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Solutions, colloids & bsics of Organic chemistry

Total questions: 100

Worksheet time: 2hrs 24mins

Name
Class
Date
1.

Molal boiling point elevation constant is the ratio of the elevation in boiling point to

a)

Molarity

b)

Normality

c)

Molality

d)

Mole fraction

2.

Which one of the following aqueous solutions will have the lowest freezing point

a)

0.1 molal CaCl2

b)

0.1 molal NaCl

c)

0.1 molal FeCl3

d)

0.1 molal glucose

3.

What type of deviation from Rault's law shows a solution of acetone and CS2

a)

All of the mentioned

b)

Negative deviation

c)

No deviation

d)

Positive deviation

4.

Solutions of the follwing compounds, all qt the same molality were prepared, which solution has the lowest freezing point

a)

KBr

b)

Al(NO3)3

c)

CH3COONa

d)

MgCl2

5.

Which one of the following is true about the magnitude of Kb

a)

Kb is independent of the nature or concentration of the solute

b)

Kb depends on the nature of the solvent

c)

Kb is independs of the nature of the solvent

d)

All of the above

6.

The freezing point of a solvent on addition of a solute will

a)

Increase

b)

Decrease

c)

No change

d)

None of above

7.

According to the Henry's law, at a fixed temperature, amount of a gas dissolved in a given quantity of solvent is proportional to the

a)

Partial pressure of the gas above the solution

b)

Partial pressure of the solvent

c)

Total pressure of the solvent

d)

Partial pressure of a gascin a solution

8.

Which one of the following is an example of lyophilic sols in water

a)

Dispersion of gold

b)

Sulphur in water

c)

Protein

d)

Fe(OH)3

9.

The stability of lyophobic sols is due to their

a)

Electric charge

b)

Precipitation

c)

hgh hydration

d)

Ekectric charge & high hydration

10.

The movement of electrically charged particles under the influence of an applied electric field is called

a)

Electro-osmosis

b)

Electro-dialysis

c)

Electrophoresis

d)

Dialysis

11.

Which of the following ions have higher precipitating power fir precipitating As2S3 sol

a)

Na+

b)

Al3+

c)

Ba2+

d)

K+

12.

The protecting power of different colloids is measured in terms of

a)

Precipitating power

b)

Precipitation value

c)

Gold number

d)

Concentrartion

13.

Fog is an example of which type of colloidal system?

a)

Gas in liquid

b)

Solid in gas , Liquid in gas

c)

Gas in gas

d)

Liquids in gas

14.

Which of the following properties of colloids does not depend on the charge on particles?

a)

Electro-osmosis

b)

Electrophoresis

c)

Tyndall effect

d)

Coagulation

15.

This method is commonly used for destruction of colloid

a)

Addition of electrolytes

b)

Filtration by animal membrane

c)

Condensation

d)

Dialysis

16.

Which of the following compounds form micelles, if their concentration is increased in aqueous solution?

(a) Urea

(b) Glucose

(c)

a)

Pyridinium chloride

b)

Dodecyl trimethyl ammonium chloride

c)

Fructose

d)

Glucose

17.

The diameter of particles in colloidal system is

a)

10-9 m to 10-6 m

b)

10-7 m to 10-5 m

c)

10-12 m to 10-9 m

d)

10-10 m to 10-4 m

18.

. The position occupied by non-polar hydrophobic and polar hydrophilic group in a micelle is

a)

non-polar towards the outside and polar towards inside

b)

both distributed throughout

c)

both present only at the surface

d)

polar towards the outside and non-polar towards inside

19.

Which of the following form of colloid is considered to be the strongest colloid?

a)

Gel

b)

Solid sol

c)

Liquid sol

d)

Foam

20.

A colloidal system is made up of number of phasees

a)

1

b)

2

c)

3

d)

Many

21.

A system in which dispersed phase as well as dispersion medium are both liquids is called

a)

Gel

b)

Sol

c)

aerosol

d)

Emulsion

22.

The orbitals providing the most efficient overlap are

a)

s-s

b)

sp-sp

c)

sp2-sp2

d)

sp3-sp3

23.

Which one of the following is least basic

a)

NH3

b)

(CH3)3N

c)

C6H5NH2

d)

CH3NH2

24.

The polarization of s bond induced by an adjacent polar bond through sigma bond is called

a)

Resonance effect

b)

Inductive effect

c)

Hyperconjugation

d)

Steric effect

25.

