In the following sequence of reactions
Question: In the following sequence of reactions the maximum number of atoms present in molecule ' $C^{\prime}$ in one plane is________. (A is a lowest molecular weight alkyne) Solution: Total 13 atom are present in same plane ( 7 carbon 6 hydrogen atoms.)...
Read More →The increasing order of basicity for the following intermediates is (from weak to strong)
Question: The increasing order of basicity for the following intermediates is (from weak to strong) (v) $$ (i) $$ (iv) $$ (ii) $$ (iii)(iii) $$ (i) $$ (ii) $$ (iv) $$ (v)$(\mathrm{v})($ iii $)$ (ii) $$ (iv) $$ (i)(iii) $$ (iv) $$ (ii) $$ (i) $$ (v)Correct Option: , 3 Solution:...
Read More →NaClO_3 is used,
Question: $\mathrm{NaClO}_{3}$ is used, even in spacecrafts, to produce $\mathrm{O}_{2}$. The daily consumption of pure $\mathrm{O}_{2}$ by a person is $492 \mathrm{~L}$ at 1 atm, $300 \mathrm{~K}$. How much amount of $\mathrm{NaClO}_{3}$, in grams, is required to produce $\mathrm{O}_{2}$ for the daily consumption of a person at 1 atm, $300 \mathrm{~K}$ ? $\mathrm{NaClO}_{3}(\mathrm{~s})+\mathrm{Fe}(\mathrm{s}) \rightarrow \mathrm{O}_{2}(\mathrm{~g})+\mathrm{NaCl}(\mathrm{s})+\mathrm{FeO}(\mathr...
Read More →At constant volume,
Question: At constant volume, $4 \mathrm{~mol}$ of an ideal gas when heated from $300 \mathrm{~K}$ to $500 \mathrm{~K}$ changes its internal energy by $5000 \mathrm{~J}$. The molar heat capacity at constant volume is_______ Solution:...
Read More →If enthalpy of atomisation for
Question: If enthalpy of atomisation for $\mathrm{Br}_{2(1)}$ is $x \mathrm{~kJ} / \mathrm{mol}$ and bond enthalpy for $\mathrm{Br}_{2}$ is $\mathrm{y} \mathrm{kJ} / \mathrm{mol}$, the relation between them :is $x=y$is $xy$does not existis $xy$Correct Option: , 4 Solution:...
Read More →For an electrochemical cell
Question: For an electrochemical cell $\mathrm{Sn}(\mathrm{s})\left|\mathrm{Sn}^{2+}(\mathrm{aq}, 1 \mathrm{M}) \| \mathrm{Pb}^{2+}(\mathrm{aq}, 1 \mathrm{M})\right| \mathrm{Pb}(\mathrm{s})$ the ratio $\frac{\left[\mathrm{Sn}^{2+}\right]}{\left[\mathrm{Pb}^{2+}\right]}$ when this cell attains equilibrium is___________. (Given $\mathrm{E}_{\mathrm{Sn}^{2} \mid \mathrm{|sn}}^{0}=-0.14 \mathrm{~V}$, $\left.\mathrm{E}_{\mathrm{Pb}^{2+} \mid \mathrm{Pb}}^{0}=-0.13 \mathrm{~V}, \frac{2.303 \mathrm{RT}...
Read More →If the magnetic moment of a dioxygen species is
Question: If the magnetic moment of a dioxygen species is $1.73$ B.M, it may be : $\mathrm{O}_{2}^{-}$or $\mathrm{O}_{2}^{+}$$\mathrm{O}_{2}$ or $\mathrm{O}_{2}^{+}$$\mathrm{O}_{2}$ or $\mathrm{O}_{2}^{-}$$\mathrm{O}_{2}, \mathrm{O}_{2}^{-}$or $\mathrm{O}_{2}^{+}$Correct Option: 1 Solution:...
