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Recent questions tagged class11
Questions
The pair having identical value of $\large\frac{e}{m}$:
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
sub-atomic-particles
q10
easy
asked
Jan 9, 2014
by
sreemathi.v
1
answer
Find the wave length of radiation required to excite the electron in ground level of $Li^{++}(z=3)$ to third energy level.Also find the ionization energy of $Li^{2+}$.(R=$1.097\times 10^7m^{-1})$
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bhor's-model
q9
medium
asked
Jan 9, 2014
by
sreemathi.v
1
answer
Calculate the wave length of light radiation that would be emitted,when an electron in the fourth Bohr's orbit of $He^+$ ion falls to the second Bohr's orbit.To what transition does this light radiation correspond in the H-atom?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bhor's-model
q8
medium
asked
Jan 9, 2014
by
sreemathi.v
1
answer
It is given that the events A and B are such that $P(A) = \large\frac{1}{4}\: \: P \bigg( \large\frac{A}{B} \bigg) \large\frac{1}{2}\: and \: P \bigg( \large\frac{B}{A} \bigg) = \large\frac{2}{3}$ Then $P(B)$ is
jeemain
math
cbse
class11
probability
axiomatic-approach-to-probability
difficult
q13
asked
Jan 9, 2014
by
thanvigandhi_1
1
answer
A spectral line in the spectrum of $H$-atom has a wave number of $15222.22cm^{-1}$. What transition is responsible for this radiation? (Rydberg constant $R=1.096\times 10^5cm^{-1}$)
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bhor's-model
q7
medium
asked
Jan 9, 2014
by
sreemathi.v
1
answer
Estimate the wavelength of second line (also called as $\beta$-line) in Balmer series of hydrogen atom
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bhor's-model
q6
medium
asked
Jan 9, 2014
by
sreemathi.v
1
answer
A hydrogen atom in the ground state is hit by a particle exciting the electron to 4s orbital.The electron then drops to 2s orbital.What is the frequency of radiation emitted and absorbed in the process?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q5
medium
asked
Jan 9, 2014
by
sreemathi.v
1
answer
Determine the frequency of revolution of the electron in $2^{nd}$ Bohr's orbit in hydrogen atom
sat
chemistry
atomic-structure
jeemain
physical-chemistry
class11
unit2
bhor's-model
q4
medium
asked
Jan 9, 2014
by
sreemathi.v
1
answer
Calculate the velocity of electron ejected from platinum surface when radiation of 200nm fall on it. Work function of platinum is 5eV. $(1eV=1.6\times 10^{-19}J$)
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q3
medium
asked
Jan 9, 2014
by
sreemathi.v
1
answer
A 100W power source emits green light at a wavelength $\lambda=5000\overset{\circ}{A}$. How many photons per minute are emitted by the source?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
q2
medium
asked
Jan 9, 2014
by
sreemathi.v
1
answer
Given the $\lambda$ values for violet light ($\lambda=4.10\times 10^{-5}cm)$ and red light($\lambda=6.56\times 10^{-5}cm$), which of the following is true about the ratio of energies carried by them and their frequencies?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bohr's-modle
q1
medium
asked
Jan 9, 2014
by
sreemathi.v
1
answer
Two elements A (atomic weight = 75) and B (atomic weight = 16) combine to yield a compound. The % by weight of A in the compound was found to be 75.08 . The formula of the compound is :
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
atomic-and-molecular-masses
q54
easy
asked
Jan 9, 2014
by
sreemathi.v
1
answer
A compound was found to contain 5.37% nitrogen.What is the minimum molecular weight of compound?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
atomic-and-molecular-masses
q53
easy
asked
Jan 9, 2014
by
sreemathi.v
1
answer
The haemoglobin from the red blood corpuscles of most mammals contains approximately 0.33% of iron by weight.The molecular weight of haemoglobin as 67,200.The numbers of iron atoms in each molecule of haemoglobin is (at wt of iron=56)
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
atomic-and-molecular-masses
q52
easy
asked
Jan 9, 2014
by
sreemathi.v
1
answer
Insulin contains 3.4% sulphur.The minimum mol weight of insulin is :
sat
chemistry
stoichiometry and the mole concept
jeemain
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q51
easy
asked
Jan 9, 2014
by
sreemathi.v
1
answer
An ore contains 2.0% by weight of the mineral argentive $(Ag_2S)$.How much of ore should be taken to produce 1.0g pure Ag?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
