Recent questions in Chemistry

The concentration of oxalic acid is $'x' molL^{-1}$ . 40 mL of this solution reacts with 16 mL of 0.05 M acidified $KMnO_4$ . What is the pH of 'x' M oxalic acid solution ? (Assume that oxalic acid dissociate completely)

asked Oct 30, 2013 by meena.p

1 answer

The rate constant of a first order reaction at $27^{\circ}$ is $10^{-3} \min ^{-1})$ . The temperature coefficient of this reaction is 2. What is the rate constant $(in min^{-1})$ at $17^{\circ}C$ for this reaction ?

asked Oct 30, 2013 by meena.p

1 answer

Which of the following is not a characteristic property of chemical equilibrium?

asked Oct 30, 2013 by meena.p

1 answer

Which of the following set of variables give a straight line with a negative slope when plotted? (P= vapour pressure. T= Temperature in K)

asked Oct 30, 2013 by meena.p

1 answer

$AB$ is an ionic solid. The ionic radii of $A^{+}$ and $B^{-}$ are respectively $r_c$ and $r_a$ . Lattice energy of AB is proportional to :

asked Oct 30, 2013 by meena.p

1 answer

Electronlysis of X gives Y at anode. Vacuum distillation of Y gives $H_2O_2$ . The number of peroxy (O-O) bonds present in X and Y respectively are :

asked Oct 30, 2013 by meena.p

1 answer

The disperse phase, dispersion medium and nature of colloidal solution (lyophilic or lyophobic) of 'gold sol' respectively are :

asked Oct 30, 2013 by meena.p

1 answer

$CFCl_3$ is responsible for the decomposition of ozone to oxygen. Which of the following reacts with ozone to from oxygen?

asked Oct 30, 2013 by meena.p

1 answer

What is the time (in sec) required for depositing all the silver present in $125\;mL$ of $1\; M \;AgNO_3$ solution by passing a current of 241.25 A ? (IF=96500 coulombs)

asked Oct 30, 2013 by meena.p

1 answer

The energy of a photon is $3 \times 10^{-12}$ ergs. What is its wavelength in nm? $(h= 6.62 \times 10^{-27} ergs, c=3 \times 10^{10}cm/s)$

asked Oct 30, 2013 by meena.p

1 answer

The uncertainties in the velocities of two particle A and B are $0.05$ and $0.02\;m/s^{-1}$ respectively. The mass of B is five times to that of mass A. What is the ratio of uncertainties $\bigg(\large\frac{\Delta x_A}{\Delta x_B}\bigg)$ in their positions ?

asked Oct 30, 2013 by meena.p

1 answer

Which of the following statements is not correct ?

asked Oct 30, 2013 by meena.p

1 answer

Which of the following regents when heated with ethyl chloride, forms ethylene?

asked Oct 29, 2013 by meena.p

1 answer

Observe the following statements:

asked Oct 29, 2013 by meena.p

1 answer

Which of the following reactions an produce aniline as main product?

asked Oct 29, 2013 by meena.p

1 answer

Which of the following is not correct?

asked Oct 29, 2013 by meena.p

1 answer

Which of the following is used for making optical instruments?

asked Oct 29, 2013 by meena.p

1 answer

A molecule (X) has (i) four sigma bonds formed by the overlap of $sp^2$ and orbitals (ii) one sigma bond formed by $sp^2$ and $sp^2$ orbitals and (iii) one $\pi$ bond formed by $P_x$ and $P_z$ orbitals. Which of the following is X?

asked Oct 29, 2013 by meena.p

1 answer

what is the correct order of spin only magnetic moment (in BM) of $Mn^{2+},Cr^{2+}$ and $V^{2+}?$

asked Oct 29, 2013 by meena.p

1 answer