A aqueous solution contains an
Question: A aqueous solution contains an unknown concentration of $\mathrm{Ba}^{2+}$. When $50 \mathrm{~mL}$ of a $1 \mathrm{M}$ solution of $\mathrm{Na}_{2} \mathrm{SO}_{4}$ is added, $\mathrm{BaSO}_{4}$ just begins to precipitate. The final volume is $500 \mathrm{~mL}$. The solubility product of $\mathrm{BaSO}_{4}$ is $1 \times 10^{-10}$. What is the original concentration of $\mathrm{Ba}^{2+}$ ?$2 \times 10^{-9} \mathrm{M}$$1.1 \times 10^{-9} \mathrm{M}$$1.0 \times 10^{-10} \mathrm{M}$$5 \tim...
Read More →The metal that cannot be obtained by electrolysis of an aqueous
Question: The metal that cannot be obtained by electrolysis of an aqueous solution of its salts is :CuCrAgCaCorrect Option: , 4 Solution:...
Read More →An aqueous solution contains
Question: An aqueous solution contains $0.10 \mathrm{M} \mathrm{H}_{2} \mathrm{~S}$ and $0.20 \mathrm{M} \mathrm{HCl}$. If the equilibrium constants for the formation of $\mathrm{HS}^{-}$from $\mathrm{H}_{2} \mathrm{~S}$ is $1.0 \times 10^{-7}$ and that of $\mathrm{S}^{2-}$ from $\mathrm{HS}^{-}$ions is $1.2 \times 10^{-13}$ then the concentration of $S^{2-}$ ions in aqueous solution is :$3 \times 10^{-20}$$6 \times 10^{-21}$$5 \times 10^{-19}$$5 \times 10^{-8}$Correct Option: 1 Solution:...
Read More →Solve this
Question: $\mathrm{pK}_{\mathrm{a}}$ of a weak acid (HA) and $\mathrm{pK}_{\mathrm{b}}$ of a weak base $(\mathrm{BOH})$ are $3.2$ and $3.4$, respectively. The $\mathrm{pH}$ of their salt $(A B)$ solution is$7.2$$6.9$$7.0$$1.0$Correct Option: , 2 Solution:...
Read More →Calcination is the process in which :
Question: Calcination is the process in which :Ore is heated strongly below its melting point in the presence of excess of ait and is used for the conversion of carbonates and hydrated oxide ores to their respective oxides.Ore is heated strongly below its melting point in the absence or limited supply of air and is used for conversion of sulphide ores to their respective oxidesOre is heated strongly below its melting point either in the limited or absence of air and is used to convert carbonates...
Read More →For a linear plot of log(x/m) versus log p in a Freundlich adsorption isotherm,
Question: For a linear plot of log(x/m) versus log p in a Freundlich adsorption isotherm, which of the following statements is correct ? (k and n are constants)log (1/n) appears as the interceptBoth k and 1/n appear in the slope term1/n appears as the interceptOnly 1/n appears as the slopeCorrect Option: , 4 Solution:...
Read More →In some solutions,
Question: In some solutions, the concentration of $\mathrm{H}_{3} \mathrm{O}^{+}$remains constant even when small amounts of strong acid or strong base are added to them. These solutions are known as :-Colloidal solutionsTrue solutionsIdeal solutionsBuffer solutionsCorrect Option: , 4 Solution: Fact...
Read More →The Tyndall effect is observed only when following conditions are satisfied :-
Question: The Tyndall effect is observed only when following conditions are satisfied :- (a) The diameter of the dispersed particles is much smaller than the wavelength of the ligh used. (b) The diameter of the dispersed particle is not much smaller than the wavelength of the light used. (c) The refractive indices of the dispersed phase and dispersion medium are almost similar in magnitude. (d) The refractive indices of the dispersed phase and dispersion medium differ greatly in magnitude.(a) an...
Read More →Consider the following reaction:
Question: Consider the following reaction: $\mathrm{xMnO}_{4}^{-}+\mathrm{yC}_{2} \mathrm{O}_{4}^{2-}+\mathrm{zH}^{+} \rightarrow$ $\mathrm{xMn}^{2+}+2 \mathrm{yCO}_{2}+\frac{\mathrm{z}}{2} \mathrm{H}_{2} \mathrm{O}$ The values of $x, y$ and $z$ in the reaction are respectively :- 5,2 and 162,5 and 82,5 and 165,2 and 8Correct Option: , 3 Solution: Solution Not Required...
