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Recent questions tagged chemistry
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A metal crystallises in a face centred cubic structure. If the edge length of its unit cell is ‘a’, the closest approach between two atoms in metallic crystal will be :
jeemain
2017
chemistry
set a
02042017
asked
Jul 27, 2017
by
meena.p
1
answer
The Tyndall effect is observed only when following conditions are satisfied (a) The diameter of the dispersed particles is much smaller than the wavelength of the light used. (b) The diameter of the dispersed particle is not much smaller than the wavelength of the light used. (c) The refractive indices of the dispersed phase and dispersion medium are almost similar in magnitude. (d) The refractive indices of the dispersed phase and dispersion medium differ greatly in magnitude.
jeemain
2017
chemistry
set a
02042017
asked
Jul 27, 2017
by
meena.p
0
answers
$\Delta U$ is equal to
jeemain
2017
chemistry
set a
02042017
asked
Jul 27, 2017
by
meena.p
0
answers
1 gram of a carbonate $(M_2CO_3)$ on treatment with excess HCl produces $0.01186$ mole of $CO_2$ . The molar mass of $M_2CO_3$ in $g\; mol^{−1}$ is :
jeemain
2017
chemistry
set a
02042017
asked
Jul 27, 2017
by
meena.p
0
answers
Given $C_{(graphite)}+O_2 (g) \to CO_2(g) ; \Delta_r H^{\circ} =-393.5\;kj\;mol^{-1}\\$ $H_2(g)+\large\frac{1}{2}$$O_2(g) \to H_2O(l) ; \Delta_r H^{\circ} =-285.8\;kj\;mol^{-1}\\$ $CO_2(g)+2H_2O(l) \to CH_4(g) +2O_2(g) ; \Delta_{r}H^{\circ} =+890.3\;kJ mol^{-1}\\$ Based on the above thermochemical equations, the value of $\Delta_r H^{\circ}$ at $298\; K$ for the reaction $ C_{(graphite)}+2H_2(g) \to CH_4(g) $ will be
jeemain
2017
chemistry
set a
02042017
asked
Jul 27, 2017
by
meena.p
0
answers
Gold (at wt. 197g mol-1) crystallises is a cubic closest packed structures
chemistry
asked
Jul 27, 2017
by
mnileshpratibha962ku
1
answer
a cubic unit cell in which a atom are missing from 2 corner and are replace
chemistry
asked
Jul 26, 2017
by
rahulcrmadridi
0
answers
a cubic unit cell in which a atom are missing from 2 corner and are replace
chemistry
asked
Jul 26, 2017
by
rahulcrmadridi
1
answer
1.5 g of a divalent metal displaced 4g of copper from a solution of cop
chemistry
asked
Jul 26, 2017
by
rayshreetam
1
answer
Calculate the wavelength and wave number for the following lines 8n Lyman s
chemistry
asked
Jul 26, 2017
by
sheshvaidehi
1
answer
Calculate the number of unit cells in 81.9g of aluminium if it crystallises
chemistry
asked
Jul 25, 2017
by
nancyjain419
1
answer
The vapour pressure of pure water at 37°C is 47.1 torr. What is the vapour
chemistry
asked
Jul 25, 2017
by
eanah0805
1
answer
Compound containing carbon hydrogen nitrogen and oxygen having mass ratio 1
chemistry
asked
Jul 24, 2017
by
sathyaroxx1999
1
answer
A compound containing carbon hydrogen nitrogen and oxygen having mass ratio
chemistry
asked
Jul 24, 2017
by
sathyaroxx1999
1
answer
If the distance between Na+ and Cl-ions in NaCl crystal is a pm what is the length of the cell edge ?
