Chemistry

Electrochemistry and Solutions

206 Questions

Work through advanced chemistry questions focusing on electrochemistry and properties of solutions. Key themes include electrolytic conductivity, colloidal solutions, and solubility products. These concepts are frequently tested in JEE advanced, NEET, and university level chemistry competitive examinations.

Colloidal solutionsMolar conductivitySolubility productElectrolytic conductivityHydrolysis of saltsEquivalent conductivity

Electrochemistry and Solutions Questions

Multiple choice chemistry coordination chemistry werner's theory werner's theory of coordination compounds coordination compounds

1 mole of co-ordinate compound $CoCl _3$ on reaction with excess AgNCl $143.5$gms of AgCl ppt . Then number of chloride ions satisfying both primary valency and secondary valency are?

  1. $2$
  2. $3$
  3. $1$
  4. $0$
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

Moles of $AgCl$ formed $=\cfrac{143.5}{143.5}=1$

$1$ mole of $CoCl _3$ gives $1$ mol of $AgCl$ ppt.
Secondary valence is the number of ions that are coordinated to metal ion. Here, $1Cl^-$ ion is not coordinated to the metal ion, due to which it gives $AgCl$ ppt. Hence, no. of chloride ions satisfying the given condition $=2.$

Multiple choice chemistry coordination chemistry werner's theory werner's theory of coordination compounds coordination compounds

The units of solubility product of silver chromate $(Ag 2CrO _4)$ will be _________.

  1. $mol^2L^{-2}$
  2. $mol^3L^{-3}$
  3. $mol L^{-1}$
  4. $mol L^{-2}$
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation
 Molar solubility is the number of moles of a substance (the solute) that can be dissolved per liter of solution before the solution becomes saturated. It can be calculated from a substance's solubility product constant (Ksp) and stoichiometry. The units are mol/L, sometimes written as M.

Multiple choice chemistry coordination chemistry werner's theory werner's theory of coordination compounds coordination compounds

which has the maximum conductivity in thier 0.1M solution?

  1. A) $\left[ Co{ (NH } _{ 3 }) _{ 3 }{ Cl } _{ 3 } \right] $
  2. B) $\left[ Co({ NH } _{ 3 }) _{ 4 }Cl \right] { Cl } _{ 2 }$
  3. C) $\left[ Co({ NH } _{ 3 }) _{ 5 }Cl \right] { Cl } _{ 2 }$
  4. D) $\left[ Co({ NH } _{ 3 }) _{ 6 } \right] { Cl } _{ 3 }$
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

The maximum conductivity is shown by that compound which have maximum ions on dissociation. Hence the compound $[Co(NH _3) _6]Cl _3$ have the maximum number of ions $[Co(NH _3) _6] + 3Cl^-$ = 4 ions and hence the correct answer is D.

Multiple choice chemistry chemical reactions effects of oxidation reactions in daily life corrosion of metals electroplating and its application

Give a balanced equation for thermal dissociation of a solid [both containing the chloride ion].

  1. $2{ NH } _{ 4 }Cl\left( s \right) \rightleftharpoons { N _2H _6}\left( g \right) +2HCl\left( g \right) $
  2. ${ NH } _{ 4 }Cl\left( s \right) \rightleftharpoons { NH } _{ 3 }\left( g \right) +Cl _2\left( g \right) $
  3. ${ NH } _{ 4 }Cl\left( s \right) \rightleftharpoons { NH } _{ 3 }\left( g \right) +H _2\left( g \right) $
  4. ${ NH } _{ 4 }Cl\left( s \right) \rightleftharpoons { NH } _{ 3 }\left( g \right) +HCl\left( g \right) $
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

On heating ammonium chloride above 340$^0$C it decomposes into mixture of ammonia and hydrochloric gas. It is a reversible reaction.
${ NH } _{ 4 }Cl\left( s \right) \rightleftharpoons { NH } _{ 3 }\left( g \right) +HCl\left( g \right) $

Multiple choice

What is the maximum contaminant level (MCL) for lead in drinking water, as set by the EPA?

  1. 0.015 mg/L

  2. 0.05 mg/L

  3. 0.15 mg/L

  4. 0.25 mg/L
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The maximum contaminant level (MCL) for lead in drinking water, as set by the EPA, is 0.015 mg/L.

Multiple choice

What is the mass of the products formed when 20 g of sodium (Na) reacts completely with 35.5 g of chlorine (Cl2)?

  1. 20 g

  2. 35.5 g

  3. 55.5 g

  4. 71 g
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

According to the law of conservation of mass, the total mass of the reactants (20 g Na + 35.5 g Cl2) is equal to the total mass of the products. Therefore, the mass of the products is 55.5 g.

Multiple choice

What is the maximum allowable concentration (MAC) of respirable dust in a mining environment?

  1. 10 milligrams per cubic meter (mg/m^3)

  2. 5 milligrams per cubic meter (mg/m^3)

  3. 2 milligrams per cubic meter (mg/m^3)

  4. 1 milligram per cubic meter (mg/m^3)
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

The maximum allowable concentration (MAC) of respirable dust in a mining environment is 2 milligrams per cubic meter (mg/m^3), as per MSHA regulations.

Multiple choice

What is the maximum contaminant level (MCL) for lead in drinking water?

  1. 0.015 mg/L

  2. 0.05 mg/L

  3. 0.1 mg/L

  4. 0.2 mg/L
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The maximum contaminant level (MCL) for lead in drinking water is 0.015 mg/L.

Multiple choice

What is the maximum contaminant level (MCL) for lead in drinking water?

  1. 15 ppb

  2. 10 ppb

  3. 5 ppb

  4. 0 ppb
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The maximum contaminant level (MCL) for lead in drinking water is 15 ppb (parts per billion). This means that public water systems cannot exceed this level in their treated water.

Multiple choice

What is the maximum allowable concentration of mercury in fish, according to the Minamata Convention?

  1. 0.1 ppm

  2. 0.5 ppm

  3. 1.0 ppm

  4. 2.0 ppm
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The Minamata Convention sets a maximum allowable concentration of 0.1 ppm (parts per million) for mercury in fish to protect human health.