How many litres of water must be added to
Question: How many litres of water must be added to 1 litre of an aqueous solution of $\mathrm{HCl}$ with a pH of 1 to create an aqueous solution with $\mathrm{pH}$ of 2 ?$0.1 \mathrm{~L}$$0.9 \mathrm{~L}$$2.0 \mathrm{~L}$$9.0 \mathrm{~L}$Correct Option: 4, Solution:...
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Question: Given Cr$\mathrm{Mn}^{2+}$$\mathrm{Cr}^{3+}$$\mathrm{Cl}^{-}$Correct Option: 1 Solution:...
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Question: If $\mathrm{K}_{\mathrm{sp}}$ of $\mathrm{CaF}_{2}$ at $25^{\circ} \mathrm{C}$ is $1.7 \times 10^{-10}$, the combination amongst the following which gives a precipitate of $\mathrm{CaF}_{2}$ is :-$1 \times 10^{-2} \mathrm{M} \mathrm{Ca}^{2+}$ and $1 \times 10^{-5} \mathrm{M} \mathrm{F}$$1 \times 10^{-4} \mathrm{M} \mathrm{Ca}^{2+}$ and $1 \times 10^{-4} \mathrm{M} \mathrm{F}^{-}$$1 \times 10^{-3} \mathrm{M} \mathrm{Ca}^{2+}$ and $1 \times 10^{-5} \mathrm{M} \mathrm{F}^{-}$$1 \times 10^...
Read More →A solution at 20°C is composed of 1.5 mol of benzene and 3.5 mol
Question: A solution at $20^{\circ} \mathrm{C}$ is composed of $1.5 \mathrm{~mol}$ of benzene and $3.5 \mathrm{~mol}$ of toluene. If the vapour pressure of pure benzene and pure toluene at this temperature are $74.7$ torr and $22.3$ torr, respectively, then the total vapour pressure of the solution and the benzene mole fraction in equilibrium with it will be, respectively : 38.0 torr and 0.58930.5 torr and 0.38935.8 torr and 0.28035.0 torr and 0.480Correct Option: 1 Solution:...
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Question: The $\mathrm{pH}$ of a $0.1$ molar solution of the acid $\mathrm{HQ}$ is 3 . The value of the ionization constant, $\mathrm{K}_{\mathrm{a}}$ of this acid is :-$1 \times 10^{-7}$$3 \times 10^{-7}$$1 \times 10^{-3}$$1 \times 10^{-5}$Correct Option: , 4 Solution:...
Read More →Galvanization is applying a coating of :-
Question: Galvanization is applying a coating of :-ZnPbCrCuCorrect Option: 1 Solution: Galvanization is the process of applying a protective zinc coating of steel or iron, to prevent rusting....
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Question: The $\mathrm{K}_{\mathrm{sp}}$ for $\mathrm{Cr}(\mathrm{OH})_{3}$ is $1.6 \times 10^{-30}$. The molar solubility of this compound in water is :-$\sqrt[2]{1.6 \times 10^{-30}}$$\sqrt[4]{1.6 \times 10^{-30}}$$\sqrt[4]{1.6 \times 10^{-30} / 27}$$1.6 \times 10^{-30} / 27$Correct Option: , 3 Solution:...
Read More →Determination of the molar mass of acetic acid in benzene
Question: Determination of the molar mass of acetic acid in benzene using freezing point depression is affected by :associationdissociationcomplex formationpartial ionizationCorrect Option: 1 Solution: Acetic acid in non polar solvent (benzene) associates....
Read More →Two Faraday of electricity is passed through a solution of
Question: Two Faraday of electricity is passed through a solution of $\mathrm{CuSO}_{4}$. The mass of copper deposited at the cathode is : (at. mass of $\mathrm{Cu}=63.5 \mathrm{amu}$ ) 2g127 g0 g63.5 gCorrect Option: , 4 Solution:...
Read More →An acid HA ionises as
Question: An acid HA ionises as $\mathrm{HA} \rightleftharpoons \mathrm{H}^{+}+\mathrm{A}^{-}$ The $\mathrm{pH}$ of $1.0 \mathrm{M}$ solution is 5 . Its dissociation constant would be :-$1 \times 10^{-10}$5$5 \times 10^{-8}$$1 \times 10-5$Correct Option: 1 Solution:...
