are, respectively:$1.5$ and paramagnetic$1.5$ and diamagnetic2 and diamagnetic1 and paramagneticCorrect Option: 1 Solution: $\mathrm{O}_{2}^{-}=\left(\sigma_{1 \mathrm{~s}}\right)^{2}\left(\sigma_{1 \mathrm{~s}}^{*}\right)^{2}\left(\sigma_{2 \mathrm{~s}}\right)^{2}\left(\sigma_{2 \mathrm{~s}}^{*}\right)^{2}\left(\sigma_{2 \mathrm{p}_{\mathrm{z}}}\right)^{2}$ $\left(\pi_{2 p_{x}}^{2}=\pi_{2 p_{y}}^{2}\right)\left(\pi_{2 p_...
Read More →Given below are two statements:
Question: Given below are two statements: Statement I : Non-biodegradable wastes are generated by the thermal power plants. Statement II : Bio-degradable detergents leads to eutrophication. In the light of the above statements, choose the most appropriate answer from the option 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 true.Correct Option: 4, Solution: Non...
Read More →Which one of the following given graphs represents the variation of rate constant
Question: Which one of the following given graphs represents the variation of rate constant $(\mathrm{k})$ with temperature (T) for an endothermic reaction ?Correct Option: , 3 Solution: By observation we get this plot during measurable temperatures Ans. $3^{\text {rd }}$ Option....
Read More →The number of non-ionisable
Question: The number of non-ionisable hydrogen atoms present in the final product obtained from the hydrolysis of $\mathrm{PCl}_{5}$ is :0213Correct Option: 1 Solution: all hydrogens are ionisable $\therefore$ Ans is zero....
Read More →The exact volumes of 1 M Noah solution required to neutralize 50 mL
Question: The exact volumes of $1 \mathrm{M} \mathrm{NaOH}$ solution required to neutralise $50 \mathrm{~mL}$ of $1 \mathrm{M} \mathrm{H}_{3} \mathrm{PO}_{3}$ solution and $100 \mathrm{~mL}$ of $2 \mathrm{M} \mathrm{H}_{3} \mathrm{PO}_{2}$ solution, respectively, are :$100 \mathrm{~mL}$ and $100 \mathrm{~mL}$$100 \mathrm{~mL}$ and $50 \mathrm{~mL}$$100 \mathrm{~mL}$ and $200 \mathrm{~mL}$$50 \mathrm{~mL}$ and $50 \mathrm{~mL}$Correct Option: 3, Solution: $\mathrm{H}_{3} \mathrm{PO}_{3}+2 \mathrm...
Read More →Experimentally reducing a functional group cannot be done by which one of the following reagents?
Question: Experimentally reducing a functional group cannot be done by which one of the following reagents?$\mathrm{Pt}-\mathrm{C} / \mathrm{H}_{2}$$\mathrm{Na} / \mathrm{H}_{2}$$\mathrm{Pd}-\mathrm{C} / \mathrm{H}_{2}$$\mathrm{Zn} / \mathrm{H}_{2} \mathrm{O}$Correct Option: , 2 Solution: Solution $\mathrm{NaH}$, is not reducing agent...
Read More →The interaction energy of London
Question: The interaction energy of London forces between two particles is proportional to $\mathrm{r}^{\mathrm{x}}$, where $\mathrm{r}$ is the distance between the particles. The value of $x$ is :3-3-66Correct Option: , 3 Solution: For london dispersion forces. $E \propto \frac{1}{r^{6}}$ Hence $x=-6$...
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) : Photochemical smog causes cracking of rubber. Reason (R) : Presence of ozone, nitric oxide, acrolein, formaldehyde and peroxyacetyl nitrate in photochemical smog makes it oxidizing. 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 tru...
Read More →Calamine and Malachite, respectively are the ores of:
Question: Calamine and Malachite, respectively are the ores of:Nickel and AluminiumZinc and CopperCopper and IronAluminium and ZincCorrect Option: , 2 Solution: Calamine $\Rightarrow \mathrm{ZnCO}_{3}$ Malachite $\Rightarrow \mathrm{Cu}(\mathrm{OH})_{2} \cdot \mathrm{CuCO}_{3}$...
Read More →Given below are two statements:
Question: Given below are two statements: Statement I : $\mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}$ and $\mathrm{AgCN}$ both can generate nucleophile. Statement II : $\mathrm{KCN}$ and $\mathrm{AgCN}$ both will generate nitrile nucleophile with all reaction conditions. Choose the most appropriate option :Statement I is true but statement II is falseBoth statement I and statement II are trueStatement $I$ is false but statement II is trueBoth statement I and statement II are falseCorrect Option: 1...
