Recent questions in Chemistry

To prepare a buffer of $pH$ 8.26 amount of $(NH_4)_2SO_4$ to be added into 50 mL of 0.01 M $NH_4OH$ solution is [$pK_a (NH_4^+)$ = 9.26]

asked Nov 27, 2013 by mosymeow_1

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Assuming 100% ionization in case of strong electrolytes which of the following will have minimum $pH$?

asked Nov 27, 2013 by mosymeow_1

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$pH$ of $Ca(OH)_2$ solution is 12. Millimoles of ($Ca(OH)_2$) present in 100 mL of solution will be

asked Nov 27, 2013 by mosymeow_1

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Both $HCOOH$ and $CH_3COOH$ solutions have equal $pH$. If $\frac{K_1}{K_2}$ (ratio of acid ionisation constants) of these acids is 4, their molar concentration ratio will be

asked Nov 27, 2013 by mosymeow_1

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For the reaction $S_2O_3^{2-} (aq) + 2H_3O^+ (aq) \rightleftharpoons S (s) + H_2SO_3 (aq) + H_2O(l)$; Rate = $k [H_3O^+][S_2O_3^{2-}]$. Reaction is fastest in

asked Nov 27, 2013 by mosymeow_1

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Which of the following mixtures will act as a buffer solution when dissolved in 50 mL of water?

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Which of the following solutions will have $pH$ of 4.74?

asked Nov 27, 2013 by mosymeow_1

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BOH is a weak base. Molar concentration of BOH provides a [OH^-] of $1.5 \times 10^{-3}$ M is [Given $K_b$ (BOH) = $1.5 \times 10^{-3}$]

asked Nov 27, 2013 by mosymeow_1

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100 mL of $pH$ =6 solution is diluted to 100 mL by water. $pH$ of the solution will increase by

asked Nov 27, 2013 by mosymeow_1

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$pH$ of 0.01 M $(NH_4)_2SO_4$ and 0.02 M $NH_4OH$ buffer ($pK_a$ of $NH_4^+$ = 9.26) is

asked Nov 27, 2013 by mosymeow_1

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A weak base, B has basicity constant, $K_b = 2 \times 10^{-5}$. The $pH$ of any solution in which $[B] = [BH^+]$ is

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$pH$ at which an acidic indicator with $K_{in} = 1 \times 10^{-5}$ changes colour when the indicator is $1 \times 10^{-3}$ M is

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$pH$ of the solution containing 50.0 mL of 0.3 M HCl and 50.0 mL of 0.4 M $NH_3$ is

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$pK_{a1}, pK_{a2}$ and $pK_{a3}$ of $H_3PO_4$ are respectively x, y and z. $pH$ of 0.1 M $Na_2HPO_4$ solution is

asked Nov 27, 2013 by mosymeow_1

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$pK_{a1}$ and $pK_{a2}$ of $H_2CO_3$ are 6.38 and 10.26 respectively. The $pH$ of 1 M and 0.1 M $NaHCO_3$ are

asked Nov 27, 2013 by mosymeow_1

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$pK_b$ of $NH_3$ is 4.74. The $pH$ when 100 mL of 0.01 M $NH_3$ solution is 50% neutralised by 0.01 M HCl is,

asked Nov 27, 2013 by mosymeow_1

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$K_a$ for HCN is $5 \times 10^{-10}$ at $25^\circ C$. How much volume of 5 M KCN solution is required to be added to 10 mL of 2 M HCN in order to maintain $pH$ = 9

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The hydronium ion concentration in pure water is $1 \times 10^{-7}$ mol$L^{-1}$. The degree of dissociation of water is

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The dissociation constant of $H_2S$ and $HS^-$ are respectively $10^{-7}$ and $10^{-13}$. The $pH$ of 0.1 M aqueous solution of $H_2S$ will be

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To 10 mL of aqueous solution some strong acid having $pH$ = 2 is mixed with $pH$ = 4.0. The $pH$ of resulting solution is

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The dissociation constant of certain weak acid HA is $1 \times 10^{-4}$. The equilibrium constant for its reaction with strong base BOH is

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The $pH$ of 0.1 M solution of $NH_4OH$ (having dissociation constant $K_b = 1.0 \times 10^{-5})$ is equal to

