Recent questions in Chemistry

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

1 answer

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

1 answer

Match the following:

asked Oct 1, 2013 by meena.p

1 answer

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

1 answer

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

asked Oct 1, 2013 by meena.p

1 answer

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

asked Oct 1, 2013 by meena.p

1 answer

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

asked Sep 26, 2013 by meena.p

1 answer

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

1 answer

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

1 answer

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

1 answer

Which one of the following is a food preservative?

asked Sep 25, 2013 by meena.p

1 answer

Scurvy is caused by the deficiency of which vitamin?

asked Sep 25, 2013 by meena.p

1 answer

Proteins are:

asked Sep 25, 2013 by meena.p

1 answer

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

1 answer

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

asked Sep 25, 2013 by meena.p

1 answer

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

1 answer

Refer the below equation:

asked Sep 25, 2013 by meena.p

1 answer

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

asked Sep 25, 2013 by meena.p

1 answer

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

asked Sep 25, 2013 by meena.p

1 answer

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

asked Sep 25, 2013 by meena.p

1 answer

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

asked Sep 25, 2013 by meena.p

1 answer

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

asked Sep 25, 2013 by meena.p

1 answer

Which of the following metallurgical processes does not involve heating?

asked Sep 25, 2013 by meena.p

1 answer

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

1 answer

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

asked Sep 25, 2013 by meena.p

1 answer

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

asked Sep 25, 2013 by meena.p

1 answer

Electronegativity of group 13 elements follow the order:

asked Sep 25, 2013 by meena.p

1 answer

Which of the following statement are correct?

asked Sep 25, 2013 by meena.p

1 answer

The gases evolved in the decomposition of lead nitrate are:

asked Sep 25, 2013 by meena.p

1 answer

What is the empirical formula of sheet silicates ?

asked Sep 25, 2013 by meena.p

1 answer

The relative of $Ca,Sr,Mg$ and $Ba$ with water follow the order:

asked Sep 25, 2013 by meena.p

1 answer

Calcium carbide is hydrolyzed using heavy water. What are the products formed?

asked Sep 25, 2013 by meena.p

1 answer

According to Langmuir adsorption isotherm, the amount of gas absorbed by unit surface area is : (a,b,,k and n are constants; P=pressure of gas)

asked Sep 25, 2013 by meena.p

1 answer

Which one of the following pairs represents the intensive properties ?

asked Sep 25, 2013 by meena.p

1 answer

The order of $pH$ of $0.200\;M$ solutions of $NH_4NO_3,Na_2CO_3$ is:

asked Sep 25, 2013 by meena.p

1 answer

At $T(k),$ the partial pressures of $SO_2,O_2$ and $SO_3$ are $0.662,0.100$ and $0.331$ atm. respectively for the reaction $2 S0_2+O_2 \to 2 SO_3$ at equilibrium . What is the partial pressure in atm. of $O_2$ when the equilibrium partial pressures of $SO_2$ and $SO_3$ are equal at the same temperature?

asked Sep 25, 2013 by meena.p

1 answer

Match the following:

asked Sep 25, 2013 by meena.p

1 answer

In electro chemical corrosion, the metal undergoing corrosion :

asked Sep 25, 2013 by meena.p

1 answer

If the length of the unit cell is 5 A, the smallest distance in A between the two neighboring metal atoms in a face center cubic lattice is :

asked Sep 25, 2013 by meena.p

1 answer

For the electro chemical cell $M | M^{+} || X^{-} | X, E^{0}(M^{+} | M)=0.44\;V$ and $E^{0} (X | X ^{-})=0.33\;V.$ Which one of the following is true for this data?

asked Sep 25, 2013 by meena.p

0 answers

A solution of 10 g of non-volatile binary electrolyte (mol wt=100) in 500 g of water freezes at $-0.74^{\circ}C$ . What is the degree of ionisation ? ( $k_f$ of water $=1.85\;K \; molality^{-1})$

asked Sep 25, 2013 by meena.p

1 answer

In acidic medium, $100\; ml$ of $0.01\;M\;KMnO_4$ solution oxides $100\;ml$ of $H_2O_2$ solution. The volume of $0.01\;M\;KMnO_4$ required to oxidize the same volume of $H_2O_2$ in alkaline medium in ml. is :

asked Sep 25, 2013 by meena.p

1 answer

Which one of the following statement is not correct?

asked Sep 25, 2013 by meena.p

1 answer

A metal nitride contains $28 \%$ nitrogen by weight. The molecular formula of metal nitride is $M_3N_2$ . What is the atomic weight of metal?

asked Sep 24, 2013 by meena.p

1 answer

Identify Phenacetin from the following :

asked Sep 19, 2013 by meena.p

1 answer

The number of hydrogen bonds between Guanine & Cytosine; and between Adenine & Thymine in DNA is :

asked Sep 19, 2013 by meena.p

1 answer

Example of a biodegradable polymer pair is :

asked Sep 19, 2013 by meena.p

1 answer

Identify $X$ and $Y$ in the following reactions:

asked Sep 19, 2013 by meena.p

1 answer

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