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The $pKa$ of a weak acid, $HA$ is $4.80$ . The $pKb$ of a weak base BOH is $4.78$ . The PH of an aqueous solution of the corresponding salt, BA will be

asked Apr 8, 2015 by meena.p

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The correct decreasing order of priority for the functional groups of organic compounds in the IUPAC system of nomenclature is

asked Apr 8, 2015 by meena.p

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A gas expands by $0.5$ liter against a constant pressure of one atmosphere . Calculate the work done in joule.

asked Apr 8, 2015 by meena.p

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What is the ratio between the energies of two radiations one with a wave lebgth of $6000A^{\circ}$ and other with $2000 A^{\circ}$ ?

asked Apr 8, 2015 by meena.p

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What is the ratio between the energies of two radiations one with a wave lebgth of $6000a^{\circ}$ and other with $2000 A^{\circ}$ ?

asked Apr 8, 2015 by meena.p

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The most abundant metal in earth 's trust is

asked Apr 8, 2015 by meena.p

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Calculate the mass of 1.5 gram molecule of sulphuric acid .

asked Apr 8, 2015 by meena.p

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The reaction toluene with chlorine in presence of ferric chloride gives predominately

asked Apr 8, 2015 by meena.p

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The total number of electrons in one molecule of carbon dioxide is :

asked Apr 8, 2015 by meena.p

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In reaction $6NaOH +3cl_2 \to 5 Nacl +A+3 H_2O$ . The oxidation number in 'A' is

asked Apr 8, 2015 by meena.p

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$Zn^{2+}$ dissolves in excess of $NaOH$ due to the formation of :

asked Apr 7, 2015 by meena.p

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Aqueous sodium hydroxide reacts with white phosphorous to form phosphine and

asked Apr 7, 2015 by meena.p

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The total charge required for complete electrolysis is

asked Apr 7, 2015 by meena.p

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Of the following , the metal that cannot be obtained by electrolysis of aqueous solution of their salt are

asked Apr 7, 2015 by meena.p

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The first conization potential of four consecutive elements, present in the second period of the periodic table are $8.3,11.3,14.5$ and $13.6\;ev$ respectively. Which one of the following is the first conization potential (in ev) of nitrogen ?

asked Apr 7, 2015 by meena.p

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The maximum oxidation states shown by $Ru$ and $Os$ , respectively are :

asked Apr 7, 2015 by meena.p

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An aromatic molecule will :

asked Apr 7, 2015 by meena.p

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Two solutions of a substance are mixed in the following manner. $480 \;ml$ of $1.5\;M$ First solution + $520\;ml\;of\;1.2 M$ second solution . What is the molarity of the final mixture?

asked Apr 7, 2015 by meena.p

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The bonds present in $N_2O_5$ are

asked Apr 7, 2015 by meena.p

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Element X is strong electropositive and element Y is strongly electro negative. Both are univalint . The compound formed formed will be

asked Apr 7, 2015 by meena.p

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The chemical formula of feldspar is

asked Apr 7, 2015 by meena.p

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The correct order of stability for the following super oxides is

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An isomer of ethanol is

asked Apr 7, 2015 by meena.p

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The number of isomers of $C_6H_{14}$ is

asked Apr 7, 2015 by meena.p

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The de Broglie wavelengths of electron waves in $3:5$ . The ratio of kinetic energy of electrons will be

asked Apr 7, 2015 by meena.p

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The orbital angular momentum of an electron in 2s orbital is

asked Apr 7, 2015 by meena.p

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The number of radial nodes of 3s and 2 p orbitals are respectively.

