Recent questions tagged medium

If freezing point of 0.1 M aqueous weak monobasic acid is $-0.2046^\circ C$, then $pH$ of solution is [$K_f (H_2O) = 1.86 kg mol^{-1}$]

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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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?

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

asked Nov 27, 2013 by mosymeow_1

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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

asked Nov 27, 2013 by mosymeow_1

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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

asked Nov 27, 2013 by mosymeow_1

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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

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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Two persons of equal height are carrying a long wooden beam of length l. They are at a distance $\frac{l}{4}$ and $\frac{l}{6}$ from the nearest end of the rod. The ratio of the normal reactions at their heads i s

asked Nov 27, 2013 by meena.p

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A uniform rod of mass m and length L is suspended with two massless strings as shown. If the rod is at rest in a horizontal position, the ratio of the tensions in the two strings?

asked Nov 27, 2013 by meena.p

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A light rod of length 1 m is pivoted at its centre and two masses 5 kg and 2 kg are hung from the ends as shown. In the above question if the rod has a mass 1 kg, then its initial angular acceleration

asked Nov 27, 2013 by meena.p

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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

asked Nov 27, 2013 by sreemathi.v

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Quartz is a crystalline variety of

asked Nov 27, 2013 by sreemathi.v

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

asked Nov 27, 2013 by sreemathi.v

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

asked Nov 27, 2013 by sreemathi.v

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

asked Nov 27, 2013 by sreemathi.v

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Select among the following one with largest size

asked Nov 27, 2013 by sreemathi.v

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Hg sticks to surface of glass when it reacts with

asked Nov 27, 2013 by sreemathi.v

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A light rod of length 1 m is pivoted at its centre and two masses 5 kg and 2 kg are hung from the ends as shown. The critical angular acceleration of the rod if it is assumed to be massless is?

asked Nov 27, 2013 by meena.p

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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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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

asked Nov 27, 2013 by mosymeow_1

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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?

asked Nov 27, 2013 by mosymeow_1

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A uniform rod of length l is free to rotate in a vertical plane about a fixed horizontal axis through 0. The rod is allowed to rotate from its unstable vertical position. Then the angular velocity of the rod when it has turned through an angle $\theta$ is

asked Nov 27, 2013 by meena.p

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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

asked Nov 27, 2013 by mosymeow_1

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The inert form of carbon is

asked Nov 27, 2013 by sreemathi.v

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Acceleration of block $m_1$ is (given moment of inertia of pulley is I and string does not slip over the pulley )

asked Nov 27, 2013 by meena.p

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A uniform rod of mass 20 kg and length 1.6 m is pivoted at its end and swings in the vertical plane. Angular acceleration of the rod just after the rod is released from rest in the horizontal position

asked Nov 27, 2013 by meena.p

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The element that can exhibit highest number of oxidation state

asked Nov 27, 2013 by sreemathi.v

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One end of a long uniform rod of mass m and length l is clamped. The rod lies on a smooth horizontal surface and rotates on it about the clamped end with a uniform angular velocity w. The force exerted by the clamp on the rod has a horizontal component.

asked Nov 27, 2013 by meena.p

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A uniform solid cylinder of mass M and radius R rotates about a frictionless axle. Two masses are suspended from a rope wrapped around the cylinder. If the system is released from rest, the tension in each rope is

asked Nov 27, 2013 by meena.p

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A cylinder of mass M and radius R is fixed on a frictionless axle over a well. A rope of negotiable mass is wrapped around the cylinder . A bucket of mass m is suspended from it. The linear acceleration of the bucket will be

asked Nov 27, 2013 by meena.p

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Refer the below Table :

asked Nov 27, 2013 by sreemathi.v

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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 $SO_2$ & $SO_3$

asked Nov 27, 2013 by sreemathi.v

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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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Two particles of masses $m_1$ and $m_2$ are connected to a rigid massless rod of length r to constitute a dumb bell which is free to move in the plane. The moment of inertia of the dumb bell about an axis perpendicular to the plane passing through the centre of mass

asked Nov 26, 2013 by meena.p

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Four spheres of diameter 2a and mass M are placed with their centres on the four corners of a square of side b. Then the moment of inertia of the system about an axis along one of the sides of the square is

asked Nov 26, 2013 by meena.p

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A thin wire of length l and mass m is bent in the form of a semicircle as shown. Its moment of inertia about an axis joining its free ends will be

asked Nov 26, 2013 by meena.p

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From a disc of mass M and radius R, a smaller disc of radius $\large\frac{R}{2}$ is cut out as shown. The moment of inertia of the remaining portion about an axis through the centre 0 and perpendicular to the plane of the disc is

asked Nov 26, 2013 by meena.p

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Moment of inertia of a semicircular ring about an axis perpendicular to its plane and passing through its centre of mass. (mass M,Radius R)

asked Nov 26, 2013 by meena.p

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