Read More →In Goldschmidt alumino thermic process which of the following
Question: In Goldschmidt alumino thermic process which of the following reducing agents is used :CalciumCokeSodiumAl-powderCorrect Option: , 4 Solution: In alumino thermic process 'Al' metal is used as reducing agent....
Read More →Zirconium phosphate
Question: Zirconium phosphate $\left[\mathrm{Zr}_{3}\left(\mathrm{PO}_{4}\right)_{4}\right]$ dissociates into three zirconium cations of charge $+4$ and four phosphate anions of charge $-3$. If molar solubility of zirconium phosphate is denoted by $S$ and its solubility product by $\mathrm{K}_{\mathrm{sp}}$ then which of the following relationship between $\mathrm{S}$ and $\mathrm{K}_{\mathrm{sp}}$ is correct ?$\mathrm{S}=\left\{\mathrm{K}_{\mathrm{sp}} / 144\right\}^{1 / 7}$$\mathrm{S}=\left\{\...
Read More →Which of the oxide groups among the following
Question: Which of the oxide groups among the following cannot be reduced by carbon :-$\mathrm{Fe}_{2} \mathrm{O}_{3}, \mathrm{ZnO}$$\mathrm{PbO}, \mathrm{Fe}_{2} \mathrm{O}_{4}$$\mathrm{Cu}_{2} \mathrm{O}, \mathrm{SnO}_{2}$$\mathrm{CaO}, \mathrm{K}_{2} \mathrm{O}$Correct Option: , 4 Solution: More reactive metal such as K and "Ca" etc. can be used by electrolytic reduction method but not by carbon reduction method....
Read More →For a linear plot of log(x/m) versus log p in a Freundlich adsorption isotherm,
Question: For a linear plot of log(x/m) versus log p in a Freundlich adsorption isotherm, which of the following statements is correct ? (k and n are constants)log (1/n) appears as the interceptBoth k and 1/n appear in the slope term1/n appears as the interceptOnly 1/n appears as the slopeCorrect Option: , 4 Solution: According to Freundlich isotherm...
Read More →The coagulating power of electrolytes having ions
Question: The coagulating power of electrolytes having ions $\mathrm{Na}^{+}, \mathrm{Al}^{3+}$ and $\mathrm{Ba}^{2+}$ for aresenic sulphide sol increases in the order :-$\mathrm{Al}^{3+}\mathrm{Ba}^{2+}\mathrm{Na}^{+}$$\mathrm{Na}^{+}\mathrm{Ba}^{2+}\mathrm{Al}^{3+}$$\mathrm{Ba}^{2+}\mathrm{Na}^{+}\mathrm{Al}^{3+}$$\mathrm{Al}^{3+}\mathrm{Na}^{+}\mathrm{Ba}^{2+}$Correct Option: Solution: According to hardley schuzle rule...
Read More →The substance used as froth stabilisers in froth-floatation process is :
Question: The substance used as froth stabilisers in froth-floatation process is :Copper sulphateAnilineSodium cyanidePotassium ethyl xanthateCorrect Option: Solution: Aniline is used to stablises the forth....
Read More →According to Freundlich adsorption isotherm, which of the following is correct ?
Question: According to Freundlich adsorption isotherm, which of the following is correct ?$\frac{x}{m} \propto p^{0}$$\frac{x}{m} \propto p^{1}$$\frac{x}{m} \propto p^{1 / n}$All the above are correct for different ranges of pressureCorrect Option: , 4 Solution:...
Read More →Which method of purification is represented by the following equation
Question: Which method of purification is represented by the following equation : $\mathrm{Ti}(\mathrm{s})+2 \mathrm{I}_{2}(\mathrm{~g}) \stackrel{\mathrm{s} 23 \mathrm{~K}}{\longrightarrow} \mathrm{TiI}_{4}(\mathrm{~g}) \stackrel{1700 \mathrm{~K}}{\longrightarrow} \mathrm{Ti}(\mathrm{s})+2 \mathrm{I}_{2}(\mathrm{~g})$Van ArkelZone refiningCupellationPolingCorrect Option: 1 Solution: Ti,Zr,Hg etc can be purified by Van Arkel's process....
