Transcript Answer

CHEMISTRY
 STOICHIOMETRY & COLLOIDS
 The equivalent mass of MnSO4 is half of its
molecular mass when it is converted into1. Mn2O3
2. KMnO4
3. MnO2
4. K2MnO4
Answer : - 3rd option
Mn2+ → Mn4+
 1.98 g of Zn displaces 1.92 g of copper from
CuSo4 solution. So the Equivalent mass of Zinc
is : - (Equivalent Mass of Cu = 31.8)
1. 32.79
2. 32.3
3. 65.5
Answer :-
4. 63.5
Option No 1
E=32.79
1.98 = E
1.92 31.8
 The element whose atom has a mass of
6.642 x 10 -26 Kg is –
1. Silver
2. Zinc
3. Calcium
4. Boron
Answer:- Option No3
Atomic Mass = Mass of atom x N4
= 6.642x10-26 x 6.022x1023
= 0.040 kg = 40 g
= at Mass of calcium = 40
The number of molecules in 16 g of methane is
1.3.0 x 1023
2. 6.022x1023
3. 16/6.022x 1023
4.
16
3.0 x 1023
Answer : - Option No 2
6.022x1023
19.7 kg of gold was recovered from a smuggler. So
the number of atoms of gold recovered is
( At . Mass of Au = 197)
1. 100
2. 6.022x1023
3. 6.022x1024
4. 6.022x1025
Answer : - Option No4
Assuming fully decomposed the volume of CO2
released at STP when 9.85 g of BaCo3 will be
( At Mass of Ba=137)
1. 0.84L
2. 2.24 L
3. 4.06L
4. 1.12L
Answer : - Option no 4
Baco3→Bao+Co2
197g→22.4 L
9.85g→? – 9.85x 22.4
197
= 1.12L
The Indicator used in titrating oxalic acid with
caustic soda solution is
1. Methyl Orange
2. Methyl Red
3. phenolphthalein
4. Diphenylamine
Answer : - Option No 3
If a Mixture containing 3 moles of Hydrogen and 1
mole of Nitrogen is converted completely into
ammonia, the ratio of initial and final volumes at the
same temperature and pressure would be
1. 1:2
2. 2:1
3. 1:3
4. 3:1
Answer : - Option no 2
N2+3H2→2NH3
4: 2 or 2:1
 The Molarity of a solution containing 5g of NaoH
in 250cm3 solution is
1. 0.5
2. 0.1
3. 3. 2
4. 4. 1
Answer : - Option No1
M = mass/dm3
G.mol. Mass
20 = 0.5
40
 The volume of water to be added to 100cm3 of
0.5N H2 SO4 to get decinormal solution is –
1. 400cm3
2. 500cm3
3. 450cm3
4. 100cm3
Answer : - Option no 1
N1V1 = N2V2 100x0.5 = V2 x0.1 i.e. V2=500cm3
Vol of water to be added 500-100= 400cm3
30g of Magnesium and 30g of oxygen are reacted
and the residual mixture contains
1. 60g of Mg only
2. 40g of MgO and 20g of O2
3. 45g of MgO and 15g of O2
4. 50g of MgO and 10g of O2
Answer : - Option number 4
2Mg +O2→2MgO
48g Mg reacts with 32g of O2
48g 32g
2x40g so that 30g Mg, 30x32 = 20g of O2
48
Mass of MgO = 30+20=50
Mass of unreacted O2 = 30 – 20=10
20 cm3 of 0.05N HCl and 35cm3 of 0.01N NaOH are
mixed. The resulting solution will be1.Be Neutral
2. Be basic
3. Turn phenolphthalein into pink
4. Turn methyl orange red
Answer : - Option number 4
When a small amount of FeCl3 is added to a freshly
precipitated Fe(OH)3, a reddish brown colloidal
solution is obtained. This phenomenon is know as1.Dialysis
2. Peptisation
3. Protection
4. Dissolution
Answer : - Option number 2
In the preparation of AgI solution, the excess of
potassium iodide solution is added to silver nitrate
solution. The colloidal solution will have
1.