Which one of the following is not a conjugated molecule

a)

Cyclohexene

b)

Acetamide

c)

Phenol

d)

Benzene

26.

Which one of the following is not electron-withdrawing inductive effect

a)

COR

b)

Cl

c)

CH2R

d)

OH

27.

Which one of yhe following free carbocation is the most stable

a)

(CH3)2 CH+

b)

C+H3

c)

CH3C+H2

d)

(CH3)3 C+

28.

Which one if the following acids is the strongest acid

a)

CH3COOH

b)

ClCH2COOH

c)

F3CCOOH

d)

Cl3CCOOH

29.

Which one of the following is not a conjugated unsaturated system

a)

Allyl radical

b)

Allyl cation

c)

1,3-butadiene

d)

1-penten-4-yne

30.

The equilibrium of two readily interconvertable isomwrs is called

a)

Stereoisomerism

b)

Tautomerism

c)

Metamerism

d)

Polymorphism

31.

Which of the following form of colloid is considered to be the lightest colloid?

a)

Gaseous foam

b)

Sol

c)

Emulsion

d)

Surfactant

32.

sucrose on hydrolysis gives

a)

glucose and galactose

b)

glucose and mannose

c)

lactose and mannose

d)

glucose and fructose

33.

Which one of the following is an example for reducing sugar

a)

sucrose

b)

glucose

c)

starch

d)

cellulose

34.

Chemical substances used to reduce body temperature

a)

Analegesic

b)

Antipyretic

c)

Anaesthetic

d)

Antitussive

35.

Isoelectric point of glycine is

a)

10

b)

6

c)

2

d)

4

36.

An example of condensation polymer

a)

polythene

b)

PVC

c)

polypropene

d)

Bakelite

37.

Grignard reagent on reaction with HCHO give

a)

10alcohol

b)

20alcohol

c)

acid

d)

30alcohol

38.

The reagent used for substitution at allylic position

a)

NaBH4

b)

LiAlH4

c)

NBS

d)

SeO2

39.

The stability of carbocation follows the order:

a)

Primary> Secondary>Tertiary> Methyl

b)

Secondary>Tertiary> Primary> Methyl

c)

Tertiary > Secondary> Primary > Methyl

40.

The change in hybridization affects electronegativity of carbon. Arrange C(sp3), C(sp2) and C(sp) in the increasing order of electronegativity.

a)

C(sp3)<C(sp2) <C(sp)

b)

C(sp3)< C(sp) <C(sp2)

c)

C(sp)< C(sp2) <C(sp3)

41.

Carbocations have ------------- shape with positively charged carbon being sp2 hybridised.

a)

Tetrahedral

b)

Trigonal planar

c)

linear

42.

Carbon has 4 valence electrons. What is the valence configuration?

a)

1s2 p2

b)

2s2 p2

c)

3s2 p2

d)

4s2 p2

43.

Electrophiles are electron seeking species. Which of the following is an example for an electrophile.

a)

NH3

b)

H2O

c)

AlCl3

44.

____________ isomers occur when the types, number and bonds (connectivity) of the atoms are the same, but have a restricted rotation somewhere in a molecule. The common example is the double bond.

a)

Optical

b)

Chain

c)

Geometric

d)

Position

45.

Which of the following compounds exhibits stereoisomerism?

a)

Butanal

b)

Propanoic acid

c)

1-bromohexane

d)

3,4-dichloropent-1-ene

46.

Which of the following compound(s) exhibit(s) cis-trans isomerism?

(1) 1,2-dibromo-1,2-dichloroethene

(2) 3,3-dibromo-2-chloropropene

(3) 1,2-dichloropropene

a)

(1) only

b)

(2) only

c)

(1) and (3) only

d)

(2) and (3) only

47.

The most unstable conformer in cyclohexane?

a)

Boat

b)

Chair

c)

Twist boat

d)

half chair

48.

Chlorination of alkanes is an example of

a)

Elimination reaction

b)

Free radical substitution reaction

c)

Nucleophilic substitution reaction

d)

Electrophilic addition reaction

49.

Most stable conformation of cyclohexane is

a)

chair

b)

boat

c)

twist boat

d)

half chair

50.

Which of the following compound has gauche as it stable conformer?

a)

n-butane

b)

n-propane

c)

1,2-dicloroethane

d)

1,2-dihydroxyethane

51.

