Recent questions tagged chemistry

The chemical reaction that involves roasting process is :

asked Oct 2, 2013 by meena.p

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Which of the following is a current statement?

asked Oct 2, 2013 by meena.p

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Helium mixed with oxygen is used in the treatment of :

asked Oct 2, 2013 by meena.p

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Which one of the following is formed apart from sodium chloride when chlorine reacts with hot concentrated sodium hydroxide ?

asked Oct 2, 2013 by meena.p

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Which one pf the following is most acidic?

asked Oct 1, 2013 by meena.p

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The oxide of nitrogen formed by thermal decomposition of $NH_4NO_3$ is :

asked Oct 1, 2013 by meena.p

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Which one of the following is the mineral for tin ?

asked Oct 1, 2013 by meena.p

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Diborane reacts with ammonia under different conditions to give a variety of products. Which one among the following is not formed in these reactions ?

asked Oct 1, 2013 by meena.p

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Solvay process is used in the manufacture of :

asked Oct 1, 2013 by meena.p

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The orange coloured compound formed when $H_2O_2$ is added to $TiO_2$ solution acidified with conc. $H_2SO_4$ is :

asked Oct 1, 2013 by meena.p

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A micelle formed during the cleansing action by the soap is :

asked Oct 1, 2013 by meena.p

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A system is provided with 50 Joules of heat and the work done on the system is 10 Joules. What is the change in internal energy of the system in Joules?

asked Oct 1, 2013 by meena.p

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The $pH$ of $0.01\;M$ solution of acetic acid is $5.0$. What are the values of $[H^{+}]$ and $K_{\alpha}$ respectively ?

asked Oct 1, 2013 by meena.p

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If the equilibrium constant for the reaction $H_{2(g)}+I_{2(g)} \rightleftharpoons 2 HI_{(g)}$ is $K $ What is the equilibrium constant of $HI_{(g)} \rightleftharpoons \large\frac{1}{2} $$H_{2(g)}+\large\frac{1}{2} $$I_{2(g)}$?

asked Oct 1, 2013 by meena.p

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What is the slope of the straight line for the graph drawn between ln $k$ and $\large\frac{1}{T}$, where $k$ is the rate constant of a reaction at temperature T?

asked Oct 1, 2013 by meena.p

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Assertion (A) : White tin is an example of tetragonal system. Reasoning (R): For a tetragonal system $a=b=c$ and $\alpha =\beta = \gamma \neq 90^{\circ}$. The correct answer is :

asked Oct 1, 2013 by meena.p

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A solution of concentration 'C' g equiv/ litre has a specific resistance R. The equivalent conductance of the solution is :

asked Oct 1, 2013 by meena.p

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At a certain temperature and at infinite dilution, the equivalent conductance of sodium benzoate, hydrochloric acid and sodium chloride are 240,349 and 229 $ohm^{-1} cm^2 equiv^{-1}$ respectively. The equivalent conductance of benzoic acid in $ohm^ {-1}\;cm^2\;equiv^{-1}$ at the same conditions is :

asked Oct 1, 2013 by meena.p

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X is a non-volatile solute and Y is a volatile solvent. The following vapour pressures are observed by dissolving X and Y :

asked Oct 1, 2013 by meena.p

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If $BaCl_2$ ionizes to an extent of $80 \%$ in aqueous solution, the value of Van't Hoff factor is :

asked Oct 1, 2013 by meena.p

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$CH_4$ diffuses two times faster than a gas X. The number of molecules present in 32 g of gas X is : (N is Avogadro number)

asked Oct 1, 2013 by meena.p

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The number of molecules of $CO_2$ liberated by the complete combustion of $0.1$ grams atom of graphite in air is :

asked Oct 1, 2013 by meena.p

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The ratio of anion radius to cation radius of a crystal is $10 : 9.3 $. Then, the coordination number of the cation in the crystal is :

asked Oct 1, 2013 by meena.p

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Match the following:

asked Oct 1, 2013 by meena.p

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The electron affinity values of elements A,B,C and D are respectively $-135,-60,-200$ and $-348$ kJ mol^{-1}.The outer electronic configuration of element B is :

asked Oct 1, 2013 by meena.p

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Which one pf the following conditions is incorrect for a well behaved wave function $(\psi)$?

asked Oct 1, 2013 by meena.p

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Which one of the following of an electron in hydrogen atom emits radiation of the lowest wavelength ?

asked Oct 1, 2013 by meena.p

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With the reference to the diagram given, the van der walls redius is equal to :

asked Sep 26, 2013 by meena.p

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In the Born-Haber cycle of the given reaction $Na(s)$$ +\large \frac{1}{2}$$ Cl_2 \to NaCl(s)$ the number of endothermic and exothermic stages respectively are:

asked Sep 26, 2013 by meena.p

1 answer

In which one of the following, the bond angle is the lowest?

asked Sep 26, 2013 by meena.p

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If the uncertainty in velocities of two particles A and B with mass $1.0 \times 10^{-27}\;kg$ and $1.0 \times 10^{-31}\;kg$ respectively is the same , the ratio of uncertainty in the positions of A and B is :

asked Sep 25, 2013 by meena.p

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The number of radial nodes present in the radial probability distribution curves for the orbital wave function with quantum numbers $n=4,l=0$ and $m=0$ is:

asked Sep 25, 2013 by meena.p

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Which one of the following is a food preservative?

asked Sep 25, 2013 by meena.p

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Scurvy is caused by the deficiency of which vitamin?

asked Sep 25, 2013 by meena.p

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Proteins are:

asked Sep 25, 2013 by meena.p

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Carbylamine test is used to detect which one of the following?

asked Sep 25, 2013 by meena.p

0 answers

Identify X in the following :

asked Sep 25, 2013 by meena.p

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Which component is formed when a mixture of calcium acetate and calcium formate is heated?

asked Sep 25, 2013 by meena.p

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Assertion (A): Ethanol boils at lower temperature than ethane. Reason (R): The molecular weight of ethanol is higher than that of ethane.

asked Sep 25, 2013 by meena.p

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Refer the below equation:

asked Sep 25, 2013 by meena.p

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The number of stereo isomers possible for $H_3C-CH(OH)-CH(OH)-CH_3$ is :

asked Sep 25, 2013 by meena.p

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Which one of the following does not give precipitate with ammonical cuprous chloride?

asked Sep 25, 2013 by meena.p

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Which one of the following alkenes gives only ethanal on ozonolysis?

asked Sep 25, 2013 by meena.p

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The reagent used to detect phosphorous in an organic compound is :

asked Sep 25, 2013 by meena.p

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Which one of the following is not a green - house gas?

asked Sep 25, 2013 by meena.p

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Which of the following metallurgical processes does not involve heating?

asked Sep 25, 2013 by meena.p

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The solution of $X$ having excess of caustic potash is used to detect ammonia. Which of the following is $X$?

asked Sep 25, 2013 by meena.p

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A mixture of $He,Ne,Kr$ and $Xe$ is cooled. Which one of them condenses first?

asked Sep 25, 2013 by meena.p

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Bond energy of $F_2,Cl_2$ and $Br_2$ follow the order:

asked Sep 25, 2013 by meena.p

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Electronegativity of group 13 elements follow the order:

asked Sep 25, 2013 by meena.p

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