Read More →Which one of the following phenols
Question: Which one of the following phenols does not give colour when condensed with phthalic anhydride in presence of conc. $\mathrm{H}_{2} \mathrm{SO}_{4}$ ?Correct Option: , 2 Solution: Only p-methyl, phenol does not give any colour with phthalic anhydroxide with cons. $\mathrm{H}_{2} \mathrm{SO}_{4}$....
Read More →Water sample is called cleanest on the basis of which one of the BOD values given below
Question: Water sample is called cleanest on the basis of which one of the BOD values given below$11 \mathrm{ppm}$$15 \mathrm{ppm}$3 ppm$21 \mathrm{ppm}$Correct Option: , 3 Solution: Clean water could have BOD value of less than $5 \mathrm{ppm}$ whereas highly polluted water could have a BOD value of $17 \mathrm{ppm}$ or more....
Read More →Arrange the following metal complex/ compounds in the increasing order of spin only magnetic moment.
Question: Arrange the following metal complex/ compounds in the increasing order of spin only magnetic moment. Presume all the three, high spin system. (Atomic numbers $\mathrm{Ce}=58, \mathrm{Gd}=64$ and $\mathrm{Eu}=63 .$ ) (a) $\left(\mathrm{NH}_{4}\right)_{2}\left[\mathrm{Ce}\left(\mathrm{NO}_{3}\right)_{6}\right]$ (b) $\mathrm{Gd}\left(\mathrm{NO}_{3}\right)_{3}$ and (c) $\mathrm{Eu}\left(\mathrm{NO}_{3}\right)_{3}$$(\mathrm{b})(\mathrm{a})(\mathrm{c})$(c) $(\mathrm{a})(\mathrm{b})$(a) $(b)...
Read More →Match list-I with list-II :
Question: Match list-I with list-II : Choose the most appropriate answer the option given below:a-iv, b-iii, c-i, d-iia-iv, b-iii, c-ii, d-ia-iii, b-iv, c-v, d-iia-iii, b-iv, c-ii, d-vCorrect Option: , 2 Solution: (a) $\mathrm{Be} \rightarrow$ it is used in the Windows of X-ray tubes (b) $\mathrm{Mg} \rightarrow$ it is used in the Incendiary bombs and signals (c) $\mathrm{Ca} \rightarrow$ it is used in the Extraction of metals (d) $\mathrm{Ra} \rightarrow$ it is used in the Treatment of cancer...
Read More →An aqueous KCI solution of density
Question: An aqueous $\mathrm{KCl}$ solution of density $1.20 \mathrm{~g} \mathrm{~mL}^{-1}$ has a molality of $3.30 \mathrm{~mol} \mathrm{~kg}^{-1}$. The molarity of the solution in $\mathrm{mol} \mathrm{L}^{-1}$ is (Nearest integer) $[$ Molar mass of $\mathrm{KCl}=74.5]$ Solution: $1000 \mathrm{~kg}$ solvent has $3.3$ moles of $\mathrm{KCl}$ $1000 \mathrm{~kg}$ solvent $\longrightarrow 3.3 \times 74.5 \mathrm{gm} \mathrm{KCl}$ $\longrightarrow \quad 245.85$ Weight of solution $=1245.85 \mathrm...
Read More →Prove the following
Question: Consider the above reaction, the product ' $\mathrm{X}$ ' and 'Y' respectively are :Correct Option: , 3 Solution:...
Read More →The total number of negative charge
Question: The total number of negative charge in the tetrapeptide, Gly-Glu-Asp-Tyr, at pH $12.5$ will be . (Integer answer) Solution:...
Read More →The INCORRECT statements below regarding colloidal solutions is :
Question: The INCORRECT statements below regarding colloidal solutions is :A colloidal solution shows colligative properties.An ordinary filter paper can stop the flow of colloidal particles.The flocculating power of $\mathrm{Al}^{3+}$ is more than that of $\mathrm{Na}^{+}$.A colloidal solution shows Brownian motion of colloidal particles.Correct Option: , 2 Solution: * Colloidel solution exhibits colligative properties * An ordinary filter can not stop the flow of colloidal particles. * Floccul...
