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Quiz 7 Flashcards

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1
Q
  1. Of the following elements the one that always has the oxidation number –1 in its compound is

hydrogen

sodium

fluorine

oxygen

A

fluorine

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2
Q
  1. If an element is in its lowest oxidation state, under appropriate circumstances, it can act as

a reducing agent

an oxidizing agent

either an oxidizing agent or a reducing agent depending upon whether its oxidizing number is negative or positive

neither an oxidizing agent nor a reducing agent

A

an oxidizing agent

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3
Q
  1. The atom with high electronegativity value

a small tendency to attract electrons

no tendency to attract electrons

a large tendency to attract electrons

the attraction for electrons does not depend upon electronegativity but upon electron affinity

A

a large tendency to attract electrons

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4
Q
  1. Which pair of elements is most likely to combine to form compounds by sharing electrons?

Li and F

B and C

Cs and I

Mg and O

A

B and C

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5
Q
  1. An isotope of hydrogen is

neptunium

plutonium

thorium

tritium

A

tritium

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6
Q
  1. Which element has the greatest tendency to lose electrons?

F

S

Fr

Be

A

Fr

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7
Q
  1. An electron emitted from the nucleus of a radioactive element is called

positron

antiproton

β-particle

alpha particle

A

β-particle

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8
Q
  1. Transmutation of element was first of all achieved in the laboratory by

Rutherford

Hertz

Fermi

Strassman and Hahn

A

Strassman and Hahn

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9
Q
  1. In a chemical reaction equilibrium is said to have been established when the

Concentrations of reactants and products are equal

Opposing reaction cease

Velocities of opposing reactions become equal

Temperatures of opposing reactions are equal

A

Velocities of opposing reactions become equal

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10
Q
  1. A pressure cooker reduces cooking time because _______.

The heat is more evenly distributed

The higher pressure tenderizes the food

The boiling point is elevated

A large flame must be used

A

The boiling point is elevated

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11
Q
  1. The movement of gas molecules through a pinhole.

diffusion

effusion

transmission

desorption

A

effusion

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12
Q
  1. It is the point in a phase diagram at which the last drop of liquid disappears.

dew point

bubble point

saturation point

tie line

A

dew point

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13
Q
  1. Crystallization occurs in a solution that is

concentrated

unsaturated

supersaturated

saturated

A

supersaturated

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14
Q
  1. Milk is a example of

Gel

Sol

Foam

Emulsion

A

Emulsion

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15
Q
  1. An aerosol is a colloidal system consisting of

A gas dispersed in solid

A liquid dispersed in solid

A liquid dispersed in a gas

A solid dispersed in a gas

A

A solid dispersed in a gas

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16
Q
  1. Which one of the following is a colloid?

Blood

Cane sugar

Urea

NaCl

A

Blood

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17
Q
  1. Colloids and crystalloids differs in

Solubility

Particle size

Radius

Diameter

A

Particle size

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18
Q
  1. Buffer solutions have

Reserve acidity only

Reserve alkalinity

pH equal to 7

Reserve acidity as well as reserve alkalinity

A

Reserve acidity as well as reserve alkalinity

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19
Q
  1. The bond formed between hydrogen and halogen is of

covalent nature

electrovalent nature

polar nature

Co – ordinate nature

A

Covalent nature

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20
Q
  1. Aqua regia is prepared by adding conc. HNO3 to

conc. H2SO4

conc. H3PO4

conc. HCl

conc. HBr

A

conc. HCl

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21
Q
  1. Which is the strongest acid amongst the following?

