Recent questions tagged chemistry

Which of the following is not correct ?

asked Oct 30, 2013 by meena.p

1 answer

Which of the products is formed when acetone is reacted with barium hydroxide solution ?

asked Oct 30, 2013 by meena.p

1 answer

$5ml$ of a gaseous hydrocarbon was exposed to $30ml$ of $O_2$.The resultant gas,on cooling is found to measure $25\;ml$ of which $10\;ml$ are obsorbed by NaOH and the remainder by pyrogallol.Determine molecular formula of hydrocarbons .All measurement are made at constant pressure and temperature.

asked Oct 30, 2013 by sreemathi.v

1 answer

At $T(K) , 100 L$ of dry oxygen is present in a sealed container. It is subjected to silent electric discharge , till the volumes of oxygen and ozone become equal. What is the volume (in liters) of ozone formed at $T(k)$?

asked Oct 30, 2013 by meena.p

1 answer

Calculate number of oxalic acid molecules in 100ml of 0.02N oxalic acid

asked Oct 30, 2013 by sreemathi.v

1 answer

Calculate molecules of methane,C and H atoms in 25g methane

asked Oct 30, 2013 by sreemathi.v

1 answer

Which of the following is added to chloroform to slow down its aerial oxidation in presence of light?

asked Oct 30, 2013 by meena.p

1 answer

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

The vapour density of a mixture containing $NO_2$ and $N_2O_4$ is 38.3 at $27^{\large\circ}C$.Calculate the mole of $NO_2$ in 100g mixture

asked Oct 30, 2013 by sreemathi.v

1 answer

A plant virus is found to consist of uniform cylindrical particles of 150A in diameter and 5000A long.The specific volume of the virus is $0.75cm^3/g$.If the virus is considered to be a single particle and its molecular weight

asked Oct 30, 2013 by sreemathi.v

1 answer

Find the number of g-molecules of oxygen in $6.023\times 10^{24}$ CO molecules

asked Oct 30, 2013 by sreemathi.v

1 answer

Calculate the mass of $CaO$ that shall be obtained by heating 20 kg of 80 % pure lime-stone $(CaCO_3)$

asked Oct 30, 2013 by sreemathi.v

1 answer

$H_2O_2$ is marked 22.4 volume.How much of it is required to oxidize 3.5g $H_2S$ gas ?

asked Oct 30, 2013 by sreemathi.v

1 answer

How many moles of electron weigh one kilogram ?

asked Oct 30, 2013 by sreemathi.v

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The density (in $gml^{-1})$ of a 3.60M sulphuric acid solution that is 29% $H_2SO_4$ (Molar mass=$98gmol^{-1})$ by mass will be :

asked Oct 30, 2013 by sreemathi.v

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

In the reaction $2Al(s)+6HCl(aq)\rightarrow 2Al^{3+}(aq)+6Cl^{-1}(aq)+3H_2(g)$

asked Oct 30, 2013 by sreemathi.v

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

Density of a 2.05M solution of acetic acid in water is 1.02 g/mL. The molality of the solution is

asked Oct 30, 2013 by sreemathi.v

1 answer

Which of the following statements is not correct ?

asked Oct 30, 2013 by meena.p

1 answer

How many EDTA (ethylene diamine tetracetic acid)molecules are required to make an octahedral complex with a $Ca^{2+}$ ion ?

asked Oct 30, 2013 by sreemathi.v

2 answers

How many moles of magnesium phosphate $Mg(PO_4)_2$ will contain 0.25 mole of oxygen atom ?

asked Oct 30, 2013 by sreemathi.v

1 answer

If $\large\frac{1}{6}$, in place of $\large\frac{1}{12}$ mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will :

asked Oct 30, 2013 by sreemathi.v

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

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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

The standard reduction potentials of $Zn^{2-} |Zn,Cu^{2+}|Cu$ and $Ag^{+} | Cu\;and\;Ag^{+}|Ag$ are respectively $-0.76,0.34$ and $0.8\;V$. The following cells were constructed :

asked Oct 29, 2013 by meena.p

1 answer

Two solution of a substance (non-electrolyte) are mixed in the following manner,480ml of 0.5M of first solution with 520 ml of 1.2m of second solution.The molarity of final solution is

asked Oct 29, 2013 by sreemathi.v

1 answer

$3.92g$ of ferrous ammonium sulphate crystals are dissolved in 100ml of water.20ml of this solution requires 18ml of potassium permanganate during titration for complete oxidation .The weight of $KMnO_4$ present in one litre of the solution is

asked Oct 29, 2013 by sreemathi.v

1 answer

$8g$ of sulphur are burnt to form $SO_2$,which is oxidized by $Cl_2$.The solution is treated with $BaC_2$ solution.The amount of $BaSO_4$ percipitated is

asked Oct 29, 2013 by sreemathi.v

1 answer

Consider the decomposition reaction of nitroglycerine $4C_3H_5N_3O_9\rightarrow 6N_2+12CO_2+10H_2O+O_2$. If $200g$ nitroglycerine gives 6.55g $O_2$, then percent yield of the reaction is

asked Oct 29, 2013 by sreemathi.v

1 answer

$100\;mL$ of a mixture of $NaOH$ and $Na_2SO_4$ is neutralized by $10\;mL$ of $0.5\;M$ $H_2SO_4$. Hence $NaOH$ in $100\;mL$ solution is

asked Oct 29, 2013 by sreemathi.v

1 answer

Volume of 2m HCl required to neutralize the solution containing 1 mole of $NH_4Cl$ and $1$ mole of NaOH is

asked Oct 29, 2013 by sreemathi.v

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Mole fraction of $I_2$ in $C_6H_6$ is 0.2.The molality of $I_2$ in $C_6H_6$ is

asked Oct 29, 2013 by sreemathi.v

1 answer

The mole fraction of the solute in one molar aqueous solution is

asked Oct 29, 2013 by sreemathi.v

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3.0mole NaOH solution has a density of 1.110g/ml.The molarity of the solution is

asked Oct 29, 2013 by sreemathi.v

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Molarity of $H_2SO_4$(density 1.8g/ml) is 18m.The molality of this $H_2SO_4$ is

asked Oct 29, 2013 by sreemathi.v

1 answer

If $30ml$ of $H_2$ and $20ml$ of $O_2$ react to form water,what is left at the end of the reaction

asked Oct 29, 2013 by sreemathi.v

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