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A solution was prepared by dissolving 0.0005 mol of $Ba(OH)_2$ in 100 mL of the solution. If the base is assumed to ionise completely, the $pOH$ of the solution will be

asked Nov 27, 2013 by mosymeow_1

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The $pH$ of a solution is 5.00. To this solution, sufficient acid is added to lower the $pH$ to 2.00. The corresponding increase in $H_3O^+$ ion concentration is

asked Nov 27, 2013 by mosymeow_1

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$M_2SO_4$ ($M^+$ is monovalent metal ion) has a $K_{sp}$ of $3.2 \times 10^{-5}$ at 298 K. The maximum concentration of $SO^{2-}_4$ ion that could be attained in a saturated solution of this solid at 289 K is

asked Nov 27, 2013 by mosymeow_1

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The value of $K^{sp}$ of $HgCl_2$ at room temperature is $4 \times 10^{-15}$. The concentration of $Cl^-$ ion in its aqueous solution at saturation point is

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The dissociation constants of two acids $HA_1$ and $HA_2$ are $3.0 \times 10^{-4}$ and $1.8 \times 10^{-5}$ respectively. The relative strengths of the acids will be

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$Be^{2+}$ is isoelectronic with :

asked Nov 27, 2013 by sreemathi.v

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Which of the following can be used as anaesthetic

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Quartz is a crystalline variety of

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Which one of the following element has highest first ionization potential?

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Which one of the following compounds in aqueous solution gives a white precipitate acid?

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The no of $\pi$ bonds in the product formed by passing acetylene through dil $H_2SO_4$ containing mercuric sulphate

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Select among the following one with largest size

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Hg sticks to surface of glass when it reacts with

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At a certain temperature, dissociation constant of formic acid and acetic acid are $1.8 \times 10^{-4}$ and $1.8 \times 10^{-5}$ respectively. At what concentration of acetic solution, the $H_3O^+$ ion concentration is same as that in 0.001 M fromic acid solution

asked Nov 27, 2013 by mosymeow_1

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The dissociation constants of four monobasic acids HA, HX, HY and HD are respectively $6 \times 10^{-4}, 5 \times 10^{-5}, 3.6 \times 10^{-6}, 7 \times 10^{-10}$. The $pH$ values of their 0.1 M aqueous solutions is

asked Nov 27, 2013 by mosymeow_1

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Bleaching action of $SO_2$ is due to

asked Nov 27, 2013 by sreemathi.v

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Three sparingly solube salts $M_2V, MX and MX_3$ have same value of solubility product. Their solubilities follow the order

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If $K_1$ and $K_2$ are respective equilibrium constants of two reactions: $XeF_6 (g) + H_2O(g) \rightleftharpoons XeOF_4 (g) + 2HF(g)$ and $XeO_4 (g) + XeF_6(g) \rightleftharpoons XeOF_4 (g) + 2XeO_3F_2(g)$ Then equilibrium constant for the reaction $XeO_4(g) + 2HF(g) \rightleftharpoons XeO_3F_2(g) + H_2O(g)$ will be

asked Nov 27, 2013 by mosymeow_1

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The $pH$ of a dilute solution of acetic acid was found to be 4.3. The addition of a small crystal of sodium acetate will cause $pH$ to

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$\rho H$ of water is 7.0 at 298 K. If water is heated to 350 K, which of the following should be true?

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A solution is obtained by mixing two solutions of same electrolyte with pH = 5 and pH = 3 respectively. The resulting solution has pH

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The inert form of carbon is

asked Nov 27, 2013 by sreemathi.v

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The element that can exhibit highest number of oxidation state

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The state of hybridization of Boron in $BCl_3$

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Refer the below Table :

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$Ca(OH)_2+Cl_2\rightarrow CaOCl_2+H_2O$.This reaction can be used in

asked Nov 27, 2013 by sreemathi.v

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What are the shapes & hybridization of $SO_2$ & $SO_3$

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$NCl_3+H_2O\rightarrow NH_3+x,PCl_3+3H_2O\rightarrow H_3PO_3+y$.The $x$ and $y$ are :-

asked Nov 27, 2013 by sreemathi.v

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