Read More →Solve this following
Question: The $K_{\mathrm{sp}}$ for the following dissociation is $1.6 \times 10^{-5}$ $\mathrm{PbCl}_{2(\mathrm{~s})} \rightleftharpoons \mathrm{Pb}_{(\mathrm{aq})}^{2+}+2 \mathrm{Cl}_{(\mathrm{aq})}^{-}$ Which of the following choices is correct for a mixture of $300 \mathrm{~mL} 0.134 \mathrm{M} \mathrm{Pb}\left(\mathrm{NO}_{3}\right)_{2}$ and $100 \mathrm{~mL} 0.4 \mathrm{M} \mathrm{NaCl}$ ? $\mathrm{Q}\mathrm{K}_{\mathrm{sp}}$$\mathrm{Q}\mathrm{K}_{\mathrm{sp}}$$\mathrm{Q}=\mathrm{K}_{\math...
Read More →According to the following diagram, A reduces
Question: According to the following diagram, A reduces $\mathrm{BO}_{2}$ when the temperature is : $1400^{\circ} \mathrm{C}$$1400^{\circ} \mathrm{C}$$1200^{\circ} \mathrm{C}$$1200^{\circ} \mathrm{C}$ but $1400^{\circ} \mathrm{C}$Correct Option: , 2 Solution: A reduces $\mathrm{BO}_{2}$ when temperature is above $1400^{\circ} \mathrm{C}$ because above $1400^{\circ} \mathrm{C}$ A has more ve $\Delta \mathrm{G}^{\circ}$ for $\mathrm{AO}_{2}$ formation than $\mathrm{B}$ to $\mathrm{BO}_{2}$ formati...
Read More →For the following Assertion and Reason, the correct option is
Question: For the following Assertion and Reason, the correct option is Assertion : For hydrogenation reactions, the catalytic activity increases from Group 5 to Group 11 metals with maximum activity shown by Group 7-9 elements. Reason : The reactants are most strongly adsorbed on group 7-9 elements.Both assertion and reason are true but the reason is not the correct explanation for the assertion.Both assertion and reason are false.Both assertion and reason are true and the reason is the correct...
Read More →Solve this following
Question: ' $\mathrm{X}$ ' melts at low temperature and is a bad conductor of electricity in both liquid and solid state. $\mathrm{X}$ is :Carbon tetrachlorideMercurySilicon carbideZinc sulphideCorrect Option: 1 Solution: $\mathrm{CCl}_{4}$ is molecular solid so does not conduct electricity in liquid \ solid state....
Read More →A chemist has 4 samples of artificial sweetener
Question: A chemist has 4 samples of artificial sweetener A, B, C and D. To identify these samples, he performed certain experiments and noted the following observations : (i) A and D both form blue-violet colour with ninhydrin. (ii) Lassaigne extract of $\mathrm{C}$ gives positive $\mathrm{AgNO}_{3}$ test and negative $\mathrm{Fe}_{4}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]_{3}$ test. (iii)Lassaigne extract of $B$ and $D$ gives positive sodium nitroprusside test Based on these observations whi...
Read More →Preparation of Bakelite proceeds via reactions.
Question: Preparation of Bakelite proceeds via reactions.Condensation and eliminationElectrophilic addition and dehydrationElectrophilic substitution and dehydrationNucleophilic addition and dehydrationCorrect Option: , 3 Solution: Bakelite formation is example of electrophilic substitution and dehydration....
Read More →Hydrogen has three isotopes
Question: Hydrogen has three isotopes $(\mathrm{A}),(\mathrm{B})$ and (C). If the number of neutron(s) in $(A),(B)$ and (C) respectively, are $(x),(y)$ and $(z)$, the sum of $(x)$, (y) an (z) is :4321Correct Option: , 2 Solution:...
Read More →The correct order of heat of combustion for following alkadienes is:
Question: The correct order of heat of combustion for following alkadienes is: $(a)(b)(c)$$(b)(c)(a)$$(c)(b)(a)$$(a)(c)(b)$Correct Option: 1 Solution:...
Read More →The major product in the following reaction is:
Question: The major product in the following reaction is: Correct Option: , 2 Solution:...
Read More →For the following reactions
Question: For the following reactions $\mathrm{A} \stackrel{700 \mathrm{~K}}{\longrightarrow}$ Product $\mathrm{A} \underset{\text { catalyst }}{\stackrel{500 \mathrm{~K}}{\longrightarrow}}$ Product it was found that $E_{a}$ is decreased by $30 \mathrm{~kJ} / \mathrm{mol}$ in the presence of catalyst. If the rate remains unchanged, the activation energy for catalysed reaction is (Assume pre exponential factor is same): $135 \mathrm{~kJ} / \mathrm{mol}$$105 \mathrm{~kJ} / \mathrm{mol}$$198 \mathr...
