General Chemistry

Question 1

He discovered the nucleus with his “Gold Foil” experiment.

A. Eugen Goldstein
B. J.J. Thomson
C. Ernest Rutherford
D. John Dalton

Answer 1

C. Ernest Rutherford

Question 2

He is credited with the discovery of electron in an atom.

A. Eugen Goldstein
B. J.J. Thomson
C. Ernest Rutherford
D. John Dalton

Answer 2

B. J.J. Thomson

Question 3

Which of the following is an intensive property?

A. mass
B. density
C. volume
D. none of these

Answer 3

B. density

Question 4

Which of the following is an extensive property?

A. weight
B. density
C. melting point
D. none of these

Answer 4

A. weight

Question 5

Brass is an example of ___________.

A. Element
B. Compound
C. Homogenous mixture
D. Heterogenous mixture

Answer 5

C. Homogenous mixture

Question 6

Methane is an example of __________.

A. Element
B. Compound
C. Homogenous mixture
D. Heterogenous mixture

Answer 6

B. Compound

Question 7

Which of the following is not an example of observable physical property?

A. color
B. mass
C. texture
D. odor

Answer 7

B. mass

Question 8

It is the number of proton in nucleus.

A. Valence
B. Atomic charge
C. Atomic mass
D. Atomic number

Answer 8

D. Atomic number

Question 9

Atoms of the same element with varying number of neutrons

A. Isotopes
B. Ions
C. Element
D. None of these

Answer 9

A. Isotopes

Question 10

He arranged the elements in the periodic table in groups of 3’s or triads also known as “Law of Triad”.

A. Johann Wolfgang Dobereiner
B. John Newlands
C. Dmitri Mendeleev
D. Julius Meyer

Answer 10

A. Johann Wolfgang Dobereiner

Question 11

He arranged the elements in the periodic table in groups of 8’s like from lithium to sodium also known as “Law of Octaves”.

A. Johann Wolfgang Dobereiner
B. John Newlands
C. Dmitri Mendeleev
D. Julius Meyer

Answer 11

B. John Newlands

Question 12

He formulated the Periodic Law.

A. Johann Wolfgang Dobereiner
B. John Newlands
C. Dmitri Mendeleev
D. Julius Meyer

Answer 12

C. Dmitri Mendeleev

Question 13

A substance that has the ability to dissolve or disperse one or more substances?

A. solute
B. crystal
C. solvent
D. none of these

Answer 13

C. solvent

Question 14

A solution with solute that dissolves until it is unable to dissolve anymore, leaving the undissolved substances at the bottom.

A. unsaturated solution
B. saturated solution
C. supersaturated solution
D. none of these

Answer 14

B. saturated solution

Question 15

A solution that completely dissolves, leaving no remaining substances.

A. unsaturated solution
B. saturated solution
C. supersaturated solution
D. none of these

Answer 15

A. unsaturated solution

Question 16

A solution that contains more undissolved solute than the saturated solution because of its tendency to crystallize and precipitate.

A. unsaturated solution
B. saturated solution
C. supersaturated solution
D. none of these

Answer 16

C. supersaturated solution

Question 17

Which of the following is arranged in increasing atomic size?

A. Mg > Ca > K > Fr
B. Mg > Sc > Sr > Ca
C. Ca > Mg > K > Sr
D. Ca > K> Mg > Fr

Answer 17

A. Mg > Ca > K > Fr

Question 18

Which of the following elements is more electronegative: Cl, S, or Mg?

A. Cl
B. S
C. Mg
D. None of these

Answer 18

A. Cl

Question 19

Which of the following elements is more reactive: Li, Rb, or Fr?

A. Li
B. Rb
C. Fr
D. None of these

Answer 19

C. Fr

Question 20

The seven horizontal rows in the periodic table are called __________.

A. groups
B. periods
C. families
D. valence

Answer 20

B. periods

Question 21

Group 7A is a family of _______

A. Alkali Metals
B. Halogens
C. Noble gases
D. Alkaline Metals

Answer 21

B. Halogens

Question 22

Which of the following elements (Br or Cu) has the higher ionization energy?

A. Cu
B. Br
C. Both elements
D. None of these

Answer 22

B. Br

Question 23

Which has a larger ionic size ( Na+ or Mg2+)

A. Na +
B. Mg 2+
C. Both ions
D. None of these

Answer 23

A. Na +

Question 24

Calculate the % Ca in Ca(OH)2.

A. 43.18%
B. 2.73%
C. 54.09%
D. 26.7%

Answer 24

C. 54.09%

Question 25

What is the empirical formula of a compound which contains 2.05% H, 32.65% S, and 65.30% O? A. HSO4 B. H2SO C. H2SO4 D. none of the above

Answer 25

C. H2SO4

Question 26

What is the empirical formula of a compound which contains 52.94% Al and 47.06% O? A. Al2O3 B. AlO2 C. Al3O2 D. Al3O

Answer 26

A. Al2O3

Question 27

A compound is 85.69% C and 14.31% H. If the molar mass is 56g/mol, what is the molecular formula of the compound? A. CH2 B. CH4H10 C. CH4 D. C4H8

Answer 27

D. C4H8

Question 28

Agua regia is a/an ______. A. solution B. colloid C. suspension D. all of these

Answer 28

A. solution

Question 29

Sodium carbonate is also known as? A. caustic potash B. soda ash C. caustic soda D. baking soda

Answer 29

B. soda ash

Question 30

It is the most ideal gas element. A. Helium B. Oxygen C. Sulfur D. Neon

Answer 30

A. Helium

Question 31

What is the molecular formula if the empirical formula of a compound is CH. The molar mass of this compound is 78 g. A. C2H2 B. C6H6 C. C8H8 D. None of these

Answer 31

B. C6H6

Question 32

What is the molarity of a solution formed from 6.75 g of NaCl (58.4 g/mol) dissolved in water to make a solution with a total volume of 452 mL? A. 0.872 M B. 0.256 M C. 0.412 M D. 0.799 M

Answer 32

B. 0.256 M

Question 33

Calculate the molality of a solution prepared from 29.1 g of toluene (92 g/mol) dissolved in 832 g of benzene. A. 0.114 m B. 0.380 m C. 0.567 m D. 0.787 m

Answer 33

B. 0.380 m

Question 34

If a mixture of gases contains 7.50 g of H2, 3.25 g of O2 and 5.55 g of N2, what is the mole fraction of the oxygen gas? A. 0.925 B. 0.0253 C. 0.049 D. 0.673

Answer 34

B. 0.0253

Question 35

A solution is prepared by dissolving 464 g of NaOH (40 g/mol) in water and then diluting to 1 L. The density of the resulting density is 1.37 g/mL. What is the % mass of NaOH? A. 12.80% B. 11.60% C. 50.33% D. 33.87%

Answer 35

D. 33.87%