12g of a nonvolatile solute dissolved in 108g of water
Question: 12g of a nonvolatile solute dissolved in 108g of water produces the relative lowering of vapour pressure of 0.1. The molecular mass of the solute is :60804020Correct Option: , 4 Solution:...
Read More →Hydrogen peroxide acts both
Question: Hydrogen peroxide acts both as an oxidising and as a reducing agent depending upon the nature of the reacting species. In which of the following cases $\mathrm{H}_{2} \mathrm{O}_{2}$ acts as a reducing agent in acid medium ? :-$\mathrm{MnO}_{4}^{-}$$\mathrm{SO}_{3}^{2-}$KI$\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}$Correct Option: 1 Solution:...
Read More →The reduction potential of hydrogen half-cell will be negative if :-
Question: The reduction potential of hydrogen half-cell will be negative if :-$\mathrm{p}\left(\mathrm{H}_{2}\right)=2 \operatorname{atm}\left[\mathrm{H}^{+}\right]=1.0 \mathrm{M}$$\mathrm{p}\left(\mathrm{H}_{2}\right)=2 \mathrm{~atm}$ and $\left[\mathrm{H}^{+}\right]=2.0 \mathrm{M}$$\mathrm{p}\left(\mathrm{H}_{2}\right)=1 \mathrm{~atm}$ and $\left[\mathrm{H}^{+}\right]=2.0 \mathrm{M}$$\mathrm{p}\left(\mathrm{H}_{2}\right)=1 \mathrm{~atm}$ and $\left[\mathrm{H}^{+}\right]=1.0 \mathrm{M}$Correct ...
Read More →A molecule M associates in a given solvent according to the equation
Question: A molecule $M$ associates in a given solvent according to the equation $M \rightleftharpoons(M)_{n}$. For a certain concentration of M, the van't Hoff factor was found to be $0.9$ and the fraction of associated molecules was $0.2$. The value of $\mathrm{n}$ is : 2453Correct Option: 1 Solution:...
Read More →Which of the following statements
Question: Which of the following statements about $\mathrm{Na}_{2} \mathrm{O}_{2}$ is not correct?$\mathrm{Na}_{2} \mathrm{O}_{2}$ oxidises $\mathrm{Cr}^{3+}$ to $\mathrm{CrO}_{4}^{2-}$ in acid mediumIt is diamagnetic in natureIt is the super oxide of sodiumIt is a derivative of $\mathrm{H}_{2} \mathrm{O}_{2}$Correct Option: , 3 Solution:...
Read More →Resistance of 0.2 M solution of an electrolyte is 50
Question: Resistance of $0.2 \mathrm{M}$ solution of an electrolyte is $50 \Omega$. The specific conductance of the solution is $1.3 \mathrm{~S} \mathrm{~m}^{-1}$. If resistance of the $0.4 \mathrm{M}$ solution of the same electrolyte is $260 \Omega$, its molar conductivity is :-$6250 \mathrm{~S} \mathrm{~m}^{2} \mathrm{~mol}^{-1}$$6.25 \times 10^{-4} \mathrm{~S} \mathrm{~m}^{2} \mathrm{~mol}^{-1}$$625 \times 10^{-4} \mathrm{~S} \mathrm{~m}^{2} \mathrm{~mol}^{-1}$$62.5 \mathrm{~S} \mathrm{~m}^{2...
Read More →In which of the following reaction
Question: In which of the following reaction $\mathrm{H}_{2} \mathrm{O}_{2}$ acts as a reducing agent ? (1) $\mathrm{H}_{2} \mathrm{O}_{2}+2 \mathrm{H}^{+}+2 \mathrm{e}^{-} \rightarrow 2 \mathrm{H}_{2} \mathrm{O}$ (2) $\mathrm{H}_{2} \mathrm{O}_{2}-2 \mathrm{e}^{-} \rightarrow \mathrm{O}_{2}+2 \mathrm{H}^{+}$ (3) $\mathrm{H}_{2} \mathrm{O}_{2}+2 \mathrm{e}^{-} \rightarrow 2 \mathrm{OH}^{-}$ (4) $\mathrm{H}_{2} \mathrm{O}_{2}+2 \mathrm{OH}^{-}-2 \mathrm{e}^{-} \rightarrow \mathrm{O}_{2}+2 \mathrm...
