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JEEMAIN and NEET
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A plant virus is found to consist of uniform cylindrical particles of 150A in diameter and 5000A long.The specific volume of the virus is $0.75cm^3/g$.If the virus is considered to be a single particle and its molecular weight
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
atomic-and-molecular-masses
q19
easy
asked
Oct 30, 2013
by
sreemathi.v
1
answer
Find the number of g-molecules of oxygen in $6.023\times 10^{24}$ CO molecules
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q18
easy
asked
Oct 30, 2013
by
sreemathi.v
1
answer
Calculate the mass of $CaO$ that shall be obtained by heating 20 kg of 80 % pure lime-stone $(CaCO_3)$
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
law-of-chemical-combination
q17
easy
asked
Oct 30, 2013
by
sreemathi.v
1
answer
$H_2O_2$ is marked 22.4 volume.How much of it is required to oxidize 3.5g $H_2S$ gas ?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q88
medium
asked
Oct 30, 2013
by
sreemathi.v
1
answer
How many moles of electron weigh one kilogram ?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q87
medium
asked
Oct 30, 2013
by
sreemathi.v
1
answer
The density (in $gml^{-1})$ of a 3.60M sulphuric acid solution that is 29% $H_2SO_4$ (Molar mass=$98gmol^{-1})$ by mass will be :
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q86
medium
asked
Oct 30, 2013
by
sreemathi.v
1
answer
In the reaction $2Al(s)+6HCl(aq)\rightarrow 2Al^{3+}(aq)+6Cl^{-1}(aq)+3H_2(g)$
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q85
medium
asked
Oct 30, 2013
by
sreemathi.v
1
answer
Density of a 2.05M solution of acetic acid in water is 1.02 g/mL. The molality of the solution is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q84
medium
asked
Oct 30, 2013
by
sreemathi.v
1
answer
How many EDTA (ethylene diamine tetracetic acid)molecules are required to make an octahedral complex with a $Ca^{2+}$ ion ?
sat
chemistry
stoichiometry and the mole concept
jeemain
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q16
easy
asked
Oct 30, 2013
by
sreemathi.v
2
answers
How many moles of magnesium phosphate $Mg(PO_4)_2$ will contain 0.25 mole of oxygen atom ?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q83
medium
asked
Oct 30, 2013
by
sreemathi.v
1
answer
If $\large\frac{1}{6}$, in place of $\large\frac{1}{12}$ mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will :
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q82
medium
asked
Oct 30, 2013
by
sreemathi.v
1
answer
The points with position vectors $60\hat i+3\hat j,\:70\hat i-8\hat j\:and\:a\hat i-52\hat j$ are collinear if $a=?$
jeemain
math
class12
ch10
vector-algebra
easy
vector-product
q8
asked
Oct 29, 2013
by
rvidyagovindarajan_1
1
answer
$[\overrightarrow a\:\:\overrightarrow b\:\:\overrightarrow a\times\overrightarrow b]$=?
