PBOARDS 2023 MOD 1

Question 1

Most abundant state in the universe
A. Gas
B. Liquid
C. Plasma
D. Solid

Answer 1

C. Plasma

Question 2

Reducing agent
A. Gains electrons
B. Is oxidized
C. Is reduced
D. Decreases in oxidation number

Answer 2

B. Is oxidized

Question 3

Fluorspar is
A. Calcium fluoride
b.Sodium fluoride
C Magnesium fluoride
D. Cerium fluoride

Answer 3

A. Calcium fluoride

Question 4

The Cahn-Ingold-Prelog system is used for what purpose?
A. Identify reactive sites in an organic compound
b. Determine R or S designation of enantiomers
C. Determine stability of alpha carbons
d. Identify conformational isomers
e. Determine cis-trans isomerism

Answer 4

b. Determine R or S designation of enantiomers

Question 5

It has a high refractive index that contributes to its opacity
a. Zirconium oxide: carcinogenic (granuloma formation)
B. Zinc oxide: artringent/antireptic (calamine Lotion)
c. Titanium dioxide rolar ray protectant; opacifying agent
d.None of the above

Answer 5

c. Titanium dioxide

Question 6

Fe4[Fe(CN)6]3 is
A. Turnbull’s blue : fe, [Fe(CN)6]2
b. Prussian blue: opposite ni Turnbull’s
C. Ferrocyanide
d.All of the above

Answer 6

b. Prussian blue

Question 7

Rose metal is : Taar / Bismuth
a. 25% Sn. 25% Pb. 50% Bi
b. 50% Sn. 50% Pb : solder (so/so buhay ni solder)
C. 25% Bi, 25% Pb. 50% Sn “soldier”
d None of these

Answer 7

a. 25% Sn. 25% Pb. 50% Bi

Question 8

This is obtained from the removal of most of the impurities in a cast iron
a. Wrought iron
b. Reduced iron
C. a and b
d. None of this

Answer 8

a. Wrought iron

Question 9

Which of the following antineoplastics is not considered an antimetabolite?

a. Methotrexate: antifdate antimetabolite
B. Etoposide: topoisomerase inhibitor
C. Thioguanine: purine analog Fantin
D. Fluorouracil pyrimidine analog
e.None of the above

Answer 9

B. Etoposide

Question 10

Continued use of hydrogen peroxide as mouthwash may cause

a Green tongue
b Black tongue
C Hairy tongue: Hypertrophy
d. Scaly tongue

Answer 10

C Hairy tongue

Question 11

This process can produce hydrogen with 99% purity and is based on the decomposition of superheated steam by metallic iron with the subsequent reduction of iron oxides so formed by a mixture of carbon monoxide and hydrogen * see iPad for other processes
Messerschmidt process

Cerium fluoride

Solvay process: sodium carbonate
C.
Haber process: Ammonia
d. None of these

Question 12

This process can produce hydrogen with 99% purity and is based on the decomposition of superheated steam by metallic iron with the subsequent reduction of iron oxides so formed by a mixture of carbon monoxide and hydrogen * see iPad for other processes
Messerschmidt process

Cerium fluoride

Solvay process: sodium carbonate
C.
Haber process: Ammonia
d. None of these