laws-of-chemical-combinations
q50
easy
asked
Jan 9, 2014
by
sreemathi.v
1
answer
How many of $KCl$ would have to be dissolved in 60g $H_2O$ to give 20% by weight of solution?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q49
easy
asked
Jan 9, 2014
by
sreemathi.v
1
answer
The mole fraction of NaCl in a solution containing 1 mole of NaCl in 1000g of water is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q48
easy
asked
Jan 9, 2014
by
sreemathi.v
1
answer
Number of $H^+$ ions in 100ml of 0.001M $H_2SO_4$ is
sat
chemistry
stoichiometry and the mole concept
jeemain
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q47
easy
asked
Jan 9, 2014
by
sreemathi.v
1
answer
Which does not change on dilution?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q46
easy
asked
Jan 9, 2014
by
sreemathi.v
1
answer
The probability that $ \sin^{-1} ( \sin \: x)+ \cos^{-1} ( \cos\: y)$ is an integer $ x,y \in \{ 1,2,3,4 \} $ is
jeemain
math
cbse
class11
probability
random-experiements
easy
q36
asked
Jan 8, 2014
by
thanvigandhi_1
1
answer
Let A and B be two independent events such that $P(A) = \large\frac{1}{5} \: P( A \cup B ) = \large\frac{7}{10}$. Ten $ P(\overline B)$ is equal to
jeemain
math
cbse
class11
probability
axiomatic-approach-to-probability
medium
q15
asked
Jan 8, 2014
by
thanvigandhi_1
1
answer
$RH_2$(ion exchange resin)can replace $Ca^{2+}$ in hand water as,$RH_2+Ca^{2+}\rightarrow RCa+ 2H^+$.1 litre of hard water passing through $RH_2$ has PH is 2.Hence hardness in PPM of $Ca^{2+}$ is:
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q45
easy
asked
Jan 8, 2014
by
sreemathi.v
1
answer
A box contains 3 white and 2 red balls. If we draw one ball and without replacing the first ball, the probability of drawing red ball in the second draw is
jeemain
math
cbse
class11
probability
random-experiements
medium
q14
asked
Jan 8, 2014
by
thanvigandhi_1
1
answer
How much water is to be added to dilute 10ml of 10M HCl to make it decimolar?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q44
easy
asked
Jan 8, 2014
by
sreemathi.v
1
answer
25ml of 3.0M $HNO_3$ are mixed with 75ml of 4.0M $HNO_3$.If the volumes are additive,the molarity of the final mixture would be :
jeemain
chemistry
physical-chemistr
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q43
easy
asked
Jan 8, 2014
by
sreemathi.v
1
answer
Amount of oxygen required for complete combustion of 27g Al is
sat
chemistry
stoichiometry and the mole concept
jeemain
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
laws-of-chemical-combinations
q42
easy
asked
Jan 8, 2014
by
sreemathi.v
1
answer
The % loss in weight after heating a pure sample of potassium chlorate (M wt:122.5) will be
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
atomic-and-molecular-masses
q41
easy
asked
Jan 8, 2014
by
sreemathi.v
1
answer
For the reaction :$A+2B\rightarrow C$,5 mole of A and 8 mole of B will produce
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q40
easy
asked
Jan 8, 2014
by
sreemathi.v
2
answers
A fair die is tossed until a number greater than 4 appears. The probability that an even number of tosses shall be required is
jeemain
math
cbse
class11
probability
events
difficult
q7
asked
Jan 8, 2014
by
thanvigandhi_1
1
answer
If the probability for A to fail in an examination is 0.2 and that for B is 0.3 then the probability that either A or B fails is
jeemain
math
cbse
class11
probability
axiomatic-approach-to-probability
medium
q12
asked
Jan 8, 2014
by
thanvigandhi_1
1
answer
An unbiased die with faces marked 1,2,3,4,5 and 6 is rolled four times out of four values obtained, the probability that the minimum face value is not less than 2 and the maximum face value is not greater than 5 is :
jeemain
math
cbse
class11
probability
random-experiements
easy
q34
asked
Jan 8, 2014
by
thanvigandhi_1
1
answer
If $0.5$ mole of $BaCl_2$ is mixed with 0.2 mole of $Na_3PO_4$,the maximum number of moles of $Ba_3(PO_4)_2$ that can be formed is :
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q39
easy
asked
Jan 8, 2014
by
sreemathi.v
1
answer
The weight of slaked lime required to decompose 8.0g $NH_4Cl$ is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
atomic-and-molecular-masses
q38
easy
asked
Jan 8, 2014
by
sreemathi.v
1
answer
Assuming fully decomposed,the volume of $CO_2$ released at STP,on heating 9.85g of $BaCO_3$ (at wt of Ba=137)will be:
