1. Which of the following solutions is the weakest base: a. a solution with a pH
ID: 3508733 • Letter: 1
Question
1. Which of the following solutions is the weakest base:
a. a solution with a pH of 2.4
b. a solution with a pH of 5.2
c. a solution with a pH of 6.4
d. a solution with a pH of 8.6
e. a solution with a pH of 10.1
2. In the chemical reaction, HCl + NaOH ---> H2O +NaCl, the chemial HCl is considered to be:
a. water
b. base
c. product
d. acid
e. salt
3. Isotopes have different numbers of _____; thus they also have different _____.
a. protons; atomic numbers
b. neutrons; atomic masses
c. electrons; atomic numbers
d. protons; atomic masses
e. neutrons; atomic numbers
4. One major function of Ca+2 is to
a. serve as a salt in bones and teeth
b. it maintains the resting membrane potential
c. make functional thyroid hormones
d. influence the pH of body fluids
e. exist as the most abundant extracellular cation
5. What is the type of intra-molecular bond force that exists in between a nonmetallic Hydrogen atom and a nonmetallic Oxygen atom?
a. Polar Covalent Bond
b. Non-polar Covalent Bond
c. Ionic Bond
d. Hydrophilic Bond
e. Hydrophobic Bond
Explanation / Answer
1) Every strongest acid has the it's weakest conjugate base and strongest acid is one who has less pH. Hence 2.4 is containing solution is stronger acid. So it has weakest base.
Hence option (a) is correct.
2) Acid is proton doner and base is proton acceptor as Arrhenius theroy.
Hence in the reaction
HCl + Nacl--->H2O +NaoH
HCl donate proton to form water (H2O).
Hence it's acid.
Option (d) is correct.
3) Isotopes are the one which have same number of protons and atomic weight but different number of neutrons and atomic mass in their nucleus.
Hence option (a) is correct.
4) Calcium ion has the major function in cell resting membrane potential.
Hence option (b) is correct.
5) Intramolecular bond force is the force within the same atom.
Nonmetallic hydrogen atom and nonmetallic oxygen atom have covalent non-polar covalent bond.
Covalent bond is the bond formed sharing of electrons between two atoms.
Non metals have high electronegativity. Except hydrogen all non metals have more than 2 elctrons sharing shells.
Hence option (b) is correct.
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