Read More →Consider separate solution of 0.500 M
Question: Consider separate solution of $0.500 \mathrm{M} \mathrm{C}_{2} \mathrm{H}_{5} \mathrm{OH}(\mathrm{aq}), 0.100 \mathrm{M} \mathrm{Mg}_{3}\left(\mathrm{PO}_{4}\right)_{2}(\mathrm{aq}), 0.250 \mathrm{M} \mathrm{KBr}(\mathrm{aq})$ and $0.125 \mathrm{M} \mathrm{Na}_{3} \mathrm{PO}_{4}(\mathrm{aq})$ at $25^{\circ} \mathrm{C}$. Which statement is true about these solutions, assuming all salts to be strong electrolytes ? $0.125 \mathrm{M} \mathrm{Na}_{3} \mathrm{PO}_{4}(\mathrm{aq})$ has the h...
Read More →Solubility product of silver bromide
Question: Solubility product of silver bromide is $5.0 \times 10^{-13}$. The quantity of potassium bromide (molar mass taken as $120 \mathrm{~g} \mathrm{~mol}^{-1}$ ) to be added to 1 litre of $0.05 \mathrm{M}$ solution of silver nitrate to start the precipitation of $\mathrm{AgBr}$ is :-$5.0 \times 10^{-8} \mathrm{~g}$$1.2 \times 10^{-10} \mathrm{~g}$$1.2 \times 10^{-9} \mathrm{~g}$$6.2 \times 10^{-5} \mathrm{~g}$Correct Option: , 3 Solution:...
Read More →A variable, opposite external potential
Question: A variable, opposite external potential $\left(\mathrm{E}_{\text {ext }}\right)$ is applied to the cell $\mathrm{Zn}\left|\mathrm{Zn}^{2+}(1 \mathrm{M}) \| \mathrm{Cu}^{2+}(1 \mathrm{M})\right| \mathrm{Cu}$, of potential $1.1 \mathrm{~V} .$ When $\mathrm{E}_{\mathrm{ext}}1.1 \mathrm{~V}$ and $\mathrm{E}_{\mathrm{ext}}1.1 \mathrm{~V}$ respectively electrons flow from :anode to cathode in both casesanode to cathode and cathode to anodecathode to anode in both casescathode to anode and an...
Read More →In aqueous solution the ionization
Question: In aqueous solution the ionization constants for carbonic acid are $\mathrm{K}_{1}=4.2 \times 10^{-7}$ and $\mathrm{K}_{2}=4.8 \times 10^{-11}$ Select the correct statement for a saturated $0.034 \mathrm{M}$ solution of the carbonic acid :-The concentration of $\mathrm{H}^{+}$is double that of $\mathrm{CO}_{3}{ }^{2-}$The concentration of $\mathrm{CO}_{3}{ }^{2-}$ is $0.034 \mathrm{M}$The concentration of $\mathrm{CO}_{3}^{2-}$ is greater than that of $\mathrm{HCO}_{3}^{-}$The concentr...
Read More →For an ideal Solution of two components A and B,
Question: For an ideal Solution of two components A and B, which of the following is true ?$\Delta \mathrm{H}_{\text {mixing }}0$ (zero)A A, B B and A B interactions are identicalA B interaction is stronger than A A and B B interactions$\Delta \mathrm{H}_{\text {mixing }}0($ zero $)$Correct Option: , 2 Solution:...
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Question: At $298 \mathrm{~K}$, the standard reduction potentials are $1.51 \mathrm{~V}$ for $\mathrm{MnO}_{4}^{-} \mid \mathrm{Mn}^{2+}, 1.36 \mathrm{~V}$ for $\operatorname{oxidize}\left(\frac{\mathrm{RT}}{\mathrm{F}}=0.059 \mathrm{~V}\right):-$$\mathrm{Cl}^{-}$and $\mathrm{Br}^{-}$$\mathrm{Cl}^{-}, \mathrm{Br}^{-}$and $\mathrm{I}^{-}$$\mathrm{Br}^{-}$and $\mathrm{I}^{-}$I' $^{-}$onlyCorrect Option: Solution:...
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Question: At $25^{\circ} \mathrm{C}$, the solubility producct of $\mathrm{Mg}(\mathrm{OH})_{2}$ is $1.0 \times 10^{-11}$. At which pH, will $\mathrm{Mg}^{2+}$ ions start precipitating in the form of $\mathrm{Mg}(\mathrm{OH})_{2}$ from a solution of $0.001 \mathrm{M} \mathrm{Mg}^{2+}$ ions ?891011Correct Option: , 3 Solution:...