Can enantiomer rotates plane-polarised light?

a)

Yes in all situations

b)

No because it is optically active

c)

Yes but it can only rotate the polarised light in opposite direction

d)

No due to its restricted rotation of carbon-carbon double bond

52.

What is a hydrocarbon?

a)

A compound that contains Hydrogen and carbon

b)

A compound that contains Hydrogen and carbon only

c)

A fuel that contains hydrogen and carbon

d)

A misture of Carbon and water

53.

What does the following sentence describe:

A compound in which there are only single bonds between the atoms in the molecule

a)

Saturated compound

b)

Polar compound

c)

Flamable compound

d)

Aromatic compound

54.

Ethene is tested for unsaturation using:

a)

Bromine water

b)

Litmus

c)

Concentrated sulphuric acidSulphuric

d)

A lit splint

55.

Which of the following would increase the octane number of a fuel?

Select all that apply

a)

Having a longer chain in the molecule

b)

Having more branching (methyl groups)

c)

Turning straight chain molecules into cyclical molecules

d)

All of the above

e)

None of the above

56.

In which of the following do particles sit at the bottom

a)

Solution

b)

Suspension

c)

None of the above

d)

Colloid

57.

It shows a Tyndall effect when light is passed through

a)

Solution

b)

Suspension

c)

Colloid

d)

Both b and c

58.

Coffee beans, Powdered milk, Powdered coffee

a)

Sol, Sus, Col

b)

Sus, Sus, Col

c)

Sus, Col, Sol

d)

Col, Sus, Sol

59.
What is the universal solvent?
a)
salt
b)
sugar
c)
water
d)
ice
60.

A mixture with more solute dissolved in the solvent than is usually soluble is called:

a)

concentrated

b)

supersaturated

c)

saturated

d)

unsaturated

61.

When you have added as much solute as can dissolve in the solvent, the solution is called:

a)

concentrated

b)

supersaturated

c)

saturated

d)

unsaturated

62.
What is a solvent?
a)
The substance that does the dissolving in a solution.
b)
The substance that is being dissolved in a solution.
c)
The mixing of different substances.
d)
The process in which neutral molecules lose or gain electrons
63.
This is the part of a solution that dissolves
a)
Solute
b)
Solvent
c)
Solution
d)
Mixture 
64.
Kool-Aid - Powder, sugar, and water
Identify the solvent 
a)
water
b)
powder
c)
sugar
d)
powder and sugar
65.
salt water is a 
a)
compound
b)
element
c)
heterogeneous mixture
d)
solution
66.

Solubility refers to the ____ of solute that can dissolve in a certain volume or mass of solvent, at a certain temperature.

a)

Mean

b)

Range

c)

Amount

d)

Mode

67.
What does it mean to dilute a solution?
a)
lower the concentration of solute per solvent
b)
increase the concentration of solute per solvent
68.

What is the molarity of a 0.5L sample of a solution that contains 60.0 g of sodium hydroxide (NaOH)

a)

0.8 M

b)

1.5M

c)

3.0M

d)

6.0M

69.

Which of the following is the correct formula for calculating molarity?

a)

moles/liters of solution

b)

moles/kg of solvent

c)

# particles/Avogadro's #

d)

theoretical yield/actual yield

70.
How many moles of NaCl are present in a solution with a molarity of 8.59 M and a volume of 125 mL?
a)
1074 mol
b)
0.069 mol
c)
1.07 mol
d)
62.7 mol
71.
What is the molarity of 4 g of NaCl (MM=58.45) in 3,800 mL of solution?
a)
0.018 M
b)
0.0011 M
c)
1.052 M
d)
0.062 M
72.
How many grams of solute are dissolved in 125.0 mL of 5.00 M NaCl (MM = 58.45)?
a)
0.625 g NaCl
b)
625 g NaCl
c)
36.5 g NaCl
d)
0.04 mol NaCl
73.

Which of the following is the Dilution Formula?

a)

V1M1 = V2M2

b)

M = m/V

c)

V = mT

d)

PV = nRT

74.

A dilution is when

a)

solute is added to the volume of solution

b)

water is added to the volume of solution

c)

solute is removed from the volume of solution

d)

water is removed from the volume of solution

75.

