Concentration Terms

Q. 4. With 63 gm of oxalic acid how many litres of N/10 solution can be preoared (1) 100 litre (2) 10 litre (3) 1 litre (4) 1000 litre

Q. 20.3 g sample of pure MgCl2.xH2O on heating forms 10.8 g water and anhydrous MgCl2. The value of x is (Molar mass of MgCl2 = 95)

Q. the gaseous mixture of H2 and CO2 gas contains 66 mass% of CO2 . find the vapour density of the mixture

Q. 19. Formula mass of NaCl is 58.5 g/mol and density of its pure form is 2.167 g/cm3. The averagedistance between adjacent Na\ast and Cl ions in the crystal is 2.814 x 10-8 cm. Calculate the valueof Avogadros number.

Q. at the equilibrium of the reaction ; N2O4 - 2 NO2 the observed molecular weight of N2O4 is 80 g /mol at 350K. The percentage of dissociation of N2O4 at 350 K is ? a.10% b.15% c.20% d.18%

Q. A certain amount of a metal whose equivalent mass is 28 displaces 0.7 L of H2 at s.t.p from an acid hence mass of the element is

Q. 1. If we assume 1/24th part of mass of carbon instead of 1/12th part of it as 1 amu , then mass of 1 mole of a substance will :A) remain changedB) get doubledC) get halvedD)cant be predicted

Q. 35. Find the number of moles of electron 64g of CH_4

Q. 17. If the weight of metal oxide is x g containing y g of oxygen, the equivalent weight of metal will be

Q.

An empty container was filled with equal masses of methane and hydrogen gases. The fraction of total pressure exerted by hydrogen is____.

1. 1/2

2. 8/9

3. 1/9

4. 16/17

Q. 24.Calculate the equivalent weight of KI in given reaction: CuSO4+KI->Cu2I2+K2SO4+I2

Q. In rxn X + Y ----> 2Z 2mole of X, 1 mole of Y, 1mole of Z are placed in 10 litre vessel. Allowed to reach equilibrium. If final concentration of Z is 0.2M, then Kc for given rxn is 1)1.60 2)80/3 3)16/3 4)45

Q.

Partial pressures of $A,B,C$ and $D$ on the basis of gaseous system

$A+2B$ $\rightleftharpoons$ $C+3D$ are $A=0.20;B=0.10;C=0.30$ and $D=0.50atm$. The

numerical value of equilibrium constant is

1. 11.25

2. 18.75

3. 5

4. 3.75

Q. One litre of 1 molar $H_{2}S{O}_4$ solution has been diluted by 5 litre water, the normality of the solution is

1. 0.2N
2. 5N
3. 10N
4. 0.33N

Q. 10. If the weight of metal chloride is x gram containing y gram of metal the equivalent weight of metal will be?

Q.

For the reaction 2NaN₃(s) → 2Na(s) + 3N₂ (g), how many moles of sodium azide (NaN₃) must react in order to produce 8.75 moles of nitrogen gas?

1. 5.83 moles NaN₃

2. 13.1 moles NaN₃

3. 2.00 moles NaN₃

4. 2.50 moles NaN₃

Q.

In the mixture of $NaHC{O}_3$ and $N{a}_{2}C{O}_3$ volume of a given HCl required is 'x' ml with phenolphthalein indicator and further 'y' ml required with methyl orange indicator. Hence volume of $HCl$ for complete reaction of $NaHC{O}_3$ is

1. 2x

2. y

3. x/2

4. (y - x)

Q. 10. In alkaline medium KMnO4 reacts as follows: 2KMnO4 + 2KOH - 2K2MnO4+H2O + O2. therefore its equivalent mass will be : (1)31.6 (2)52.7(3)79 (4)158

Q. 29 In the reaction of sodium thiosulphate with I2 in aqueous medium the equivalent weight of sodium thiosulphate is equal to 1) Molar mass of sodium thiosulphate 2) the average of molar masses of Na2S2O3 and I2 3) half the molar mass of sodium thiosulphate 4) molar mass of sodium thiosulphate 2

Q. The Equivalent weight of bivalent metal is 32.7 .Molecular weight of its chloride is:

Q. 61.1 gram of metal nitrate gave 0.86g of metal sulphate . Then equivalent weight of metal is

Q. Calculate molality of 2.5 g of ethanoic acid $\left[C{H}_{3}COOH\right]$ in 75 g of benzene.

1. $0.551molk{g}^{-1}$
   
2. $0.556molk{g}^{-1}$
   
3. $0.558molk{g}^{-1}$
   
4. $0.552molk{g}^{-1}$

Q. Determine the molecular mass of an oxide of iron in which the mass percent of iron and oxygen are 69.9 and 30.1 respectively.

Q. 45. Mole fraction of methanol is 4.5 what is molality in aqueous solution

Q. The equivalent weight of metal chloride will be if equivalent weight of its oxide is 24 Options: a- 15.5 b- 51.5 c- 35.5 d- 71

Q. 17. The amount of NaOH required to neutralise 1500 cm3 of 0.1 N HCl is

Q. 17 31 g of phosphorus P4 and 32 g of oxygen are completely converted into P4O6 and P4O10 respectively, then moles of P4O6 and P4O10 formed respectively will be ??

Q. At 273 K, the density of a gaseous oxide at 2 bar is same as that of nitrogen at 5 bar. Calculate the molar mass of oxide.

Q. How many moles of Mg3(PO4)2 will contain 0.25 moles of oxygen atom?

Q. 23. In the reaction Fe2S3 > Fe2SO4 + SO2 What is the equivalent mass of Fe2S3?