Tag: chemical reactions

Questions Related to chemical reactions

Which of the following is an electrolyte?

chemistry electrolysis electrolytes and non-electrolytes introduction to electrolysis chemical reactions

  1. $AgNO _3$ solution

  2. Alcohol

  3. Mercury

  4. Sugar solution

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Correct Option: A
Explanation:

Electrolyte is a substance that dissociates into ions in a solution and acquires the capacity to conduct electricity. Electrolysis is the dissociation of an electrolyte into ions at the electrodes by the passage of electric current.
During the electrolysis of silver nitrate solution, silver gets deposited at the cathode, while the anode loses an equal amount of Ag. Hence, $Ag{ NO } _{ 3 }$ is an electrolyte.

Which of the following is not a non electrolyte?

chemistry electrolysis electrolytes and non-electrolytes introduction to electrolysis chemical reactions

  1. Acetic acid

  2. Glucose

  3. Ethanol

  4. Urea

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Correct Option: A
Explanation:
Acetic acid is a weak electrolyte because its dissociation constant is small meaning there will be few ions in solution to conduct electricity

Define good conductors of electricity.

chemistry electrolysis electrolytes and non-electrolytes introduction to electrolysis chemical reactions

  1. Compounds which do not break up from their solution on passing electric current

  2. Materials which do not allow electric current to pass through them easily

  3. Substances which allow electric current to pass through them easily

  4. Compounds which break up from their solution on passing electric current

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Correct Option: C
Explanation:

Substances which allow electric current to pass through them easily are called good conductors of electricity.

Saturated solution of $KNO _3$ with agar-agar is used to make salt bridge because :

chemistry electrolysis electrolytes and non-electrolytes introduction to electrolysis chemical reactions

  1. size of $K^+$ is greater than that of $NO _3^-$

  2. velocity of $NO _3^-$ is greater than that of $K^+$

  3. Velocities of both $K^+$ and $NO _3^-$ are nearly the same

  4. both velocity and sizes of $K^+$ and $NO _3^-$ ions are same

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Correct Option: C
Explanation:

Because velocity of $k^+$ & $NO _{3}^{-}$ ions same & it so not happens one start getting accumulate which have higher velocity and block the test tube.

Weak electrolyte is:

chemistry chemical reactions electrolytes and non-electrolytes introduction to electrolysis electrolysis

  1. $(NH _4) _2C _2O _4$

  2. $(NH _4) _2SO _4$

  3. A and B both

  4. None

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Correct Option: A

At $90^oC$, $pH$ of an aq. solution of a strong electrolyte is 7. What is the nature of electrolyte? 

chemistry electrolysis electrolytes and non-electrolytes introduction to electrolysis chemical reactions

  1. Neutral

  2. Basic

  3. Acidic

  4. Cannot say

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Correct Option: A
Explanation:

A strong electrolyte dissociates completely.

$pH=7$ given.
So, the electrolyte is neutral.

Maximum number of moles of oxygen gas that can be obtained by the electrolytic decomposition of 90 g of water will be 

chemistry electrolysis electrolytes and non-electrolytes introduction to electrolysis chemical reactions

  1. 1

  2. 2.5

  3. 5

  4. 9

Show answer
Correct Option: B
Explanation:

Electrolytic decomposition of 18 g of water gives 0.5 mole of O2.
So 90 g of water will give (0.5/18)×90 = 2.5 moles of O2.

The max. no of moles of oxygen gas is 2.5 moles

Which compounds dissociate to ions, when they dissolved in water?

chemistry electrolysis electrolytes and non-electrolytes introduction to electrolysis chemical reactions

  1. $BaSO _4; C _2H _4, AgCl$

  2. $KOH; C _6H _6; H _2SO _4$

  3. $Ca _3(PO _4) _2AgI; Cu(NO _3) _2$

  4. $AlCl _3; KOH; O _2$

  5. $KOH; H _2SO _4; KMnO _4$

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Correct Option: E

The aqueous solution of non-electrolytes contains :

chemistry electrolysis electrolytes and non-electrolytes introduction to electrolysis chemical reactions

  1. atoms

  2. ions

  3. electrons

  4. molecules

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Correct Option: D
Explanation:

Non- electrolytes do not dissociate completely into ions in aqueous solution. So, only their molecules are present in the solution.

Which of the following is not a strong electrolytes ?

chemistry electrolysis electrolytes and non-electrolytes introduction to electrolysis chemical reactions

  1. $NaCl$

  2. $KNO _3$

  3. $NH _4OH$

  4. $FeSO _4$

Show answer
Correct Option: C
Explanation:
Here ${ NH } _{ 4 }OH$ is not a strong electrolyte because it doesn't dissociates completely.
$\rightarrow$  $\therefore$   ${ NH } _{ 4 }OH$ is a weak electrolyte.
Ans :- Option $C$.