What volume, in milliliters, of 10.0 M NaOH is needed to prepare 300.0 mL of 2.00 M NaOH by dilution?

a)

0.067 mL

b)

60.0 mL

c)

100 mL

d)

125 mL

76.
How many mL of 10.8M HCl are required to make 100.0 mL of 3.00M acid?
a)
27.8 mL
b)
27.78 mL
c)
2.8 mL
d)
278 mL
77.

(9.2) Sort in order of ascending boiling point

a)

Alkyne<Alkene<Alkane

b)

Alkane<Alkyne<Alkene

c)

Alkane<Alkene<Alkyne

d)

Alkene<Alkane<Alkyne

78.

(9.1/2) Both alkanes and alkenes can be involved in what sort of reaction?

a)

Oxidation

b)

Addition

c)

Substitution

d)

Combustion

79.
If a spoonful of sugar is mixed in a glass of water, what is the water called? 
a)
solute
b)
solution
c)
solvent
d)
element 
80.

Which element is organic chemsitry about?

a)

Boron

b)

Sodium

c)

Carbon

d)

Sulphur

81.

Carbon’s atomic number is 6. It means that Carbon has

a)

6 protons

b)

6 neutrons

c)

6 neutrinos

d)

6 bosons

82.

Carbon has 4 valence electrons. What is the valence configuration?

a)

1s2 p2

b)

2s2 p2

c)

3s2 p2

d)

4s2 p2

83.

Carbon has three forms (allothrops). Which one is NOT one?

a)

Diamond

b)

Coal

c)

Granite

d)

Graphite

84.
Is NaCl (table salt) a Organic or Inorganic Compound?
a)
Inorganic
b)
Organic
85.

What is a functional group?

a)

Group of atoms that give specific characteristics to a molecule

b)

Group of molecules that give specific characteristics to an atom

c)

Group of molecules that make up a group of atoms

d)

Group of atoms that give specific characteristics to an element

86.

Which one is not a colloid

a)

Foam

b)

Gel

c)

Emulsion

d)

Coffee

87.

A __________________ is a substance that has definite physical and chemical properties such as appearance, melting point, and reactivity.

a)

mixture

b)

pure substance

c)

compound

d)

element

88.

Particles of a homogeneous mixture is smaller than ______.

a)

1nm

b)

0.5nm

c)

2nm

d)

1.5nm

89.

Why is milk a hetrogeneous mixture?

a)

It's particles settle down after a while

b)

It scatters light

c)

It's particles are very small

90.

How do we seperate particles from colloidal solutions?

a)

Distilation

b)

Sedimantation

c)

Evaporation

d)

Centrifugation

91.

Identify what mixtures can be made from.

a)

Gases only

b)

Solid, liquids and gases

c)

Liquids and gases, but not solids

d)

Liquids only

92.

Select the statement that best describes a mixture of eggs and air while being whisked.

a)

The longer eggs are whisked, the more solid they become. This is because more air is being added to the mixture.

b)

The amount of time spent whisking eggs makes no difference to the mixture. Its properties don’t change.

c)

The longer eggs are whisked, the fluffier they become. This is because more air is being added to the mixture.

93.

Which is a colloid?

a)

Air

b)

Rice in water

c)

Fog

d)

Rain water

94.

Which of the following describe PURE SUBSTANCES?

a)

It is heterogenous

b)

It has defined and unique properties

c)

Its composition varies from sample to sample

d)

There are two classification of Pure substances: Homogenous and Heterogenous

95.

Homogenous mixtures forms _________ and has a uniform appearance.

a)

four phases

b)

three phases

c)

two or more phases

d)

one phase

96.

__________ refers to separating components with varying sizes by scooping or picking. Example if you want to separate cereals from milk.

a)

Using Magnets

b)

Physical Manipulation

c)

Sedimentation and Decantation

d)

Filtration

97.

___________ is a separation technique that makes use of the difference in boiling points between two liquids.

a)

Distillation

b)

Filtration

c)

Evaporation

d)

Physical Manipulation

98.

If you want to separate metals from non metals, which technique will be most effective?

a)

Physical Manipulation

b)

Use of Magnets

c)

Filtration

d)

Evaporation

99.

●

Which of the following refers to the scattering of light caused by the random motion of the particles?

a)

Tyndall Effect

b)

Brownian Motion

c)

Reflection of Light

d)

Refraction of Light

100.

Calculate the mass of sodium sulphate required to prepare its 20% (mass percent) solution in 100 g of water.

a)

25 g

b)

22 g

c)

15 g

d)

20 g

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