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Recent questions tagged chemistry
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The atomic fraction of tin in bronze with FCC with adensity7717kg per metre
chemistry
asked
Sep 3, 2017
by
shivaprasad.k3588
0
answers
The atomic fraction of tin in bronze in fcc with a density of 7717 kg/m a
chemistry
asked
Sep 3, 2017
by
krishnaponnam1983
0
answers
Show that each line is Ballmer series of hydrogen atom will correspond to a
chemistry
asked
Sep 1, 2017
by
snehadey69210
0
answers
R of helium is 10972226 R of hydrogen is 10967758 M of helium is 3.9726 so
chemistry
asked
Sep 1, 2017
by
snehadey69210
0
answers
The energy of an elevtelectron I'm excited state of hydrogen atom is negati
chemistry
asked
Sep 1, 2017
by
snehadey69210
0
answers
Who gave the idea that elements can be differentiated by their properties?
cbsc
class 9
olympiad
science
chemistry
t4
asked
Sep 1, 2017
by
meena.p
0
answers
At a particular temperature solution which cannot dissolve more solute is called
cbsc
class 9
olympiad
science
chemistry
t3
asked
Sep 1, 2017
by
meena.p
1
answer
By passing hydrogen gas through vegetable oil, it is converted in to
cbsc
class 9
olympiad
science
chemistry
t3
asked
Sep 1, 2017
by
meena.p
1
answer
For a certain reaction $PV = 2 dm^3 atm$ and volume is $4 dm^3$ then corresponding pressure is
cbsc
class 9
olympiad
science
chemistry
t3
asked
Sep 1, 2017
by
meena.p
1
answer
At constant pressure average kinetic energy of gas molecules increases 2 times if
cbsc
class 9
olympiad
science
chemistry
t3
asked
Sep 1, 2017
by
meena.p
0
answers
Metals difficult to oxidize are called
cbsc
class 9
olympiad
science
chemistry
t3
asked
Sep 1, 2017
by
meena.p
1
answer
How many elements are present in two molecules of aspirin? The formula for aspirin is $C_9H_8O_4$.
cbsc
class 9
olympiad
science
chemistry
t3
asked
Sep 1, 2017
by
meena.p
1
answer
In the separation of dyes A and B by chromatography, component B has more solubility in the solvent. Which component will rise faster?
cbsc
class 9
olympiad
science
chemistry
t3
asked
Sep 1, 2017
by
meena.p
1
answer
classify the elements in the periodic table according to metallic character
chemistry
asked
Sep 1, 2017
by
mdjebon11
1
answer
Ethanol has a higher boiling point than dimethyl ether though they have the
chemistry
asked
Sep 1, 2017
by
ankityadavshahpura
1
answer
The depression in freezing point of 0.1 M aqueous solutions of HCl, CuSO4,
chemistry
asked
Sep 1, 2017
by
poojasinha0013
1
answer
Which element do not show -3 oxidation state?
chemistry
asked
Sep 1, 2017
by
mathurlaxmi234
1
answer
The stability +3 oxidation state increase from top to bottom of 15nth group
chemistry
asked
Sep 1, 2017
by
mathurlaxmi234
1
answer
Which element do not show -3 oxidation state?
chemistry
asked
Sep 1, 2017
by
mathurlaxmi234
1
answer
At given temperature vapour pressure of pure benzene is 120 mm.gh. at the s
chemistry
asked
Aug 31, 2017
by
bsdmlalikumae
1
answer
in a ccp structure of x atom. Y atoms occupy half of octahedral holes . if
chemistry
asked
Aug 31, 2017
by
praveenmadhukar89
0
answers
The number of valence electrons determines:
cbsc
class 9
olympiad
science
chemistry
t3
asked
Aug 31, 2017
by
meena.p
1
answer
The mass of a single atom of an element X is $2.65 \times 10^{-23}g$. The atomic mass and name of the element is:
cbsc
class 9
olympiad
science
chemistry
t3
asked
Aug 31, 2017
by
meena.p
1
answer
The first ionisation potential of mg,al,p and s of the order
chemistry
asked
Aug 31, 2017
by
vishwakarmamanoj942
0
answers
calculate the boiling point of one molar aqueous solution of KBr. density o
chemistry
asked
Aug 31, 2017
by
ksharma13.hs
1
answer
Which has maximum value of mean free path?
chemistry
asked
Aug 31, 2017
by
shankarjaybhaye75
0
answers
Which has maximum value of mean free path?