Read More →Vapour pressure of pure benzene is 119 torr and that of toluene is 37.0
Question: Vapour pressure of pure benzene is 119 torr and that of toluene is 37.0 torr at the same temperature. Mole fraction of toluene in vapour phase which is in equilibrium with a solution of benzene and toluene having a mole fraction of toluene 0.50, will be :0.1370.2050.2370.435Correct Option: , 3 Solution:...
Read More →The Gibbs energy for the decomposition of
Question: The Gibbs energy for the decomposition of $\mathrm{Al}_{2} \mathrm{O}_{3}$ at $500{ }^{\circ} \mathrm{C}$ is as follows : $\frac{2}{3} \mathrm{Al}_{2} \mathrm{O}_{3} \longrightarrow \frac{4}{3} \mathrm{Al}+\mathrm{O}_{2}, \Delta_{\mathrm{I}} \mathrm{G}=+966 \mathrm{KJ} \mathrm{mol}^{-1}$ The potential difference needed for electrolytic reduction of $\mathrm{Al}_{2} \mathrm{O}_{3}$ at $500^{\circ} \mathrm{C}$ is at least :-5.0 V4.5 V3.0 V2.5 VCorrect Option: , 4 Solution: $966 \times 10...
Read More →Very pure hydrogen
Question: Very pure hydrogen $(99.9 \%)$ can be made by which of the following processes?Reaction of salt like hydrides with waterReaction of methane with steamMixing natural hydrocarbons of high molecular weightElectrolysis of waterCorrect Option: , 4 Solution:...
Read More →The Gibbs energy for the decomposition of
Question: The Gibbs energy for the decomposition of $\mathrm{Al}_{2} \mathrm{O}_{3}$ at $500{ }^{\circ} \mathrm{C}$ is as follows : $\frac{2}{3} \mathrm{Al}_{2} \mathrm{O}_{3} \longrightarrow \frac{4}{3} \mathrm{Al}+\mathrm{O}_{2}, \Delta_{\mathrm{I}} \mathrm{G}=+966 \mathrm{KJ} \mathrm{mol}^{-1}$ The potential difference needed for electrolytic reduction of $\mathrm{Al}_{2} \mathrm{O}_{3}$ at $500^{\circ} \mathrm{C}$ is at least :-5.0 V4.5 V3.0 V2.5 VCorrect Option: Solution: $966 \times 10^{3}...
Read More →How many grams of methyl alcohol should be added to 10 litre
Question: How many grams of methyl alcohol should be added to 10 litre tank of water to prevent its freezing at 268 K ? $\left(\mathrm{K}_{f}\right.$ for water is $1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$ )899.04 g886.02 g868.06 g880.07 gCorrect Option: , 2 Solution:...
Read More →Given :
Question: Given : $\mathrm{E}_{\mathrm{Fe}^{-3 /} / \mathrm{Fe}}^{\circ}=-0.036 \mathrm{~V}, \mathrm{E}_{\mathrm{Fe}^{\circ 2 /} / \mathrm{Fe}}^{\circ}=-0.439 \mathrm{~V}$. The value of standard electrode potential for the change. $\mathrm{Fe}_{(\mathrm{aq})}^{+3}+\mathrm{e}^{-} \longrightarrow \mathrm{Fe}_{(\text {aq })}^{+2}$ will be :-0.770 V0.27 V0.072 V0.385 VCorrect Option: Solution:...
Read More →The trans-alkenes
Question: The trans-alkenes are formed by the reduction of alkynes with :$\mathrm{NaBH}_{4}$$\mathrm{Na} /$ liq. $\mathrm{NH}_{3}$$\mathrm{Sn}-\mathrm{HCl}$$\mathrm{H}_{2}-\mathrm{Pd} / \mathrm{C}, \mathrm{BaSO}_{4}$Correct Option: , 2 Solution:...
Read More →Solve the following
Question: The freezing point of a $1.00 \mathrm{~m}$ aqueous solution of $\mathrm{HF}$ is found to be $-1.91^{\circ} \mathrm{C}$. The freezing point constant of water, $\mathrm{K}_{\mathrm{f}}$, is $1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$. The percentage dissociation of HF at this concentration is $2.7 \%$$30 \%$$10 \%$$5.2 \%$Correct Option: 1 Solution:...