Read More →Two monomers in maltose are :
Question: Two monomers in maltose are :$\alpha$-D-glucose and $\beta$-D-glucose$\alpha$-D-glucose and $\alpha-\mathrm{D}$-Fructose$\alpha$-D-glucose and $\alpha$-D-glucose$\alpha$-D-glucose and $\alpha$-D-galactoseCorrect Option: , 3 Solution: Two monomers in maltose are $\alpha$-D-glucose \ $\alpha$-D-glucose....
Read More →Among (a) - (d) the complexes that can display
Question: Among (a) - (d) the complexes that can display geometrical isomerism are : (a) $\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{3} \mathrm{Cl}\right]^{+}$ (b) $\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right) \mathrm{Cl}_{5}\right]^{-}$ (c) $\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}\left(\mathrm{NO}_{2}\right)\right]$ (d) $\left[\mathrm{Pt}\left(\mathrm{NH}_{3}\right)_{4} \mathrm{ClBr}\right]^{2+}$(d) and (a)(a) and (b)(b) and (c)(c) and (d)Correct Option: , 4 Solution:...
Read More →Identify (A) in the following reaction sequence :
Question: Identify (A) in the following reaction sequence : Correct Option: , 4 Solution:...
Read More →The radius of the second Bohr orbit,
Question: The radius of the second Bohr orbit, in terms of the Bohr radius, $\mathrm{a}_{0}$, in $\mathrm{Li}^{2+}$ is :$\frac{4 \mathrm{a}_{0}}{9}$$\frac{2 a_{0}}{9}$$\frac{2 \mathrm{a}_{0}}{3}$$\frac{4 \mathrm{a}_{0}}{3}$Correct Option: , 4 Solution:...
Read More →White Phosphorus on reaction with concentrated
Question: White Phosphorus on reaction with concentrated $\mathrm{NaOH}$ solution in an inert atmosphere of $\mathrm{CO}_{2}$ gives phosphine and compound $(\mathrm{X}) .(\mathrm{X})$ on acidification with $\mathrm{HCl}$ gives compound (Y). The basicity of compound (Y) is :4123Correct Option: , 2 Solution:...
Read More →Arrange the following bonds according to their
Question: Arrange the following bonds according to their average bond energies in descending order : $\mathrm{C}-\mathrm{Cl}, \mathrm{C}-\mathrm{Br}, \mathrm{C}-\mathrm{F}, \mathrm{C}-\mathrm{I}$$\mathrm{C}-\mathrm{I}\mathrm{C}-\mathrm{Br}\mathrm{C}-\mathrm{Cl}\mathrm{C}-\mathrm{F}$$\mathrm{C}-\mathrm{Br}\mathrm{C}-\mathrm{I}\mathrm{C}-\mathrm{Cl}\mathrm{C}-\mathrm{F}$$\mathrm{C}-\mathrm{F}\mathrm{C}-\mathrm{Cl}\mathrm{C}-\mathrm{Br}\mathrm{C}-\mathrm{I}$$\mathrm{C}-\mathrm{Cl}\mathrm{C}-\mathrm...
Read More →For the following Assertion and Reason,
Question: For the following Assertion and Reason, the correct option is : Assertion : The $\mathrm{pH}$ of water increases with increase in temperature. Reason : The dissociation of water into $\mathrm{H}^{+}$and $\mathrm{OH}^{-}$is an exothermic reaction.Both assertion and reason are true, but the reason is not the correct explanation for the assertion.Both assertion and reason are false.Assertion is not true, but reason is true.Both assertion and reason are true, and the reason is the correct ...
Read More →Which of the following compounds is likely
Question: Which of the following compounds is likely to show both Frenkel and Schottky defects in its crystalline form?$\mathrm{AgBr}$$\mathrm{ZnS}$$\mathrm{KBr}$$\mathrm{CsCl}$Correct Option: 1 Solution:...
Read More →