jeemain
math
class12
ch10
vector-algebra
easy
vector-product
q7
asked
Oct 29, 2013
by
rvidyagovindarajan_1
1
answer
If $ABCD$ is a Rhombus, with position vectors of vertices,$\overrightarrow {OA},\:\overrightarrow {OB},\:\overrightarrow {OC}\:and\:\overrightarrow {OD}$, then $\overrightarrow {OA}+\overrightarrow {OB}+\overrightarrow {OC}+\overrightarrow {OD}=?$
jeemain
math
class12
ch10
vector-algebra
medium
addition-of-vectors
q6
asked
Oct 29, 2013
by
rvidyagovindarajan_1
1
answer
Two solution of a substance (non-electrolyte) are mixed in the following manner,480ml of 0.5M of first solution with 520 ml of 1.2m of second solution.The molarity of final solution is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q81
medium
asked
Oct 29, 2013
by
sreemathi.v
1
answer
$3.92g$ of ferrous ammonium sulphate crystals are dissolved in 100ml of water.20ml of this solution requires 18ml of potassium permanganate during titration for complete oxidation .The weight of $KMnO_4$ present in one litre of the solution is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q80
medium
asked
Oct 29, 2013
by
sreemathi.v
1
answer
$8g$ of sulphur are burnt to form $SO_2$,which is oxidized by $Cl_2$.The solution is treated with $BaC_2$ solution.The amount of $BaSO_4$ percipitated is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q79
medium
asked
Oct 29, 2013
by
sreemathi.v
1
answer
Consider the decomposition reaction of nitroglycerine $4C_3H_5N_3O_9\rightarrow 6N_2+12CO_2+10H_2O+O_2$. If $200g$ nitroglycerine gives 6.55g $O_2$, then percent yield of the reaction is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
percentage-composition
q78
medium
asked
Oct 29, 2013
by
sreemathi.v
1
answer
$100\;mL$ of a mixture of $NaOH$ and $Na_2SO_4$ is neutralized by $10\;mL$ of $0.5\;M$ $H_2SO_4$. Hence $NaOH$ in $100\;mL$ solution is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q77
medium
asked
Oct 29, 2013
by
sreemathi.v
1
answer
Volume of 2m HCl required to neutralize the solution containing 1 mole of $NH_4Cl$ and $1$ mole of NaOH is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q76
medium
asked
Oct 29, 2013
by
sreemathi.v
1
answer
Mole fraction of $I_2$ in $C_6H_6$ is 0.2.The molality of $I_2$ in $C_6H_6$ is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q75
medium
asked
Oct 29, 2013
by
sreemathi.v
1
answer
The mole fraction of the solute in one molar aqueous solution is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q74
medium
asked
Oct 29, 2013
by
sreemathi.v
1
answer
3.0mole NaOH solution has a density of 1.110g/ml.The molarity of the solution is
sat
chemistry
stoichiometry and the mole concept
jeemain
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q73
medium
asked
Oct 29, 2013
by
sreemathi.v
1
answer
Molarity of $H_2SO_4$(density 1.8g/ml) is 18m.The molality of this $H_2SO_4$ is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q72
medium
asked
Oct 29, 2013
by
sreemathi.v
1
answer
If $30ml$ of $H_2$ and $20ml$ of $O_2$ react to form water,what is left at the end of the reaction
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q71
medium
asked
Oct 29, 2013
by
sreemathi.v
1
answer
The dehydration yield of cyclohexanol to cyclohexene is 75%.What would be the yield if 100g of cyclohexanol is dehydrated?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q70
medium
asked
Oct 29, 2013
by
sreemathi.v
1
answer
The no of moles of $KMnO_4$ that will be needed to react with one mole of sulphite ion in acidic solution
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q69
medium
asked
Oct 29, 2013
by
sreemathi.v
1
answer
A solution is 0.5m in $MgSO_4$,0.1M $Alcl_3$ and 0.2M in $(NH_4)_2SO_4.$The total ionic strength is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q68
medium
asked
Oct 29, 2013
by
sreemathi.v
1
answer
The total ionic strength (total molarity of all ions) Containing 0.1m of $CuSO_4$ and 0.1m of $Al_2(SO_4)_3$ is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q67
medium
asked
Oct 29, 2013
by
sreemathi.v
1
answer
The molality of 1 litre solution with $X\%$ by weight $H_2SO_4$ is equal to 9.The weight of the solvent present in the solution is 910g.The value of $X$ :
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q66
medium
asked
Oct 29, 2013
by
sreemathi.v
1
answer
$(\hat i\:\hat j\:\hat k)+(\hat j\:\hat k\: \hat i)+(\hat k\:\hat j\:\hat i)=?$
jeemain
math
class12
ch10
vector-algebra
easy
addition-of-vectors
q5
asked
Oct 28, 2013
by
rvidyagovindarajan_1
1
answer
If $\theta$ is the angle between the vectors $\overrightarrow a$ and $\overrightarrow b$, and $ |\overrightarrow a.\overrightarrow b|=|\overrightarrow a\times\overrightarrow b|$, then $\theta$=?
jeemain
math
class12
ch10
vector-algebra
easy
vector-product
q4
asked
Oct 28, 2013
by
rvidyagovindarajan_1
1
answer
If $|\overrightarrow a|=2,\:|\overrightarrow b|= 3$ and $\overrightarrow a.\overrightarrow b=4$, then $|\overrightarrow a-\overrightarrow b|$=?