Read More →The Born-Haber cycle for
Question: The Born-Haber cycle for $\mathrm{KCl}$ is evaluated with the following data : $\Delta_{f} \mathrm{H}^{\ominus}$ for $\mathrm{KCl}=-436.7 \mathrm{~kJ} \mathrm{~mol}^{-1}$ $\Delta_{\text {sub }} \mathrm{H}^{\ominus}$ for $\mathrm{K}=89.2 \mathrm{~kJ} \mathrm{~mol}^{-1}$ $\Delta_{\text {inination }} \mathrm{H}^{\ominus}$ for $\mathrm{K}=419.0 \mathrm{~kJ} \mathrm{~mol}^{-1} ; \Delta_{\text {clatra }}$ gin $\mathrm{H}^{\ominus}$ for $\mathrm{Cl}_{(\mathrm{g})}$ $=-348.6 \mathrm{~kJ} \math...
Read More →Match List - I with List - II :
Question: Match List - I with List - II : (a)-(ii), (b)-(iii), (c)-(iv), (d)-(i)(a)-(iv), (b)-(iii), (c)-(ii), (d)-(i)(a)-(iii), (b)-(iv), (c)-(i), (d)-(ii)(a)-(ii), (b)-(iv), (c)-(i), (d)-(iii)Correct Option: 3, Solution: (A) Antifertility drug $\rightarrow$ (iii) Nor ethindrone (B) Antibiotic $\rightarrow$ (iv) Salvarsan (C) Tranquilizer $\rightarrow$ (i) Meprobamate (D) Artificial sweetener $\rightarrow$ (ii) Alitame A-iii, B-iv, C-i, D-ii...
Read More →The following data was obtained for chemical reaction given below at $975 mathrm{~K}$.
Question: The following data was obtained for chemical reaction given below at $975 \mathrm{~K}$. $2 \mathrm{NO}_{(\mathrm{g})}+2 \mathrm{H}_{2(\mathrm{~g})} \rightarrow \mathrm{N}_{2(\mathrm{~g})}+2 \mathrm{H}_{2} \mathrm{O}_{(\mathrm{g})}$ $\begin{array}{lcl}{[\mathrm{NO}]} {\left[\mathrm{H}_{2}\right]} \text { Rate } \\ \text { mol } \mathrm{L}^{-1} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~mol} \mathrm{~L}^{-1} \mathrm{~s}^{-1}\end{array}$ (A) $8 \times 10^{-5} \quad 8 \times 10^{-5} \quad 7 \...
Read More →Match List-I with List-II
Question: Match List-I with List-II The correct match is :(a)-(iii), (b)-(i), (c)-(ii), (d)-(iv)(a)-(i), (b)-(iv), (c)-(iii), (d)-(ii)(a)-(iii), (b)-(i), (c)-(iv), (d)-(ii)(a)-(i), (b)-(ii), (c)-(iv), (d)-(iii)Correct Option: , 3 Solution: Match list :- Option-(a)-(iii) ; (b)-(i) ; (c)-(iv); (d)-(ii)...
Read More →The charges on the colloidal CdS sol
Question: The charges on the colloidal $\mathrm{CdS}$ sol and $\mathrm{TiO}_{2}$ sol are, respectively :positive and positivepositive and negativenegative and negativenegative and positiveCorrect Option: , 4 Solution: CdS sol $\rightarrow-$ ve sol $\mathrm{TiO}_{2}$ sol $\rightarrow+$ ve sol...
Read More →The ratio of number of water molecules
Question: The ratio of number of water molecules in Mohr's salt and potash alum is $\times 10^{-1}$. (Integer answer) Solution: Mohr's salt : $\left(\mathrm{NH}_{4}\right)_{2} \mathrm{Fe}\left(\mathrm{SO}_{4}\right)_{2} \cdot 6 \mathrm{H}_{2} \mathrm{O}$ The number of water molecules in Mohr's salt $=6$ Potash alum : $\mathrm{KAl}\left(\mathrm{SO}_{4}\right)_{2} \cdot 12 \mathrm{H}_{2} \mathrm{O}$ The number of water molecules in potash alum $=12$ So ratio of number of water molecules in Mohr's ...
Read More →The number of
Question: The number of $4 f$ electrons in the ground state electronic configuration of $\mathrm{Gd}^{2+}$ is__________. [Atomic number of Gd = 64] Solution: The electronic configuration of ${ }_{64} \mathrm{Gd}:[\mathrm{Xe}] 4 \mathrm{f}^{7} 5 \mathrm{~d}^{1} 6 \mathrm{~s}^{2}$ So the electronic configuration of ${ }_{64} \mathrm{Gd}^{2+}:[\mathrm{Xe}] 4 \mathrm{f}^{7} 5 \mathrm{~d}^{1} 6 \mathrm{~s}^{0}$ i.e. the number of $4 \mathrm{f}$ electrons in the ground state electronic configuration o...
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