asked Apr 7, 2015 by meena.p

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The ratio of radii of first three orbits in hydrogen atom is

asked Apr 6, 2015 by meena.p

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The radius of Bohr's first orbit is $Li^{2t}$ is

asked Apr 6, 2015 by meena.p

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For the vaporization process of HI, the molar entropy and molar enthalpy are respectively $89.0\;jk^{-1}$ and $21.16\;kj\;mol^{-1}$ . The temperature at which the value of $\delta G$ becomes zero for this process is

asked Apr 6, 2015 by meena.p

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The values of four quantum number of valence electron of an element $n=4,l=0,m=0$ and $s= \large\frac{+1}{2}$ . The element is

asked Apr 6, 2015 by meena.p

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The correct order of $\angle FMF$ bond angles in $NSF_3,SiF_4$ and $PoF_3$ is

asked Apr 6, 2015 by meena.p

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For an irreversible reaction $A \to 2B$ , the rate is increased by four times when the concentration of A is doubled. The incorrect statement about this reaction is

asked Apr 6, 2015 by meena.p

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The point $(0,5)$ is closet to the curve $x^2=2y$ at

asked Mar 23, 2015 by meena.p

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A line passes through Point $(2,2)$ and is perpendicular to the line $3x+y=3$ , then its y -intercept is

asked Mar 23, 2015 by meena.p

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The value of $(-1+\sqrt {-3})^{62}$ $+(-1- \sqrt {-3})^{62}$

asked Mar 16, 2015 by meena.p

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The inverse of the function $f(x) =\large\frax{(ax-b)}{(cx-a)}$ $x \neq \large\frac{a}{c}$ is equal to

asked Mar 16, 2015 by meena.p

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If $z= \large\frac{1}{z}$ $=1$ and z be any complex number, then the value of $z^{99} +\frac{1}{z^{99}}$ is

asked Mar 16, 2015 by meena.p

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If the lines $Y=x+1, 2x -3y+5 =0$ and $3x-y+m=0$ are concurrent , then the value of m is

asked Mar 16, 2015 by meena.p

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From $0 < a < x$ , the minimum value of the function $y= \log _a x + \log _a a$ is

asked Mar 16, 2015 by meena.p

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The vertex of the parabola $y= x^2-8x+c$ will be a point on the x-axis , if the value of c is

asked Mar 16, 2015 by meena.p

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$\lim \limits_ {n \to \infty} \bigg[ \large\frac{1}{1+n^3}+ \frac{4}{8+n^3}+.......+\frac{r^2}{(r^2+n^3)}+....+\frac{1}{(2n)}\bigg]$ =

asked Mar 16, 2015 by meena.p

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The value of m for which the scalsr product of the vector $(\overrightarrow{i}+\overrightarrow{j}+\overrightarrow{k}$ with the unit vector parallel to the sum of the vector $2\overrightarrow{i} + 4\overrightarrow{j}+5 \overrightarrow{k})$ and $(m\overrightarrow{i}+2 \overrightarrow{j}+3 \overrightarrow{k})$ ie 1 is equal to

asked Mar 16, 2015 by meena.p

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The coefficient of x in the quadratic equation $ax^2+bx+c=0$ was wrongly taken as 17 in place of 13, and its roots were found to be $-2$ and $-15$ , the actual roots of the equation are

asked Mar 16, 2015 by meena.p

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If the equations $ax^2+bx+c=0$ and $x^2+x+1=0$ have a common root, then

asked Mar 16, 2015 by meena.p

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If $x,y,z$ are three positive real numbers then value of $(x+y) (y+z) (z+x)$ is

asked Mar 16, 2015 by meena.p

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Six points in a plane be joined in all possible ways by indefinite straight lines, and if no two of them be coincident or parallel, and no three passs through the same point. (with the expectation of the original 6). The number of distinct points of intersection is equal to

asked Mar 13, 2015 by meena.p

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The quartile deviation of the items $7,10,12,15,17,17,25$

asked Mar 13, 2015 by meena.p

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If $x^2-3x+2$ is a factor of $x^4-px^2+q=0$ then $P,q$ are

asked Mar 13, 2015 by meena.p

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Coefficient of correlation is

asked Mar 12, 2015 by meena.p

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