HClO

HClO2

HClO3

HClO4

22
Q
  1. What do you call the volume occupied by a unit mass of fluid?

specific volume

density

specific gravity

specific weight

Study These Flashcards
A

specific volume

23
Q
  1. A leak from a faucet comes out in separate drops. Which of the following is the main cause of this phenomenon?

gravity

air resistance

viscosity of the fluid

surface tension

Study These Flashcards
A

surface tension

24
Q
  1. Hydrometer is used to find out

specific gravity of liquids

specific gravity of solids

specific gravity of gases

relative humidity

Study These Flashcards
A

specific gravity of liquids

25
25. Who determined that energy is radiated only when an electron falls from a higher energy level to a lower energy level? Einstein Rutherford Heisenberg Bohr
Bohr
26
26. Who determined the charge of an electron by means of the oil droplet experiment? Rutherford Heisenberg Millikan de Broglie
Millikan
27
27. Who showed that electrons can be considered to have both particle character and wave character? Thompson Moseley Heisenberg de Broglie
de Broglie
28
28. Who determined that no two electrons may have the same set of four quantum numbers? Planck Pauli Hund Rutherford
Pauli
29
29. The quantity of heat needed to raise the temperature of a substance 1°C is its heat capacity specific heat enthalpy calorimetry
heat capacity
30
30. The properties of a real gas are most likely to deviate from those properties predicted for an ideal gas when the pressure is low the temperature is high the pressure is high and the temperature is low the pressure is low and the temperature is high
the pressure is high and the temperature is low
31
31. From the thermal decomposition of a pure solid, we obtained a solid and a gas, each of which is a pure substance. From this information, we can conclude with certainty that the original solid is not an element at least one of the products is an element both products are elements the solid is a compound and the gas is an element
the original solid is not an element
32
32. The critical point for a mixture occurs for which of the following cases? the vapor and liquid have a single form the liquid has no absorbed gas the vapor phase is stable the liquid is completely vaporized
the vapor and liquid have a single form
33
33. Which of the following elements and compounds is unstable in its pure form? sodium helium carbon dioxide neon
sodium
34
34. A substance is oxidized when which of the following occurs? it turns red it becomes more negative it loses electrons it gives off heat
it loses electrons
35
35. Which of the following affects most of the electrical and thermal properties of materials? the atomic weight expressed in grams per gram-atom the electrons, particularly the outermost ones the magnitude of the electrical charge of the protons the weight of the atoms
the electrons, particularly the outermost ones
36
36. In molecules of the same composition, what are variations of atomic arrangements known as? polymers monomers crystal systems isomers
isomers
37
37. What device is used to measure the amount of infrared radiation in each portion of a persons skin that is emitted? thermograph thermometer pyrometer potentiometer
thermograph
38
38. If the freezing point of water is 0°C, which of the following is its melting point? slightly less than 0°C slightly more than 0°C 0°C 32°C
0°C
39
39. The amount of heat required to change the substance from solid to liquid state without change in temperature is known as the latent heat of _____. evaporation vaporization condensation fusion
fusion
40
40. Why are metals good conductors of heat? because they contain free electrons because their atoms are relatively far apart because their atoms collide frequently because they have reflecting surfaces
because they contain free electrons
41
41. What usually happen when a vapor condenses into a liquid? it evolves heat it generates heat its temperature increases it boils with temperature less than 100°C
it evolves heat
42
42. Which of the following is the science of low temperatures? thermokinetics thermodynamics ergonomics cryogenics
cryogenics
43
43. Calcite is potassium carbonate calcium carbonate sodium hydroxide calcium hydroxide
calcium carbonate
44
44. The number of molecules in 22.4 liters (under standard conditions) of a substance in its gaseous state, is called Dulong’s number Petit’s number Avogadro’s number Gay-Lussac’s number
Avogadro’s number
45
45. Ozone, O3, filters out a large amount of the ultraviolet and other dangerous radiations from the sun. It is found in the: troposphere thermosphere stratosphere lithosphere
stratosphere
46
46. One ingredient present in all baking powder is sodium citrate sodium betabisulfate sodium bicarbonate potassium tartrate
sodium bicarbonate
47
47. What is defined as the quantity of heat needed to raise the temperature of one kilogram of water by one degree Celsius? kilojoule BTU kilocalorie latent heat
kilocalorie
48
48. Who coined the word energy? James Joule Tomas Young Rodulf Diesel Lord Kelvin
Tomas Young
49
49. Isotopes have different period number group number number of nucleons atomic number
number of nucleons
50

WAZZAP (31 decks)

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