chemistry
asked
Aug 31, 2017
by
shankarjaybhaye75
0
answers
Calculated molar mass and experimental molar mass of a compound AB is 58.2
chemistry
asked
Aug 30, 2017
by
rajputsk000043
0
answers
What mass of slaked lime would be required to decompose completely 4 g of a
chemistry
asked
Aug 30, 2017
by
mardiyavatsal
0
answers
Soda water is a solution of carbon dioxide in water. This solution is composed of
cbsc
class 9
olympiad
science
chemistry
t3
asked
Aug 30, 2017
by
meena.p
1
answer
Some statements about the Rutherford’s a-particle scattering experiment are given : I. As most of the a-particles passed through the gold foil without getting deflected, the positive charge of the atom occupies the entire space. II. As very few particles were deflected from their path, very little space inside the atom is empty. III. As a very small fraction of a-particles were deflected by 180°, all the positive charge and mass of the gold atom were concentrated in a very small volume within the atom. Select the correct statement(s).
cbsc
class 9
olympiad
science
chemistry
t3
asked
Aug 30, 2017
by
meena.p
1
answer
The characteristic smell of rotten egg spreads throughout the room. This is due to
cbsc
class 9
olympiad
science
chemistry
t3
asked
Aug 30, 2017
by
meena.p
1
answer
Which one of the following is not an element of first transition series.?
cbsc
class 9
olympiad
science
chemistry
t3
asked
Aug 30, 2017
by
meena.p
1
answer
Alpha particles are .......nuclie that are doubly positively charged?
cbsc
class 9
olympiad
science
chemistry
t3
asked
Aug 30, 2017
by
meena.p
1
answer
Which one of the following is not included in the concept of four elements.
cbsc
class 9
olympiad
science
chemistry
t3
asked
Aug 30, 2017
by
meena.p
1
answer
Non-metals like to _____ electrons to become ______ ions.
cbsc
class 9
olympiad
science
chemistry
t2
asked
Aug 30, 2017
by
meena.p
1
answer
As compared to beryllium, magnesium is
cbsc
class 9
olympiad
science
chemistry
t2
asked
Aug 30, 2017
by
meena.p
1
answer
At constant pressure average kinetic energy of gas molecules increases 2 times if
cbsc
class 9
olympiad
science
chemistry
t2
asked
Aug 30, 2017
by
meena.p
1
answer
To prepare ammonia gas, gaseous mixture of
cbsc
class 9
olympiad
science
chemistry
t2
asked
Aug 30, 2017
by
meena.p
1
answer
Since atoms are neutral, the number of electrons is equal to the number of:
cbsc
class 9
olympiad
science
chemistry
t2
asked
Aug 30, 2017
by
meena.p
1
answer
In a sample of ethyl ethanoate $(CH_3COOC_2H_5 )$ the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it?
cbsc
class 9
olympiad
science
chemistry
t2
asked
Aug 30, 2017
by
meena.p
1
answer
Molten sodium chloride conducts electricity due to the presence of
cbsc
class 9
olympiad
science
chemistry
t2
asked
Aug 30, 2017
by
meena.p
1
answer
Out of 1 g of oxygen gas, 1 g of oxygen atoms and 1g of ozone , maximum number of atoms are present in:
cbsc
class 9
olympiad
science
chemistry
t2
asked
Aug 30, 2017
by
meena.p
0
answers
When a gold foil is bombarded by a beam of α particle, only a few of them get deflected whereas most go straight undeflected. This is because
cbsc
class 9
olympiad
science
chemistry
t2
asked
Aug 30, 2017
by
meena.p
1
answer
The sequence of steps for separating a mixture of salt, sand and camphor is:
cbsc
class 9
olympiad
science
chemistry
t2
asked
Aug 30, 2017
by
meena.p
1
answer
Wet clothes are kept for drying. Which of the following does not help them in drying:
cbsc
class 9
olympiad
science
chemistry
t2
asked
Aug 30, 2017
by
meena.p
1
answer
Angelo required an aqueous solution of sodium chloride. He made the solution by dissolving salt in:
cbsc
class 9
olympiad
science
chemistry
t2
asked
Aug 30, 2017
by
meena.p
1
answer
Elements whose oxidation number is increased are
cbsc
class 9
olympiad
science
chemistry
t2
asked
Aug 30, 2017
by
meena.p
1
answer
The quantum number not obtained from the Schrodinger wave equation
chemistry
asked
Aug 30, 2017
by
singhsuraj706141
0
answers
The quantum number not obtained from the Schrodinger wave equation
chemistry
asked
Aug 30, 2017
by
singhsuraj706141
1
answer
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