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
laws-of-chemical-combinations
q37
easy
asked
Jan 8, 2014
by
sreemathi.v
1
answer
10 mole of $SO_2$ and 15 mole of $O_2$ were passed over catalyst to produce 8 mole of $SO_3$.The ratio of $SO_2$ and $SO_3$ moles in mixture is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q36
easy
asked
Jan 8, 2014
by
sreemathi.v
1
answer
How many moles of $KI$ are needed to produce 0.4moles of $K_2HgI_4$?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q35
easy
asked
Jan 8, 2014
by
sreemathi.v
1
answer
The mass of carbon anode consumed(giving only carbon dioxide) in the production of 270Kg of aluminum metal from bauxite by the Hall's process is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
laws-of-chemical-combinations
q34
easy
asked
Jan 8, 2014
by
sreemathi.v
1
answer
Which of following is a secondary standard
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
laws-of-chemical-combinations
q33
easy
asked
Jan 8, 2014
by
sreemathi.v
1
answer
Number of $K^+$ ions present in one litre of M/5 $KMnO_4$ solution are :
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q32
easy
asked
Jan 8, 2014
by
sreemathi.v
1
answer
$4I^-+Hg^{2+}\rightarrow HgI_4^{2-}$;1 mole each of $Hg^{2+}$ and $I^-$ will form _________ mole $HgI_4^{2-}$
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q31
easy
asked
Jan 8, 2014
by
sreemathi.v
1
answer
A sample of $MnSO_4.4H_2O$ is heated in air to give $Mn_3O_4$.The residue $Mn_3O_4$ is dissolved in 100ml of $N/10$ $FeSO_4$ containing $H_2SO_4$.The solution reacts completely with 50ml of $KMnO_4$.25ml of this $KMnO_4$ requires 30ml of N/10 $FeSO_4$ for complete oxidation.Determine the amount of $MnSO_4.4H_2O$ is the sample
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q41
difficult
asked
Jan 8, 2014
by
sreemathi.v
1
answer
1gm of $Fe_2O_3$ solid of 55.2% purity is dissolved in acid and reduced by heating the solution with Zn dust.The resultant solution is cooled and made up to 100ml,25ml of this solution requires 17ml of 0.0167M solution of an oxidant.Calculate the number of electrons taken up by the oxidant in the above reaction.
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q40
difficult
asked
Jan 8, 2014
by
sreemathi.v
1
answer
25ml of a solution containing HCl and $H_2SO_4$ required for neutralized 24.10ml of N/2 caustic soda solution.25ml of the same solution on precipitation with $BaCl_2$ yielded 0.5218gm $BaSO_4$.What wt of each acid is contained in one litre of the solution?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q39
difficult
asked
Jan 8, 2014
by
sreemathi.v
1
answer
$0.5gm$ of $H_2SO_4$(oleum) is diluted with water.This solution is completely neutralized by 26.4ml of 0.4N NaOH.Find the % of free $SO_3$ in the sample.
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q38
difficult
asked
Jan 8, 2014
by
sreemathi.v
1
answer
A sample of chalk $(CaCO_3)$ is contaminated with calcium sulphate $(CaSO_4)$ 1gm of the solid mixture is dissolved in 230ml of N/10 HCl; 40ml of N/10 NaOH is required to neutralize the excess of acid.Find the percentage of chalk in the mixture.
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q37
difficult
asked
Jan 8, 2014
by
sreemathi.v
1
answer
A mixture of FeO and $Fe_3O_4$ when heated in air to a constant weight,gains 5% of its weight,Find the composition of the initial mixture.
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
percentage-composition
q36
difficult
asked
Jan 8, 2014
by
sreemathi.v
1
answer
A mixture of Al and Zn weighing 1.67g was completely dissolved in acid and evolved 1.69litre of $H_2$ at NTP.What was the weight of Al in original mixture?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
laws-of-chemical-combinations
q35
difficult
asked
Jan 8, 2014
by
sreemathi.v
1
answer
The equation of the plane that meets the coordinate axes at the points $A,B,C$ respectively and the centroid of the $\Delta\:ABC$ is $(2,1,5)$ is ?
jeemain
math
class11
ch12
3d-geometry
coordinate-axes-and-planes
medium
q81
asked
Jan 7, 2014
by
rvidyagovindarajan_1
1
answer
1g sample of washing soda was dissolved in 50ml of 1.0M HCl.The excess acid required for neutralization 21.13ml of 1.018M $Ba(OH)_2$.Compute the degree of hydration of washing soda.
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q34
difficult
asked
Jan 7, 2014
by
sreemathi.v
1
answer
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