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JEEMAIN and NEET
JEEMAIN and NEET
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A red solid is insoluble in water. However, it becomes soluble if some KI is added to water. Heating red solid in a test tube produces violet coloured fumes and droplets of metal appear on the cooler parts of test tube. The red solid is
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
Which of the following metal sulphides has maximum solubility in water?
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
When chlorine water is added to an aqueous solution of potassium halide in the presence of chloroform, a violet colour is obtained. On adding more of chlorine water, the violet colour disappears, and a colourless solution is obtained. This test confirms the presence of the following in aqueous solution.
jeemain
chemistry
practical-chemistry
medium
mock
asked
Feb 1, 2014
by
mosymeow_1
1
answer
Iodine reacts with $Na_2S_2O_3$ (aq) to give products which are
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
Lead has been placed in the group I and II because
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
Suspended impurities from a colloidal solution of gum in water can be removed by
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
Which of the following can be enthalpy of neutralisation of a weak acid and a strong base?
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
If enthalpy of neutralisation of $dil\; HCl$ and $NaOH\; (aq)$ is $x$ then enthalpy of neutralisation of dil HI and $Ba(OH)_2\; (aq)$ is
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
Which of the following precipitates $K^+$ from its solution?
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
Which of the following is insoluble in dil. $HNO_3$ but soluble in aqua regia?
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
When $H_2S$ is passed through an ammoniacal salt solution X, a white ppt. is obtained. Then X can be a
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
Distinguishing reagent between silver and lead salts
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
$H_2S$ in the presence of HCl precipitates group II but not group IV because
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
Concentrated nitric acid is added before proceeding to test for group III members. This is to
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
Mg is not precipitated in group V because
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
The ion that cannot be precipitated by both HCl and $H_2S$ is
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
Which of the following solution gives precipitate with $Pb(NO_3)_2$ but not with $Ba(NO_3)_2$ ?
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
An aqueous solution of salt gives white precipitate with $AgNO_3$ solution as well as with dil $H_2SO_4$. It may be
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
In a mixture having nitrite and nitrate can be destroyed by heating with
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
For the test of halides, the soda extract is acidified with
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
Formation of purple colour on the addition of sodium nitroprusside to sodium carbonate extract indicates the presence of
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
2
answers
A salt solution is acidified with dil. $HCl$ and $BaCl_2$ solution is added. A white ppt. is formed. The salt contains
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
Which one of the following cation will give a blue coloured ash when a piece of filter paper dipped in a solution containing its salt and $Co(NO_3)_2$ is burned?
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
$H_2S$ and $SO_2$ can be distinguished by
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
Acidified $K_2Cr_2O_7$ turns green by
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
An inorganic salt when heated evolves a coloured gas which bleaches moist litmus paper. The evolved gas is
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
Heating of oxalic acid with conc. $H_2SO_4$ gives
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
A test tube containing a nitrate and another containing a bromide and $MnO_2$ are treated with conc. $H_2SO_4$. The brown fumes evolved are passed through water. The water will be coloured by
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
When a salt is heated with dil $H_2SO_4$ and $KMnO_4$ solution, the pink colour of $KMnO_4$ is discharged, the mixture contains:
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
When borax is heated in a platinum loop, the transparent bead formed contains
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
The most suitable indicator for the titrations of $Ba(OH)_2$ against HI is
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
If $pK_{in}$ of an indicator is 10.5, the pH transition range for which it is most suitable is
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
The most suitable indicator for the titration of HCOOH against NaOH is
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
Completion of diazotisation can be checked with
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
$C_6H_5OH$ and $C_2H_5OH$ can be distinguished by
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
Which of the following compound will give blood red colour while doing the Lassigne's test for N?