jeemain
math
class12
ch10
vector-algebra
medium
vector-product
q3
asked
Oct 28, 2013
by
rvidyagovindarajan_1
1
answer
If $\overrightarrow a$ is a non zero vector with magnitude $a$ and $\lambda a$ is a non zero scalar then $\lambda\overrightarrow a$ is a unit vector if $\lambda=?$
jeemain
math
class12
ch10
vector-algebra
medium
multiplication-by-a-scalar
q2
asked
Oct 28, 2013
by
rvidyagovindarajan_1
1
answer
Which of one of the following is a vector?
jeemain
math
class12
ch10
vector-algebra
easy
types-of-vectors
q1
asked
Oct 28, 2013
by
rvidyagovindarajan_1
1
answer
A student is allowed to select at the most n books from a collection of $2n+1$ books. The no. of ways in which he can select at least one book is 63, then $n$ = ?
jeemain
math
class11
ch8
binomial-theorem
properties-and-applications
medium
asked
Oct 28, 2013
by
rvidyagovindarajan_1
1
answer
If sea water contains 63ppm $NO_3^{-1}$ and its density is 1.01g/ml,the approximate molarity of sea water is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q65
medium
asked
Oct 28, 2013
by
sreemathi.v
1
answer
The molality of 1M solution of NaCl (specific gravity $1.0585g/ml$) is :
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q15
easy
asked
Oct 28, 2013
by
sreemathi.v
1
answer
The amount of $H_2SO_4$ present in 1200ml of 0.1m solution is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q64
medium
asked
Oct 28, 2013
by
sreemathi.v
1
answer
Consider the following reaction: $2NH_3(g)+CO_2(g)\rightarrow (NH_2)_2CO(aq)+H_2O(l)$. If $637.2\;g$ $NH_3$ and $1142\;g$ $CO_2$ are allowed to react, then which one is the limiting reagent ?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q14
difficult
asked
Oct 28, 2013
by
sreemathi.v
1
answer
Total number of atoms present in $1.0cm^3$ of solid urea (density 0.3g/$cm^3$) at $25^{\large\circ}$ are
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q13
easy
asked
Oct 28, 2013
by
sreemathi.v
1
answer
If molecular weight of glucose-1-phosphate is 260 and its density is 1.5g $cm^{-3}$ ,what is the average volume occupied by 1 molecule of this compound ?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q63
medium
asked
Oct 28, 2013
by
sreemathi.v
1
answer
A gaseous alkane was exploded with oxygen.The volume of $O_2$ for complete combustion to $CO_2$ formed was in the ratio of 7 : 4.The molecular formula of alkane is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q62
medium
asked
Oct 28, 2013
by
sreemathi.v
1
answer
Amount of oxygen required for combustion of 1kg of a mixture of butane and isobutane is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q61
medium
asked
Oct 28, 2013
by
sreemathi.v
1
answer
To neutralize completely 20ml of 0.1m aqueous solution of phosphorus $(H_3PO_3)$ acid the volume of 0.1m aqueous KOH solution required is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q60
medium
asked
Oct 28, 2013
by
sreemathi.v
1
answer
$6.02\times 10^{20}$ molecules of urea are present in 100ml solution.The concentration of urea solution is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q59
medium
asked
Oct 28, 2013
by
sreemathi.v
1
answer
25ml of a solution of barium hydroxide titration with 0.1molar solution of hydro-chloric acid gave a titre value of 35ml.The molarity of barium hydroxide is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q58
medium
asked
Oct 28, 2013
by
sreemathi.v
1
answer
What volume of hydrogen gas at 273K and 1atm pressure will be consumed in obtaining 21.6g of element boron (at.mass=0.8) from the reduction of boron trichloride with hydrogen ?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q57
medium
asked
Oct 28, 2013
by
sreemathi.v
1
answer
In compound $C,H,N$ atoms are present in 9 : 1 : 35 by weight .Molecular weight of compound is 108.It molecular formula is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q56
medium
asked
Oct 28, 2013
by
sreemathi.v
1
answer
Which of the following changes with increases in temperature?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q12
easy
asked
Oct 28, 2013
by
sreemathi.v
1
answer
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