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Chemistry Questions 3. What is true of a strong acid? A. It ionizes close to 100% in water B. It is a weak electrolyte C. It does not conduct electricity in solution D. It always has a high concentration 4. What substance is acting as the Bronsted-Lowry base in the forward reaction below? H2O + HCl --> H3O+ + Cl- A. H3O+ B. Cl- C. H2O D. HCl 5. Which of the following is NOT an acid-base neutralization reaction? A. NH3 + HCl --> NH4Cl B. NaOH + CH3COOH --> Na CH3COO + H2O C. 2 HNO3 + Ca(OH)2 --> Ca(NO3)2 + 2 H2O D. H2SO4 + 2 NaCl --> 2 HCl + Na2SO4



Answer :


Strong acid does not conduct electricity. Question 4} A. H30  Question 5 } B. NaOH + CH3COOH

Answer:

For 3: The correct answer is Option A.

For 4: The correct answer is Option C.

For 5: The correct answer is Option D.

Explanation:

  • For 3:

There are 2 types of solutions on the basis of pH.

An acid is defined as the chemical substance which looses hydrogen ions in a solution.

A weak acid does not completely dissociates into its ions but a strong acid completely dissociates into its ions when dissolved in water.

A base is defined as the chemical substance which looses hydroxide ions in a solution.

A weak base does not completely dissociates into its ions but a strong base completely dissociates into its ions when dissolved in water.

Hence, the correct answer is Option A.

  • For 4:

According to the Bronsted Lowry conjugate acid-base theory, an acid is defined as a substance which donates protons and a base is defined as a substance which accepts protons.

For the given chemical equation:

[tex]H_2O+HCl\rightarrow H_3O^++Cl^-[/tex]

[tex]H_2O[/tex] is considered as a bronsted-lowry base because it is accepting hydrogen ion to form hydronium ion

HCl is considered as a bronsted-lowry acid because it is donating hydrogen ion to form chloride ion.

Hence, the correct answer is Option C.

  • For 5:

Neutralization reaction is defined as the chemical reaction in which an acid reacts with a base to produce a salt and water molecule.

[tex]HX+BOH\rightarrow BX+H_2O[/tex]

For the given options:

Option A:

The chemical equation follows:

[tex]NH_3+HCl\rightarrow NH_4Cl[/tex]

This is an example of neutralization reaction because ammonia is considered as a base and when it reacts with HCl, it leads to the production of salt.

Option B:

The chemical equation follows:

[tex]NaOH+CH_3COOH\rightarrow CH_3COONa+H_2O[/tex]

This is an example of neutralization reaction.

Option C:

The chemical equation follows:

[tex]2HNO_3+Ca(OH)_2\rightarrow Ca(NO_3)_2+2H_2O[/tex]

This is an example of neutralization reaction.

Option D:

The chemical equation follows:

[tex]H_2SO_4+2NaCl\rightarrow 2HCl+Na_2SO_4[/tex]

This is an example of double displacement reaction.

Hence, the correct answer is Option D.

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