chemistry
asked
Jul 24, 2017
by
ssswatisingh999
1
answer
At 310 k the vapour pressure of ideal solution containing 2 moles of A and
chemistry
asked
Jul 24, 2017
by
rajukeesari30
0
answers
when 1l of co2 is heated with graphite the volume of the gases collected i
chemistry
asked
Jul 23, 2017
by
251kajalsweet1999
1
answer
100 ml of ph3 on heating form P and H2 . the volume change in the reaction
chemistry
asked
Jul 23, 2017
by
251kajalsweet1999
1
answer
100 ml of ph3 on heating forms P and H2. the volume change in the reaction
chemistry
asked
Jul 23, 2017
by
251kajalsweet1999
1
answer
Why total energy is least in the ground state ? Because energy Is inversely
chemistry
asked
Jul 23, 2017
by
snigdhamajumdar00
0
answers
Graph plotted between log x/m vs logo is a straight line at a angle 45 degr
chemistry
asked
Jul 23, 2017
by
rajukeesari30
1
answer
If is x1, is Y and is x2, then the value of Y will be
chemistry
asked
Jul 23, 2017
by
sonalverma176
1
answer
A solution containing 4 g of PVC in 2 litre of dioxane (industrial solvent)
chemistry
asked
Jul 23, 2017
by
sonalverma176
1
answer
the rise in the b.p of solution containing 1.8 g of glucose in 100 grams of
chemistry
asked
Jul 23, 2017
by
rajukeesari30
1
answer
caluculate the molal depression constant of a solvent which has freezing po
chemistry
asked
Jul 23, 2017
by
rajukeesari30
1
answer
what is normal b.p of an aquoues solution whose freezing point is -2.48 deg
chemistry
asked
Jul 23, 2017
by
rajukeesari30
0
answers
A box of 1L capacity is divided into two equal compartment by thin partitio
chemistry
asked
Jul 22, 2017
by
shettyshweta44
1
answer
The number of atoms in 100 g a Fcc crystal with density d=10 g/cm3 and cell
chemistry
asked
Jul 22, 2017
by
16217david
1
answer
Derive the relation between a and r for simple unit cell, body center and f
chemistry
asked
Jul 22, 2017
by
haya.m.sheth
1
answer
Bohr's orbits are called stationary orbitsor states ?
chemistry
asked
Jul 21, 2017
by
chhayasinghal0077
0
answers
How can i get accuracy in my numericals i have gone through a particular c
chemistry
asked
Jul 21, 2017
by
ssswatisingh999
0
answers
One gram of an alloy of aluminium and magnesium when heated with excess of
chemistry
asked
Jul 21, 2017
by
Pathanboy1709
1
answer
Which of the following has maximum number of atoms ? 18g of water 16g of Ox
chemistry
asked
Jul 21, 2017
by
rauldan611
0
answers
Time taken for an electron to complete one revolution in bohar orbit of hyd
chemistry
asked
Jul 21, 2017
by
divyadhanrajani625
1
answer
Energy of an electron in nth bhor orbit is given as
chemistry
asked
Jul 21, 2017
by
kalyaninamburi9
1
answer
one mole of element X has mass 3 /10 times of the mass of 1 mole of element
chemistry
asked
Jul 21, 2017
by
sindhumanojkumar2002
1
answer
one mole of element X has mass 3 /10 times of the mass of 1 mole of element
chemistry
asked
Jul 21, 2017
by
sindhumanojkumar2002
1
answer
Mass of one unit cell of NaCl is
chemistry
asked
Jul 20, 2017
by
varaprasadchem07
1
answer
Which of the following is beat electrolytes
chemistry
asked
Jul 20, 2017
by
pk1992915
1
answer
Which of the following compound gives reaction
chemistry
asked
Jul 20, 2017
by
pk1992915
1
answer
the range of radius ratio for an octahedral arrangement of ions in an ionic
chemistry
asked
Jul 19, 2017
by
abhilashb3171
1
answer
Wavelength =2000A then energy in ergs?
chemistry
asked
Jul 19, 2017
by
mscsurendra
1
answer
Explain the Eliminations reaction.
cbse
class 12
chemistry
haloalkanes and haloarenes theory question
asked
Jul 19, 2017
by
pady_1
1
answer
What is meant by ‘disproportionation’ of an oxidation state? Give an example
cbse
class 12
chemistry
d-and-f-blockelements theory question
asked
Jul 19, 2017
by
pady_1
1
answer
Give the Preparation of Potassium dichromate (K2Cr2O7)
cbse
class 12
chemistry
d-and-f-blockelements theory question
asked
Jul 19, 2017
by
pady_1
1
answer
Why Carboxylic acids have higher boiling point than aldehyde ketone and alcohols?
cbse
class 12
chemistry
alcohols
aldehydes
ketones and carboxylic acids theory question
asked
Jul 19, 2017
by
pady_1
1
answer
Explain the method of preparation of carboxilic acid from (1) Alcohols (2) Aldehyde
cbse
class 12
chemistry
alcohols
aldehydes
ketones and carboxylic acids theory question
asked
Jul 19, 2017
by
pady_1
1
answer
List the methods to Test to distinguish aldehydes and ketone
cbse
class 12
chemistry
alcohols
aldehydes
ketones and carboxylic acids theory question
asked
Jul 19, 2017
by
pady_1
1
answer
Explain Haloform Reaction
cbse
class 12
chemistry
alcohols
aldehydes
ketones and carboxylic acids theory question
asked
Jul 19, 2017
by
pady_1
1
answer
Give any two methods of preparation of Ketones
cbse
class 12
chemistry
alcohols
aldehydes
ketones and carboxylic acids theory question
asked
Jul 19, 2017
by
pady_1
1
answer
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