Read More →Which compound would give
Question: Which compound would give 5 -keto-2-methyl hexanal upon ozonlysis?Correct Option: , 4 Solution:...
Read More →In the presence of peroxide,
Question: In the presence of peroxide, $\mathrm{HC} \ell$ and HI do not give anti-Markownikoff s addition to alkenes becauseAll the steps are exothermic in $\mathrm{HCl}$ and $\mathrm{HI}$One of the steps is endothermic in $\mathrm{HCl}$ and HI$\mathrm{HCl}$ is oxidizing and the HI is reducingBoth $\mathrm{HCl}$ and HI are strong acidsCorrect Option: , 2 Solution: Solution is not required...
Read More →Which of the following statements is false :-
Question: Which of the following statements is false :-$\mathrm{Cr}_{2} \mathrm{O}_{7}^{2-}$ has a $\mathrm{Cr}-\mathrm{O}-\mathrm{Cr}$ bond$\mathrm{CrO}_{4}^{2-}$ is tetrahedral in shape$\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ is a primary standard in volumetry$\mathrm{Na}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$ is less soluble than $\mathrm{K}_{2} \mathrm{Cr}_{2} \mathrm{O}_{7}$Correct Option: , 4 Solution: Solution Not Required...
Read More →The major product obtained
Question: The major product obtained in the photo catalysed bromination of 2 -methylbutane is :-2-bromo-2-methylbutane2-bromo-3-methylbutanel-bromo-2-methylbutanel-bromo-3-methylbutaneCorrect Option: 1 Solution:...
Read More →Liquids A and B form an ideal solution. At
Question: Liquids A and B form an ideal solution. At $30^{\circ} \mathrm{C}$, the total vapour pressure of a solution containing $1 \mathrm{~mol}$ of $\mathrm{A}$ and 2 moles of B is $250 \mathrm{~mm} \mathrm{Hg}$. The total vapour pressure becomes $300 \mathrm{~mm} \mathrm{Hg}$ when 1 more mol of $\mathrm{A}$ is added to the first solution. The vapour pressures of pure $\mathrm{A}$ and $\mathrm{B}$ at the same temperature are [JEE (MAIN)-2012 ONLINE]450, 150 mm Hg250, 300 mm Hg125, 150 mm Hg150...
Read More →Match the catalysts to the correct processes :-
Question: Match the catalysts to the correct processes :- A-ii, B-iii, C-iv, D-iA-iii, B-i, C-ii, D-ivA-iii, B-ii, C-iv, D-iA-ii, B-i, C-iv, D-iiiCorrect Option: Solution: Solution Not Required...
Read More →Solve this
Question: on mercuration- demercuration produces the major product :-Correct Option: 1 Solution:...
Read More →Amongst the following, identify the species with an atom in +6 oxidation state:
Question: Amongst the following, identify the species with an atom in +6 oxidation state:$\left[\mathrm{MnO}_{4}\right]^{-}$$\left[\mathrm{Cr}(\mathrm{CN})_{6}\right]^{3-}$$\mathrm{Cr}_{2} \mathrm{O}_{3}$$\mathrm{CrO}_{2} \mathrm{Cl}_{2}$Correct Option: Solution: Solution Not Required...
Read More →The reagent needed for converting
Question: The reagent needed for converting $\mathrm{H}_{2}$ /Lindlar Cat.Cat. Hydrogenatio$\mathrm{LiAlH}_{4}$$\mathrm{LiNH}_{3}$Correct Option: , 4 Solution: Solution not required...
Read More →A solution containing 0.85 g of
Question: A solution containing $0.85 \mathrm{~g}$ of $\mathrm{ZnCl}_{2}$ in $125.0 \mathrm{~g}$ of water freezes at $-0.23^{\circ} \mathrm{C}$. The apparent degree of dissociation of the salt is : $\left(\mathrm{k}_{f}\right.$ for water $=1.86 \mathrm{~K} \mathrm{~kg} \mathrm{~mol}^{-1}$, atomic mass ; $\mathrm{Zn}=65.3$ and $\left.\mathrm{Cl}=35.5\right)$$1.36 \%$$2.47 \%$$73.5 \%$$7.35 \%$Correct Option: , 3 Solution:...
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