Read More →Which method of purification is represented by the following equation
Question: Which method of purification is represented by the following equation : $$ \mathrm{Ti}(\mathrm{s})+2 \mathrm{I}_{2}(\mathrm{~g}) \stackrel{\mathrm{s} 23 \mathrm{~K}}{\longrightarrow} \mathrm{TiI}_{4}(\mathrm{~g}) \stackrel{1700 \mathrm{~K}}{\longrightarrow} \mathrm{Ti}(\mathrm{s})+2 \mathrm{I}_{2}(\mathrm{~g}) $$Van ArkelZone refiningCupellationPolingCorrect Option: 1 Solution: Ti,Zr,Hg etc can be purified by Van Arkel's process....
Read More →Which of the following statements is incorrect regarding physisorptions ?
Question: Which of the following statements is incorrect regarding physisorptions ?Under high pressure it results into multi molecular layer on adsorbent surfaceEnthalpy of adsorption $\left(\Delta \mathrm{H}_{\text {adsorption }}\right)$ is low and positiveIt occurs because of Van der Waal's forcesMore easily liquefiable gases are adsorbed readilyCorrect Option: , 2 Solution: $\Delta \mathrm{H}$ is negative...
Read More →Solve this
Question: $\mathrm{NaOH}$ is a strong base. What will be pH of $5.0 \times 10^{-2} \mathrm{M} \mathrm{NaOH}$ solution ? $(\log 2=0.3)$$13.70$$13.00$$14.00$$12.70$Correct Option: , 4 Solution:...
Read More →Which one of the following arrangements
Question: Which one of the following arrangements represents the correct order of solubilities of sparingly soluble salts $\mathrm{Hg}_{2} \mathrm{Cl}_{2}, \mathrm{Cr}_{2}\left(\mathrm{SO}_{4}\right)_{3}, \mathrm{BaSO}_{4}$ and $\mathrm{CrCl}_{3}$ respectively ?$\left(\frac{\mathrm{K}_{\mathrm{sp}}}{4}\right)^{\frac{1}{3}},\left(\frac{\mathrm{K}_{\mathrm{sp}}}{108}\right)^{\frac{1}{3}},\left(\mathrm{~K}_{\mathrm{sp}}\right)^{\frac{1}{2}},\left(\frac{\mathrm{K}_{\mathrm{sp}}}{27}\right)^{\frac{1}...
Read More →For 1 molal aqueous solution of the following compounds,
Question: For 1 molal aqueous solution of the following compounds, which one will show the highest freezing point ?$\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{5} \mathrm{Cl}\right] \mathrm{Cl}_{2} \cdot \mathrm{H}_{2} \mathrm{O}$$\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{4} \mathrm{Cl}_{2}\right] \mathrm{Cl} \cdot 2 \mathrm{H}_{2} \mathrm{O}$$\left[\mathrm{Co}\left(\mathrm{H}_{2} \mathrm{O}\right)_{3} \mathrm{Cl}_{3}\right] .3 \mathrm{H}_{2} \mathrm{O}$$\left[\mathrm...
Read More →What would be the
Question: What would be the $\mathrm{pH}$ of a solution obtained by mixing $5 \mathrm{~g}$ of acetic acid and $7.5 \mathrm{~g}$ of sodium acetate and making the volume equal to $500 \mathrm{~mL}$ ?$4.76\mathrm{pH}5.0$$\mathrm{pH}4.70$$\mathrm{pH}$ of solution will be equal to $\mathrm{pH}$ of acetic acid$\mathrm{pH}=4.70$Correct Option: 1 Solution:...
Read More →How long (approximate) should water be electrolysed by passing through 100 amperes current so
Question: How long (approximate) should water be electrolysed by passing through 100 amperes current so that the oxygen released can completely burn 27.66 g of diborane ? (Atomic weight of B = 10.8 u)0.8 hours3.2 hours1.6 hours6.4 hoursCorrect Option: , 2 Solution:...
Read More →The vapour pressure of acetone at 20°C is 185 torr
Question: The vapour pressure of acetone at $20^{\circ} \mathrm{C}$ is $185 \mathrm{torr}$. When $1.2 \mathrm{~g}$ of non-volatile substance was dissolved in $100 \mathrm{~g}$ of acetone at $20^{\circ} \mathrm{C}$, its vapour pressure was $183 \mathrm{torr}$. The molar mass ( $\mathrm{g} \mathrm{mol}^{-}$ 1) of the substance is : 1284883264Correct Option: Solution:...
Read More →