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Questions >> JEEMAIN and NEET >> Chemistry

Chemistry

Why does PbI4 not exist

asked Jan 21, 2015 by venkatesh.purushotham

1 answer

explain the following reaction

asked Jan 21, 2015 by venkatesh.purushotham

1 answer

differentiate between monomer and dimer with an example ?

asked Jan 21, 2015 by venkatesh.purushotham

1 answer

what is the difference between the structure of AlCl3 and diborane?

asked Jan 21, 2015 by venkatesh.purushotham

1 answer

The relative strength of Lewis acidity of boron trihalides is found to follow the following trend. BI3>BBr3>BCl3>BF3

asked Jan 21, 2015 by venkatesh.purushotham

1 answer

How is valency of a carbon atom in graphite satisfied as each carbon atom is bonded to only three other carbon atoms ?

asked Jan 21, 2015 by venkatesh.purushotham

1 answer

why sand is used to extinguish fire during wars and not water?

asked Jan 20, 2015 by venkatesh.purushotham

1 answer

Why group 2 elements have stronger metallic bonding than group 1 elements?

asked Jan 20, 2015 by venkatesh.purushotham

1 answer

How can we say that Higher the metallic bonding , Higher is the electrical conductivity?

asked Jan 20, 2015 by venkatesh.purushotham

1 answer

The hydration enthalpy of lithium is less negative or more negative as compared to other elements in its group?

asked Jan 20, 2015 by venkatesh.purushotham

1 answer

Why lithium stearateis used for lubricating bearings in machines?

asked Jan 20, 2015 by venkatesh.purushotham

1 answer

Why is a barium salt like barium sulphate used in diagnosing ulcers? answer by tomorrow as i have exam on thurshday

asked Jan 20, 2015 by venkatesh.purushotham

1 answer

how bond length is same for both hydrogen and deuterium molecules?

asked Jan 20, 2015 by venkatesh.purushotham

1 answer

why ΔH = energy used in bond breaking reactions − energy released in bond making products and not ΔH = energy released in bond making products - energy used in bond breaking reactions .

asked Jan 20, 2015 by venkatesh.purushotham

1 answer

why enthalpy of hydration is negative?

asked Jan 20, 2015 by venkatesh.purushotham

1 answer

why smaller the size of the cation - then greater is the hydration enthalpy?

asked Jan 20, 2015 by venkatesh.purushotham

1 answer

what is inductomeric effect ?

asked Jan 7, 2015 by shiva31smart

1 answer

explain meta directing property of CCl3 due to +R effect or reverse conjugation?

asked Jan 7, 2015 by shiva31smart

1 answer

In the cathode ray experiment how low pressure can increase the space between the atoms of the gas?

asked Dec 22, 2014 by venkatesh.purushotham

1 answer

main function of roasting

asked Dec 12, 2014 by sudharsanselvam2

2 answers

fractional distillation of coal tar yieds?

asked Dec 12, 2014 by sudharsanselvam2

1 answer

examples for ore of aluminium

asked Dec 12, 2014 by sudharsanselvam2

2 answers

How to determine osmotic pressure in mixture of three different solution?

asked Nov 30, 2014 by abhishek97banerjee

1 answer

How to determine molarity in simple way?

asked Nov 27, 2014 by abhishek97banerjee

1 answer

what would be the ratio of mean square velocity of hydrogen gas at 50K and that of oxygen gas at 800K?

asked Sep 18, 2014 by anonymous

1 answer

A sample of wustite $Fe_xO$ contains one $Fe(III)$ for every three $Fe(II).$ Calculate the value of x.

asked Aug 11, 2014 by meena.p

1 answer

The composition of a sample of wiistite is $Fe_{0.93} O_{1.00-}$ . What percentage of the ion is present in the form of $Fe(III)?$

asked Aug 11, 2014 by meena.p

1 answer

Calculate the percentage of void volume in the body centred

asked Aug 11, 2014 by meena.p

1 answer

Calculate the percentage of void volume in the primitive

asked Aug 11, 2014 by meena.p

1 answer

Lil occurs as cubical - closest packing . If the edge length of a unit cell is $624\;pm$ , determine the ionic radii of $Li^{+}$ and $I^{-}$ ions.