Read More →The equivalent conductance of
Question: The equivalent conductance of $\mathrm{NaCl}$ at concentration $\mathrm{C}$ and at infinite dilution are $\lambda_{\mathrm{C}}$ and $\lambda_{\infty}$, respectively. The correct relationship between $\lambda_{C}$ and $\lambda_{\infty}$ is given as: (where the constant B is postive)$\lambda_{\mathrm{C}}=\lambda_{\infty}-(\mathrm{B}) \sqrt{\mathrm{C}}$$\lambda_{\mathrm{C}}=\lambda_{\infty}+(\mathrm{B}) \sqrt{\mathrm{C}}$$\lambda_{\mathrm{C}}=\lambda_{\infty}+(\mathrm{B}) \mathrm{C}$$\lam...
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Question: Solid Ba(NO $)_{3}$ is gradully dissolved in a $1.0 \times 10^{-4} \mathrm{M} \mathrm{Na}_{2} \mathrm{CO}_{3}$ solution. At what concentration of $\mathrm{Ba}^{2+}$ will a precipitate begin to form? $\left(\mathrm{K}_{\mathrm{SP}}\right.$ for $\left.\mathrm{Ba} \mathrm{CO}_{3}=5.1 \times 10^{-9}\right)$$8.1 \times 10^{-8} \mathrm{M}$$8.1 \times 10^{-7} \mathrm{M}$$4.1 \times 10^{-5} \mathrm{M}$$5.1 \times 10^{-5} \mathrm{M}$Correct Option: , 4 Solution:...
Read More →The observed osmotic pressure for a 0.10 M solution of
Question: The observed osmotic pressure for a $0.10 \mathrm{M}$ solution of $\mathrm{Fe}\left(\mathrm{NH}_{4}\right)_{2}\left(\mathrm{SO}_{4}\right)_{2}$ at $25^{\circ} \mathrm{C}$ is $10.8$ atm. The expected and experimental (observed) values of Van't Hoff factor (i) will be respectively $:\left(\mathrm{R}=0.082 \mathrm{~L}\right.$ atm $\left.\mathrm{k}^{-} \mathrm{mol}^{-1}\right)$ 3 and 5.425 and 3.424 and 4.005 and 4.42Correct Option: , 4 Solution:...
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Question: Given : Based on the data given above, strongest oxidising agent will be :Cl$\mathrm{Cr}^{3+}$$\mathrm{Mn}^{2+}$$\mathrm{MnO}_{4}^{-}$Correct Option: , 4 Solution:...
Read More →The molarity of a solution obtained by mixing 750 mL of 0.5
Question: The molarity of a solution obtained by mixing 750 mL of 0.5(M)HCl with 250 mL of 2(M)HCl will be :-0.875 M1.00 M1.75 M0.975 MCorrect Option: 1 Solution:...
Read More →From the following statements
Question: From the following statements regarding $\mathrm{H}_{2} \mathrm{O}_{2}$, choose the incorrect statement :It has to be stored in plastic or wax lined glass bottles in darkIt has to be kept away from dustIt can act only as an oxidizing agentIt decomposes on exposure to lightCorrect Option: , 3 Solution:...
Read More →The standard reduction potentials for
Question: The standard reduction potentials for $\mathrm{Zn}^{2+} / \mathrm{Zn}, \mathrm{Ni}^{2+} / \mathrm{Ni}$ and $\mathrm{Fe}^{2+} / \mathrm{Fe}$ are $-0.76,-0.23$ and $-0.44 \mathrm{~V}$ respectively. The reaction $\mathrm{X}+\mathrm{Y}^{+2} \rightarrow \mathrm{X}^{2+}+\mathrm{Y}$ will be spontaneous whenX = Zn, Y = NiX = Ni, Y = FeX = Ni, Y = ZnX = Fe, Y = ZnCorrect Option: 1 Solution: For spontaneous reaction $\mathrm{E}^{\circ}0$ so (A)...
Read More →Permanent hardness in water cannot be cured by:
Question: Permanent hardness in water cannot be cured by:Treatment with washing sodaCalgon's methodBoilingIon exchange methodCorrect Option: , 3 Solution:...
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