Positive charge
2. Negative charge
3. No charge
4. Both positive and negative charge
Answer : - Option No 2
 In a colloidal system , total number of phases
is/are
1. One
2. Two
3. Three
4. Eight
Answer : - Option number 2
Colloidal particles carry some charge. This can be
show by
1.Electrophoresis
2. Dialysis
3. Tyndall effect
4. Brownian Movement.
Answer : - Option no 1
 A metallic oxide has formula MO, If the atomic
mass of the metal is 24. the Equivalent mass of the
metal is
1) 12.
2) 24.
3) 36.
4) 18.
Answer : - Option No1
 One mole of H2SO4 in a dm3 forms
1) 2N Solution.
2) IN Solution.
3) 0.105N Solution.
4) 0.25N Solution.
Answer : - Option No1
 The volume of 0.5N NaOH which neutralizes 6.3g
of oxalic acid crystals?
1)100cm3.
2)20cm3.
3)200cm3.
4)400cm3.
Answer : - Option No3
0.5NxV/1000=6.3/63
 Surface tension of hydrophilic sols is?
1) Lower than water. 2) Higher than water.
3) Equal to water.
4) Higher or lower than
water.
Answer : - Option No1
 Lyophillic sols are more stable than lyophobic sols
because?
1) The colloidal particles have positive charge.
2) The colloidal particles have no charge.
3) The colloidal particles are solvated.
4) There is strong electrostatic repulsion.
Answer : - Option No3
 Colloidal particles can be separated from
those of particles of molecular dimensions by
1) Dialysis.
2) Coagulation
3) Electrophoresis.
4) pyrolysis.
Answer : - Option No 1

An example of micelle is
1) Sodium stearate.
2) Gold sol.
3) Nacl Solution.
4) Ruby Glass.
Answer : - Option No1
 Gelatin is mostly used in making ice
creams in order to
1) Prevent making of a colloid.
2) Stabilize the colloid and prevent
crystallizations.
3) Develop a taste.
4) Enrich the aroma.
Answer : - Option No 2
 Cloud bursts due to
1) Attraction towards the electrical charge on
the earth.
2) Large amount of water present in the
cloud.
3) Dense cloud present in the upper
atmosphere.
4) Mutual discharge of oppositely charged
clouds resulting in the coagulation.
Answer : - Option No 4
 Gold numbers of Gelatin(I), Gum arabic (II),
egg albumin (III) are 0.005,0.20 and 0.18
respectively. Arrange these in decreasing
order of protective power.
1) I > II > III.
2) I > III > II.
3) II > III > I.
4) III > II > I.
Answer : - Option No 2
 Which of the following least effective in
causing flocculation of ferric hydroxide sol?
1) K4[Fe(CN)6]
2) Na2CrO4
3) KBr
4) Na2so4
Answer : - Option No 3
 The Method usually employed for the
destruction of a colloidal sol is
1) Addition of electrolytes.
2) Diffusion through animal
membrane.
3) Condensation
4) Dialysis.
Answer : - Option No 1
 Butter is a colloid formed when
1) Fat is dispersed in water.
2) Water is dispersed in fat.
3) Fat globules are dispersed in water and
milk.
4) Fat globules are dispersed in water and
curds.
Answer : - Option No 2
 If the dispersed phase is a liquid and the
dispersed medium is solid, the colloid is
known as a/an
1) Sol.
2) emulsion.
3) gel.
4) Foam.
Answer : - Option No 3
 In case of small cuts, bleeding is stopped by
applying potash alum, here alum acts as
1) Fungicide.
2) Disinfectant.
3) Germicide.
4) coagulating agent.
Answer : - Option No 4
 The simplest way to check whether a system
is colloidal is by
1) Tyndall effect.
2) Brownian movement.
3) Electro dialysis.
4) Finding out particle size.
Answer : - Option No 1
 A liquid is found to scatter a light beam but
leaves no residue on passing through the
filter paper.
1) a suspension.
2) An oil.
3) a colloidal sol.
4) a true solution.
Answer : - Option No 3
 Dialysis can separate
1) Glucose and Fructose.
2) Glucose and Sucrose.
3) Glucose and Nacl.
4) Glucose and protein.
Answer : - Option No 4