asked Aug 11, 2014 by meena.p

1 answer

KCl crystallizes in the same type of lattice as does $NaCl$ . Given that $\large\frac{r_{Na^{+}}}{r_{cl^{-}}}$ $=0.5$ and $\large\frac{r_{Na^{+}}}{r_{K^{+}}}$ $=0.5$ calculate the ratio of density of NaCl to that KCl

asked Aug 11, 2014 by meena.p

1 answer

KCl crystallizes in the same type of lattice as does $NaCl$ . Given that $\large\frac{r_{Na^{+}}}{r_{cl^{-}}}$ $=0.5$ and $\large\frac{r_{Na^{+}}}{r_{K^{+}}}$ $=0.5$ calcute the ratio of the unit cell for $KCl$ to that for $NaCl$

asked Aug 11, 2014 by meena.p

1 answer

If the radius of $Cs^{+}$ is $169\;pm$ and that of $Cl^{-}$ is $181\;pm$ , predict the structure of $CsCl$ . What is the coordination number of $Cs^{+}$ ion ?

asked Aug 11, 2014 by meena.p

1 answer

A solid $A^{+}B^{-}$ has an $NaCl$ type closet packed structure . If the radius of the anion is $250\;pm$ What is the radius of the cation ?

asked Aug 8, 2014 by meena.p

1 answer

The atomic radius of stronitum is $215\;pm$ and it crystallizes with a cubical closest - packed structure . Calculate the density of strontium. The molar mass of strontium is $87.6\;g\;mol^{-1}$

asked Aug 8, 2014 by meena.p

1 answer

Caesium chloride may be considered to form interpenetrating simple primitive cubic crystals. The edge length of unit cell is $412\;pm$ . Determine the ionic radius of $Cs^{+}$ if the ionic radius of $Cl^{-}$ if the ionic radius of $Cl^{-}$ is $181$ P.m Given $M(C_s)=133\;g\;mol^{-1}$

asked Aug 8, 2014 by meena.p

1 answer

Caesium chloride may be considered to form interpenetrating simple primitive cubic crystals. The edge length of unit cell is $412\;pm$ . Determine the density of $CsCl$

asked Aug 8, 2014 by meena.p

1 answer

The edge length of cubic unit cell of metallic calcium is $556\;pm$ If the density of calcium is $1.54 \;g\;cm^{-3}$ and its molar mass is $40.08];g\;mol^{-1}$ calculate the radius of calcium atom.

asked Aug 8, 2014 by meena.p

1 answer

Calculate the radius of molybdenum atom if the element crystallizes as body- centred cubic crystals. Given: Density of $Mo=10.3\;g\;cm^{-3}$ and molar mass of $Mo= 95.94 \;g\;mol^{-1}$

asked Aug 8, 2014 by meena.p

1 answer

The van't Hoff factor of the compound $K_3Fe(CN)_6$ in dilute solution is

asked Aug 8, 2014 by meena.p

2 answers

The Van't Hoff factor of acetic acid in water will be

asked Aug 8, 2014 by meena.p

1 answer

The van't hoff factor for $0.1\; molal\;Ba(NO_3)_2$ solution is $2.74$ . Its degree of dissociation is

asked Aug 8, 2014 by meena.p

1 answer

Which of following electrolytes would have the same van't hoff factor as that of potassium ferricyanide ?

asked Aug 8, 2014 by meena.p

1 answer

The Van't Hoff factor of benzoic acid in benzene is found to be

asked Aug 8, 2014 by meena.p

1 answer

The degree of dissociation $(\alpha)$ of a weak electrolyte $A_xB_y$ is related to van't Hoff factor (i) by the expression

asked Aug 8, 2014 by meena.p

1 answer

A $0.004\;M$ solution of $K_2SO_4$ is isotonic with a $0.010\;M$ Solution of glucose at the same temperature . Tge apparent per cent degree of dissociation of $K_2SO_4$ is

asked Aug 7, 2014 by meena.p

1 answer

Which of the following pairs of solutions are expected to be isotonic?

asked Aug 7, 2014 by meena.p

1 answer

In the phenomenon of osmosis through the semipermeable membrane

asked Aug 7, 2014 by meena.p

1 answer

The osmotic pressure of $0.1\;M$ sodium chloride solution at $27^{\circ}C$ is

asked Aug 7, 2014 by meena.p

1 answer

The osmotic pressure of a solution $(density =1.02\;g \;cm^{-3})$ Containing 50 g glucose $(C_6H_{12}O_6)$ in 1 kg of water at 300 K is

asked Aug 7, 2014 by meena.p

1 answer

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