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Recent questions tagged some-basic-concepts-in-chemistry

A molal solution is one that contains one mole of a solute in

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 $Na_2S_2O_3$.

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 $Na_2S_2O_3$.

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 $HNO_3?\;(\text{Normality}_{HNO_3} = 15.78)$

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.

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

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 :

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?

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)

asked Jan 9, 2014 by sreemathi.v

1 answer

Insulin contains 3.4% sulphur.The minimum mol weight of insulin is :

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?

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?

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

asked Jan 9, 2014 by sreemathi.v

1 answer

Number of $H^+$ ions in 100ml of 0.001M $H_2SO_4$ is

asked Jan 9, 2014 by sreemathi.v

1 answer

Which does not change on dilution?

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:

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?

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 :

asked Jan 8, 2014 by sreemathi.v

1 answer

Amount of oxygen required for complete combustion of 27g Al is

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

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

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 :

asked Jan 8, 2014 by sreemathi.v

1 answer

The weight of slaked lime required to decompose 8.0g $NH_4Cl$ is

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:

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

asked Jan 8, 2014 by sreemathi.v

1 answer

How many moles of $KI$ are needed to produce 0.4moles of $K_2HgI_4$?

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

asked Jan 8, 2014 by sreemathi.v

1 answer

Which of following is a secondary standard

asked Jan 8, 2014 by sreemathi.v

1 answer

Number of $K^+$ ions present in one litre of M/5 $KMnO_4$ solution are :

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 $HgI_4^{2-}$

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

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.

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?

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.

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.

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.

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?

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.

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?

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.

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 $1.1875gml^{-1}$

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.

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.

asked Jan 7, 2014 by sreemathi.v

1 answer

A sample containing 0.4775g of $(NH_4)_2C_2O_4$ and inert materials was dissolved in water and made strongly alkaline with KOH ,which converted $NH_4^+$ to $NH_3$.The liberated ammonia was distilled into exactly 50.0ml of 0.05035M $H_2SO_4$.The excess $H_2SO_4$ was back titrated with 11.3ml of 0.1214M $NaOH$.Calculate percent of N,percent of $(NH_4)_2C_2O_4$.(Mol.wt of $(NH_4)_2C_2O_4=124.10$ and at .wt.of N=14.0078)

asked Jan 7, 2014 by sreemathi.v

1 answer

$2.0g$ of a mixture of carbonate ,bicarbonate and chloride of sodium on heating produced 56ml of $CO_2$ at NTP 1.6g of the same mixture required 25ml of 1N HCl solution for neutralization.Calculate percentage of each component present in mixture

asked Jan 7, 2014 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=98$gmol^{-1}$) by mass will be

asked Jan 7, 2014 by sreemathi.v

1 answer

A drop (0.05ml) of 12M HCl is spread over a thin sheet of aluminum foil (thickness 0.10mm and density of Al=2.70g/ml).Assuming whole of the HCl is used to dissolve Al,what will be the maximum area of hole produced in foil?

asked Jan 7, 2014 by sreemathi.v

1 answer

Calculate molality of 1 litre solution of $93\%$ $H_2SO_4$ by volume.The density of solution is $1.84\; g$ $mL^{-1}$

asked Jan 7, 2014 by sreemathi.v

1 answer

A 6.90M solution of KOH in water has 30% by weight of KOH. Calculate the density of the solution.

asked Jan 7, 2014 by sreemathi.v

1 answer

A piece of Al weighing $2.7g$ is titrated with $75\;ml$ of $H_2SO_4$ (specific gravity = $1.18gmL^{-1}$ and $24.7%$ $H_2SO_4$ by weight). After the metal is completely dissolved, the solution is diluted to $400\;ml$. Calculate molarity of free $H_2SO_4$ in solution.

asked Jan 7, 2014 by sreemathi.v

1 answer

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