jeemain
chemistry
practical-chemistry
medium
asked
Feb 1, 2014
by
mosymeow_1
1
answer
Karl - Pearson's coefficient of Skewness of a distribution is $0.4$ If SD is 6 and mean 40, then median of the distribution is
jeemain
math
cbse
class11
statistics
measures-of-dispersion-(median)
easy
q93
asked
Feb 1, 2014
by
thanvigandhi_1
1
answer
If SD of $X$ is $ \sigma $ then SD of $ \large\frac{aX+b}{c}$ ( where $a,b,c$ are constants ) is
jeemain
math
cbse
class11
statistics
variance-and-standard-deviation
difficult
q50
asked
Feb 1, 2014
by
thanvigandhi_1
1
answer
The average speed of a car running at the rate of 15 km/hr during the first 30 km at 20 km/hr during the second 30 km and at 25 km/hr during the third 30 km is
jeemain
math
cbse
measures-of-dispersion
class11
statistics
difficult
q49
asked
Feb 1, 2014
by
thanvigandhi_1
1
answer
For a perfect correlation between the variables $x$ and $y$ the line of regression is $ ax+by+c=0$ where $a,b,c > 0$ then $ r$ is
jeemain
math
cbse
class11
statistics
easy
analysis-of-frequency-distributions-(correlation-coefficient)
q92
asked
Feb 1, 2014
by
thanvigandhi_1
1
answer
Two regression lines intersect at
jeemain
math
cbse
class11
statistics
easy
analysis-of-frequency-distributions
q99
asked
Feb 1, 2014
by
thanvigandhi_1
1
answer
If an experiment with 15 observations on $x$ the following results were available: $\Sigma x^2=2830 \: \Sigma x = 170$. One observation that was 20 was found to be wrong and was replaced by the correct value 30. The corrected variance is
jeemain
math
cbse
class11
statistics
variance-and-standard-deviation
difficult
q48
asked
Feb 1, 2014
by
thanvigandhi_1
1
answer
In a college of 300 students every student reads 5 newspapers and every newspaper is read by 60 students. The number of newspaper is
jeemain
math
cbse
class11
statistics
difficult
analysis-of-frequency-distributions
q47
asked
Feb 1, 2014
by
thanvigandhi_1
1
answer
For $a$ bivariate distribution $(x,y)$ if $ \Sigma x = 50 \: \Sigma y = 60 \: \Sigma xy = 350 \: \overline x = 5\: \overline y = 6 \: var \: x=4\: var \: y=9\: then \: r(x,y)=$
jeemain
math
cbse
class11
statistics
analysis-of-frequency-distributions-(coefficient-correlation)
difficult
q46
asked
Feb 1, 2014
by
thanvigandhi_1
1
answer
If two random variables $x$ and $y$ are connected by the relation $ 2x+y=3$ then $ r_{xy} = $
jeemain
math
cbse
class11
statistics
analysis-of-frequency-distributions-(coefficient-correlation)
difficult
q46
asked
Feb 1, 2014
by
thanvigandhi_1
1
answer
$cov (x,y) $ if $ \Sigma x = 55\: \Sigma y = 82\: \Sigma xy = 565\: n=8$ is
jeemain
math
cbse
class11
statistics
analysis-of-frequency-distributions-(coefficient-correlation)
difficult
q44
asked
Feb 1, 2014
by
thanvigandhi_1
1
answer
If $b_{yx} = \large\frac{1}{2}$ and $b_{xy} = \large\frac{2}{3}$ and $ \theta$ is the acute angle between the two regression lines then $ \tan \theta$ =
jeemain
math
cbse
class11
statistics
analysis-of-frequency-distributions
difficult
q43
asked
Feb 1, 2014
by
thanvigandhi_1
1
answer
The dissociation energy of $H_2$ is 430.53 KJ$mol^{-1}$. If $H_2$ is exposed to radiation energy of wavelength 253.7nm, what % of radiant energy will be converted into kinetic energy ?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
difficult
q158
asked
Feb 1, 2014
by
sharmaaparna1
1
answer
A certain dye absorbs light of $\lambda = 4530 A^{\large\circ}$ and then fluorescence light of $5080 \;A^{\large\circ}$ Assuming that under given conditions $47\%$ of the absorbed energy is re-emmited out as fluorescence, Calculate the ratio of Quantum emitted out to the no. of quanta absorbed
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
quantum-mechanical-model
difficult
q157
asked
Feb 1, 2014
by
sharmaaparna1
1
answer
$O_2$ undergoes photochemical dissociation into one normal oxygen atom and one oxygen atom, 1.967 eV more energetic than normal. The dissociation of $O_2$ into two normal atoms of oxygen requires 498 KJ$mol^{-1}$.what is the maximum wavelength effective for photochemical dissociation of $O_2$ ?
jeemain
chemistry
physical-chemistry
class11
unit2
atomic-structure
bhor's-model
q156
difficult
asked
Feb 1, 2014
by
sharmaaparna1
1
answer
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