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Recent questions tagged chemistry
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The radius of Bohr's first orbit is $Li^{2t}$ is
jeemain
chemistry
question-paper-1
asked
Apr 6, 2015
by
meena.p
1
answer
For the vaporization process of HI, the molar entropy and molar enthalpy are respectively $89.0\;jk^{-1}$ and $21.16\;kj\;mol^{-1}$. The temperature at which the value of $\delta G$ becomes zero for this process is
jeemain
chemistry
question-paper-1
asked
Apr 6, 2015
by
meena.p
1
answer
The values of four quantum number of valence electron of an element $n=4,l=0,m=0$ and $s= \large\frac{+1}{2}$. The element is
jeemain
chemistry
question-paper-1
asked
Apr 6, 2015
by
meena.p
1
answer
The correct order of $ \angle FMF$ bond angles in $NSF_3,SiF_4$ and $PoF_3$ is
jeemain
chemistry
question-paper-1
asked
Apr 6, 2015
by
meena.p
1
answer
For an irreversible reaction $A \to 2B$ , the rate is increased by four times when the concentration of A is doubled. The incorrect statement about this reaction is
jeemain
chemistry
question-paper-1
asked
Apr 6, 2015
by
meena.p
1
answer
WHY FECO3 ORE CAN NOT BE USED IN BLAST FURNACE FOR EXTRACTION OF IRON?
chemistry
iron
ore
class
12
metallurgy
general-principals-and-processes-of-isolation-of-metals
cbse
asked
Mar 21, 2015
by
ghoshrudraprasad2
0
answers
Why does PbI4 not exist
chemistry
asked
Jan 21, 2015
by
venkatesh.purushotham
1
answer
explain the following reaction
chemistry
asked
Jan 21, 2015
by
venkatesh.purushotham
1
answer
differentiate between monomer and dimer with an example ?
chemistry
asked
Jan 21, 2015
by
venkatesh.purushotham
1
answer
what is the difference between the structure of AlCl3 and diborane?
chemistry
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
chemistry
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 ?
chemistry
asked
Jan 21, 2015
by
venkatesh.purushotham
1
answer
why sand is used to extinguish fire during wars and not water?
chemistry
asked
Jan 20, 2015
by
venkatesh.purushotham
1
answer
Why group 2 elements have stronger metallic bonding than group 1 elements?
chemistry
asked
Jan 20, 2015
by
venkatesh.purushotham
1
answer
How can we say that Higher the metallic bonding , Higher is the electrical conductivity?
chemistry
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?
chemistry
asked
Jan 20, 2015
by
venkatesh.purushotham
1
answer
Why lithium stearateis used for lubricating bearings in machines?
chemistry
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
chemistry
asked
Jan 20, 2015
by
venkatesh.purushotham
1
answer
how bond length is same for both hydrogen and deuterium molecules?
chemistry
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 .
chemistry
asked
Jan 20, 2015
by
venkatesh.purushotham
1
answer
why enthalpy of hydration is negative?
chemistry
asked
Jan 20, 2015
by
venkatesh.purushotham
1
answer
why smaller the size of the cation - then greater is the hydration enthalpy?
chemistry
asked
Jan 20, 2015
by
venkatesh.purushotham
1
answer
what would be the ratio of mean square velocity of hydrogen gas at 50K and that of oxygen gas at 800K?
jeemain
chemistry
class12
states-of-matter
kinetic-molecular-theory-of-gases
mean-square-velocity
easy
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.
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
solved problems
composition-of-a-solution
medium
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 $Fe(III)?$
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
solved problems
composition-of-a-solution
medium
asked
Aug 11, 2014
by
meena.p
1
answer
Calculate the percentage of void volume in the body centred
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
solved problems
composition-of-a-solution
medium
asked
Aug 11, 2014
by
meena.p
1
answer
Calculate the percentage of void volume in the primitive
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
solved problems
composition-of-a-solution
medium
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.
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
solved problems
composition-of-a-solution
medium
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
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
solved problems
composition-of-a-solution
medium
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 $NaCl$
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
solved problems
composition-of-a-solution
medium
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 ?
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
solved problems
composition-of-a-solution
medium
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 ?
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
solved problems
composition-of-a-solution
medium
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}$
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
solved problems
composition-of-a-solution
medium
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 $M(C_s)=133\;g\;mol^{-1}$
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
solved problems
composition-of-a-solution
medium
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 $CsCl$
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
solved problems
composition-of-a-solution
medium
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.
