CHEMISTRY

1
CHEMISTRY

• STOICHIOMETRY COLLOIDS

2

• The equivalent mass of MnSO4 is half of its
  molecular mass when it is converted into-
• 1. Mn2O3
• 2. KMnO4
• 3. MnO2
• 4. K2MnO4
• 
  

• 
  
• Answer - 3rd option
• Mn2 ? Mn4

3

• 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
• 4. 63.5

• Answer - Option No 1
• E32.79
• 1.98 E
• 1.92 31.8

4
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 element whose atom has a mass of
• 6.642 x 10 -26 Kg is
• 1. Silver
• 2. Zinc
• 3. Calcium
• 4. Boron

5

• The number of molecules in 16 g of methane is
• 3.0 x 1023
• 6.022x1023
• 16/6.022x 1023
• 16
• 3.0 x 1023

• Answer - Option No 2
• 6.022x1023

6

• 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

7

• Assuming fully decomposed the volume of CO2
• released at STP when 9.85 g of BaCo3 will be
  
• ( At Mass of Ba137)
• 1. 0.84L
• 2. 2.24 L
• 3. 4.06L
• 4. 1.12L

• Answer - Option no 4
• Baco3?BaoCo2
• 197g?22.4 L
• 9.85g?? 9.85x 22.4
• 197
• 1.12L

8

• 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

9

• 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. 12
• 2. 21
• 3. 13
• 4. 31

• Answer - Option no 2
• N23H2?2NH3
• 4 2 or 21

10

• The Molarity of a solution containing 5g of NaoH
  in 250cm3 solution is
• 0.5
• 0.1
• 3. 2
• 4. 1

• Answer - Option No1
• M mass/dm3
• G.mol. Mass
• 20 0.5
• 40

11

• The volume of water to be added to 100cm3 of
  0.5N H2 SO4 to get decinormal solution is
• 400cm3
• 2. 500cm3
• 450cm3
• 4. 100cm3

• Answer - Option no 1
• N1V1 N2V2 100x0.5 V2 x0.1 i.e. V2500cm3
• Vol of water to be added 500-100 400cm3

12

• 30g of Magnesium and 30g of oxygen are reacted
  and the residual mixture contains
• 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 302050
• Mass of unreacted O2 30 2010

13

• 20 cm3 of 0.05N HCl and 35cm3 of 0.01N NaOH are
  
• mixed. The resulting solution will be-
• Be Neutral
• 2. Be basic
• 3. Turn phenolphthalein into pink
• 4. Turn methyl orange red

• Answer - Option number 4

14

• 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
  as-
• Dialysis
• 2. Peptisation
• 3. Protection
• 4. Dissolution

• Answer - Option number 2

15

• In the preparation of AgI solution, the excess of
  
• potassium iodide solution is added to silver
  nitrate
• solution. The colloidal solution will have
• Positive charge
• 2. Negative charge
• 3. No charge
• 4. Both positive and negative charge

• Answer - Option No 2

16

• In a colloidal system , total number of phases
  
• is/are
• One
• 2. Two
• 3. Three
• 4. Eight

• Answer - Option number 2

17

• Colloidal particles carry some charge. This can
  be
• show by
• Electrophoresis
• 2. Dialysis
• 3. Tyndall effect
• 4. Brownian Movement.

• Answer - Option no 1

18

• 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
19

• 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
20
0.5NxV/10006.3/63

• 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
21

• 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
22

• 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
23

• 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
24

• An example of micelle is
• 1) Sodium stearate.
• 2) Gold sol.
• 3) Nacl Solution.
• 4) Ruby Glass.

Answer - Option No1
25

• 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
26

• 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
27

• 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 gt II gt III.
• 2) I gt III gt II.
• 3) II gt III gt I.
• 4) III gt II gt I.

Answer - Option No 2
28

• Which of the following least effective in
• causing flocculation of ferric hydroxide
  sol?
• 1) K4Fe(CN)6
• 2) Na2CrO4
• 3) KBr
• 4) Na2so4

Answer - Option No 3
29

• 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
30

• 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
31

• 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
32

• 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
33

• 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
34

• 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
35

• Dialysis can separate
• 1) Glucose and Fructose.
• 2) Glucose and Sucrose.
• 3) Glucose and Nacl.
• 4) Glucose and protein.

Answer - Option No 4