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Recent questions in Some Basic concepts in Chemistry
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Chemistry
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Some Basic concepts in Chemistry
Given that the abundance of isotopes $^{54}Fe, ^{56}Fe$ and $^{56}Fe$ are $5 \%, 90 \%$ and $5 \%$ respectively, the atomic mass of $Fe$ is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
percentage-composition
medium
asked
Mar 21, 2014
by
meena.p
1
answer
The largest number of molecules is in
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
medium
asked
Mar 21, 2014
by
meena.p
1
answer
An aqueous solution of $6.3\;g$ oxalic acid dihydrate is made up to $250\;ml$ . The volume of $0.1\;N\; NaOH$ required to completely neutralize 10 ml of this solution is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
medium
asked
Mar 21, 2014
by
meena.p
1
answer
The normality of $0.3\;M$ phosphorous acid $(H_3P0_3) $ is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
easy
asked
Mar 21, 2014
by
meena.p
1
answer
When the same amount of zinc is treated separately with excess of sulphuric acid and excess of sodium hydroxide evolved is
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
laws-of-chemical-combinations
medium
asked
Mar 21, 2014
by
meena.p
1
answer
The total number of electrons in one molecule of carbon dioxide is
sat
chemistry
stoichiometry and the mole concept
jeemain
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
atomic-and-molecular-masses
easy
asked
Mar 21, 2014
by
meena.p
1
answer
The equivalent weight of $ MnSO_4$ is half its molecular weight when it is converted to
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
easy
asked
Mar 21, 2014
by
meena.p
1
answer
A molal solution is one that contains one mole of a solute in
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
easy
asked
Mar 20, 2014
by
meena.p
1
answer
The density of $3M$ solution of $Na_2S_2O_3$ is $1.25$ $g mL^{−1}$. Calculate the mole fraction of $Na_2S_2O_3$.
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q200
medium
asked
Feb 11, 2014
by
sharmaaparna1
1
answer
The density of 3M solution of $Na_2S_2O_3$ is 1.25 g $mL^{-1}$ Calculate the $\%$ by weight of $Na_2S_2O_3$.
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q199
medium
asked
Feb 11, 2014
by
sharmaaparna1
1
answer
$HNO_3$ used as a reagent has specific gravity of $1.42 mL^{-1}$ and contains $70\%$ by strength $HNO_3$. Calculate Volume of water required to make $1\;N$ solution from $2\; mL$ concentrated $HNO_3?\;(\text{Normality}_{HNO_3} = 15.78)$
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q197
medium
asked
Feb 11, 2014
by
sharmaaparna1
1
answer
$HNO_3$ used as a reagent has specific gravity of $1.42 mL^{-1}$ and contains $70\%$ by strength $HNO_3$. Calculate Volume of acid that contains 63g pure acid.
sat
chemistry
stoichiometry and the mole concept
jeemain
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q197
easy
asked
Feb 11, 2014
by
sharmaaparna1
1
answer
$HNO_3$ used as a reagent has specific gravity of $1.42 mL^{-1}$ and contains $70\%$ by strength $HNO_3$. Calculate Normality of acid
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q96
easy
asked
Feb 11, 2014
by
sharmaaparna1
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
$RH_2$(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
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
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
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
0.75 mole of solid $A_4$ and 2 mole of gaseous $O_2$ are heated to react completely in sealed vessel to produce only one gaseous compound B.After the compound is formed the vessel is brought to initial temperature,the pressure is found to half the initial pressure.What is molecular formula of compound?
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
mole-concept-and-molar-masses
q33
difficult
asked
Jan 7, 2014
by
sreemathi.v
1
answer
A mixture of KOH and $Na_2CO_3$ solution required 15ml of N/20 HCl using phenolphthalein as indicator .The same amount of alkali mixture when titrated using methyl orange as an indicator required 25ml of same acid.Calculate the amount of KOH and $Na_2CO_3$ present in solution.
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q32
difficult
asked
Jan 7, 2014
by
sreemathi.v
1
answer
Approximately 45.0litre of 4.360M HCl were required for several experiments.How many litre of concentrated acid (37.5% by wt HCl) will be required?The specific gravity of conc. acid was $1.1875gml^{-1}$
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q31
difficult
asked
Jan 7, 2014
by
sreemathi.v
1
answer
A solution contains 4g of $Na_2CO_3$ and NaCl 250ml.25ml of this solution required 50ml of N/10 HCl for complete neutralization.Calculate % composition of mixture.
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
percentage-composition
q30
difficult
asked
Jan 7, 2014
by
sreemathi.v
1
answer
$1.575g$ of oxalic acid $(COOH)_2XH_2O$ are dissolved in water and the volume made upto 250ml.On titration 16.68ml of this solution requires 25ml of N/15 NaOH solution for complete neutralization.
jeemain
chemistry
physical-chemistry
class11
unit1
some-basic-concepts-in-chemistry
stoichiometry
q29
difficult
asked
Jan 7, 2014
by
sreemathi.v
1
answer
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