Pre Video Test: Some Basic Concepts of ChemistryContact Number: 8527521718Pre Video Test: Some Basic Concepts of ChemistryContact Number: 85275217181 mole of equimolar mixture of ferric oxalate
and ferrous oxalate will require x mole of
KMnO4 in acidic medium for complete
oxidation, x is :
1. 0.5 mole
2. 0.9 mole
3. 1.2 mole
4. 4.5 mole.
A partially dried clay sample contained 50% of
silica and 7% of water. The original clay
contained 12% of water. Find the percentage of
silica in the original sample.
1. 40.7%
2. 47.3%
3. 45%
4. 51%
1.575 gm crystalline oxalic acid
diluted upto 250 ml. 25ml of this solution is
completely neutralised with 25ml N/10 NaOH.
The value of ‘x’ is
1. Zero
2. 1
3. 2
4. 5
2 gm Iron pyrite (FeS2) is burnt with O2 to form Fe2O3 and SO2. The mass of SO2 produced will be
(Fe = 56, S = 32, O = 16)
1. 2 gm
2. 2.13 gm
3. 4 gm
4. 4.26 gm
Which has maximum number of atoms at NTP?
1. 1 ml CH4
2. 1 ml N2
3. 1 ml H2
4. 1 ml H2O
10 g of a mixture of Cu2S and CuS is reacted
with 150 ml 1M KMnO4 producing Cu2+, Mn2+
and SO2. The excess of KMnO4 is completley
reacted with 175 ml 1M Fe2+ in acidic medium.
Percentage of CuS in the mixture will be
1. 37%
2. 47%
3. 57%
4. 67%
In Haber process 30 L of dihydrogen and 30L
of dinitrogen were taken for reaction which
yielded only 50% of the expected product. What
will be the composition of gaseous mixture
under the aforesaid conditions in the end ?
1. 20L of ammonia, 25L of nitrogen, 15L of hydrogen
2. 20 L of ammonia, 20L of nitrogen, 20L of
hydrogen
3. 10L of ammonia, 25L of nitrogen, 15L of hydrogen
4. 20L of ammonia, 10L of nitrogen, 30L of
hydrogen
What volume of 75% alcohol by weight
( d = 0.80 g/cm3) must be used to prepare 150
cm3 of 30 % alcohol by weight (d = 0.90 g/cm3)?
1. 67.5 mL
2. 56.25 mL
3. 44.44 mL
4. None of these
25 ml of a mixture of NaOH and Na2CO3 is titrated against N/10 HCl using phenolphthalin as an indicator then the volume of HCl used was 20 ml. Now same 25 ml of same mixture is titrated against N/10 HCl using methyl orange indicator then the volume of HCl used was 25 ml. Weight of NaOH in the mixture will be
1. 0.02 gm
2. 0.04 gm
3. 0.06 gm
4. 0.08 gm
25 ml of NaOH and Na2CO3 mixture is
titrated against N/10 HCl using methyl orange
indicator then the volume of HCl used was 25
ml. Weight of Na2CO3 in the mixture will be
1. 1.06 gm
2. 0.106 gm
3. 0.053 gm
4. 0.0265 gm
An impure sample of sodium oxalate (Na2C2O4)
weighing 0.20 g of dissolved in aqueous solution
of H2SO4 and solution is titrated at 70°C,
requiring 45 mL of 0.02 M KMnO4 solution. The
end point is overrun, and back titration in carried
out with 10 mL of 0.1 M oxalic acid solution. Find
the % purity of Na2C2O4 in sample
1. 75
2. 83.75
3. 90.25
4. None of these
Two elements X (at mass 160) and Y (at mass
14) combine to form compounds A, B and C. The
ratio of different masses of Y which combine with
a fixed mass of X in A, B and C is 1 : 3 : 5. If 32
parts by mass of X combine with 84 parts by
mass of Y in B, then in C, 16 parts by mass of X
will combine with
1. 14 parts of mass Y
2. 42 parts by mass Y
3. 70 parts by mass Y
4. 84 parts by mass Y
Calculate the weight of V2O5 produced from 2g
of VO and 5.75g of Fe2O3. (V =51, Fe = 56,
O = 16) VO + Fe2O3 FeO + V2O5
1. 2.18
2. 5.18
3. 3.18
4. 1.18
Crude calcium carbide is made in an electric
furnace by the following reaction:
CaO + 3C CaC2 + CO
The product contains 85% of CaC2 and 15% of
unreacted CaO. How much CaO is to be added
to the furnace charge for each 1000 kg of CaC2
(pure) produced?
1. 1051.5
2. 950
3. 1151.5
4. 1250.5
25 mL of mixed solution of Na2CO3 and NaHCO3
required 12 mL of N/20 HCl when titrated with
phenolphthalein as indicator. But 25 mL of the
same, when titrated seperately when methyl
orange required 30 mL of N/20 HCl. Calculate
the amount of Na2CO3 and NaHCO3 in grams
per litre.
1. 2.544, 1.008
2. 2.008, 1.544
3. 1.008, 2.544
4. 1.544, 2.008