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
solved problems
composition-of-a-solution
medium
asked
Aug 8, 2014
by
meena.p
1
answer
Calculate the mole fraction of ethylene glycol $(C_2H_6O_2)$ in a solution containing 20% of $C_2H_6O_2$ by mass.
cbse
class12
chemistry
ch2
solutions
sec-c
medium
additionalproblem
q50
asked
Aug 8, 2014
by
sreemathi.v
1
answer
At 300K,36g of glucose present per litre in its solution has an osmotic pressure of 4.98 bar.If osmotic pressure of solution is 1.52 bar at the same temperature,what would be its concentration?
cbse
class12
chemistry
ch2
solutions
sec-a
easy
additionalproblem
q49
asked
Aug 8, 2014
by
sreemathi.v
1
answer
What is the mole fraction of a solute,in 2.5m aqueous solution?
cbse
class12
chemistry
ch2
solutions
sec-b
medium
additionalproblem
q48-b
asked
Aug 8, 2014
by
sreemathi.v
1
answer
A 4% solution of sucrose is isotonic with 3% solution of an unknown organic substance.Calculate the molecular mass of unknown substance .
cbse
class12
chemistry
ch2
solutions
sec-b
easy
additionalproblem
q48-a
asked
Aug 8, 2014
by
sreemathi.v
1
answer
A 0.1539 molal aqueous solution of cane sugar (mol mass =$342gmol^{-1}$) has a freezing point of 271K while the freezing point of pure water is $273.15K$.What will be the freezing point of an aqueous solution containing 5g of glucose (mol mass =$180gmol^{-1}$) per 100g of solution.
cbse
class12
chemistry
ch2
solutions
sec-b
medium
additionalproblem
q47
asked
Aug 8, 2014
by
sreemathi.v
1
answer
The freezing point of a solution containing 0.2g of acetic acid is 20.0g of benzene is lowered by $0.45^{\large\circ}$C.Calculate Van't Hoff factor .[For benzene,$K_f=5.12Kkg mol^{-1}]$.What conclusion can you draw from the value of Van't Hoff factor obtained.
cbse
class12
chemistry
ch2
solutions
sec-b
medium
additionalproblem
q46-ii
asked
Aug 8, 2014
by
sreemathi.v
1
answer
The freezing point of a solution containing 0.2g of acetic acid is 20.0g of benzene is lowered by $0.45^{\large\circ}$C. Calculate the molar mass of acetic acid from this data?[For benzene,$K_f=5.12Kkg mol^{-1}]$
cbse
class12
chemistry
ch2
solutions
sec-b
easy
additionalproblem
q46-i
asked
Aug 8, 2014
by
sreemathi.v
1
answer
0.5g KCl was dissolved in 100g water and the solution originally at $20^{\large\circ}C$,froze at $-0.24^{\large\circ}C$.Calculate the percentage ionization of salt.$(K_f$ per 1000g of water =1.86K)
cbse
class12
chemistry
ch2
solutions
sec-c
easy
additionalproblem
q45
asked
Aug 8, 2014
by
sreemathi.v
1
answer
What concentration of nitrogen should be present in a glass of water at room temperature.Assume a temperature of $25^{\large\circ}C$,a total pressure of atmosphere and mole fraction of nitrogen in air of 0.78.[$K_H$ for nitrogen =$8.42\times 10^{-7}$M/mm Hg]
cbse
class12
chemistry
ch2
solutions
sec-b
medium
additionalproblem
q44
asked
Aug 8, 2014
by
sreemathi.v
1
answer
100 mg of a protein is dissolved in enough water to make 10.0mL of a solution.If this solution has an osmotic pressure of 13.3 mm Hg at $25^{\large\circ}C$.What is the molar mass of protein.
cbse
class12
chemistry
ch2
solutions
sec-b
easy
additionalproblem
q43
asked
Aug 8, 2014
by
sreemathi.v
1
answer
Calculate the molarity and molality of a 15% solutions (by weight) of sulphuric acid density $1.020g cm^{-3}$.(Atomic masses H=10=16S=32 amu)
cbse
class12
chemistry
ch2
solutions
sec-b
medium
additionalproblem
q42
asked
Aug 8, 2014
by
sreemathi.v
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 $Mo= 95.94 \;g\;mol^{-1}$
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
solved problems
composition-of-a-solution
medium
asked
Aug 8, 2014
by
meena.p
1
answer
A solution containing,8g of a substance in 100g of diethyl ether boils at $36.86^{\large\circ}C$,whereas pure ether boils at $35.60^{\large\circ}C$.Determine the molecular mass of the solute.(For ether $K_b=2.02kg mol^{-1})$
cbse
class12
chemistry
ch2
solutions
sec-b
easy
additionalproblem
q41
asked
Aug 8, 2014
by
sreemathi.v
1
answer
The van't Hoff factor of the compound $K_3Fe(CN)_6$ in dilute solution is
jeemain
chemistry
physical-chemistry
class12
ch2
solutions
vant-hoff-factor
colligative-properties
vant-hoff
easy
asked
Aug 8, 2014
by
meena.p
2
answers
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