[1 Mark Question Answer]

Question 11 Mark

Select the ion, that would get selectively discharge from the aqueous mixture of the ions listed below :
$Pb^{2+}, Ag^+, Cu^+$

Answer

$Ag^+$

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Question 21 Mark

Select the ion, that would get selectively discharge from the aqueous mixture of the ions listec below :
$SO _4^{2-}, NO _3^{-}, OH ^{-}$

Answer

$OH^-$

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Question 31 Mark

Identify the substance underlined in each of the following case :
The particles present in a liquid such as kerosene, that is non-electrolyte.

Answer

The particles present in a liquid such as kerosene that is a non-electrolyte: Molecules

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Question 41 Mark

Identify the substance underlined in each of the following case :
he electrolyte used for electroplating an article with silver.

Answer

The electrolyte used for electroplating an article with silver: Sodium argentocyanide or potassium argentocyanide

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Question 51 Mark

Name the metallic ions that should be present in the electrolyte when an article made copper is to be electroplated with silver

Answer

$Ag^+$ and $Na^+$

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Question 61 Mark

Name the product formed at the anode during the electrolysis of acidified water using platinum electrodes

Answer

Oxygen is the product formed at the anode.

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Question 71 Mark

State one observation when electricity is passed through molten lead bromide.

Answer

Dark reddish brown fumes of bromine evolve at the anode and greyish white metal lead is formed on the cathode.

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Question 81 Mark

Give reasons as to why - the electrolysis of acidulated water is considered to be an example of catalysis.

Answer

Dilute sulphuric acid catalyses dissociation, so electrolysis of acidified water is considered an example of catalysis.

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Question 91 Mark

Find the odd one out from the following and explain your choice : $Al(OH)_3, Pb(OH)_2,Mg(OH)_2,Zn(OH)_2$

Answer

$Mg(OH)_2$ as it is basic while rest are amphoteric.

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Question 101 Mark

Why is carbon tetrachloride, which is a liquid, a non - electrolyte?

Answer

Carbon tetrachloride is a non-electrolyte as it is a covalent compound and contains only molecules.

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Question 111 Mark

A solution contains magnesium ions $\left( Mg ^{+2}\right)$, iron (II) ions $\left( Fe ^{+2}\right)$ and copper ions $\left( Cu ^{+2}\right)$. On passing an electric current through this solution which ions will be the first to be discharged at the cathode? Write the equation for the cathode reaction.

Answer

$Cu^{+2} $ will be discharged first.
$Cu^{+2} + 2e^- → Cu$

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Question 121 Mark

Here is an electrode reaction :
$Cu → Cu^{+2} + 2e^-$
At which electrode (anode or cathode) would such a reaction take place? Is this an example of oxidation?

Answer

The react ion takes place at anode. Yes, this is an example of oxidation.

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Question 131 Mark

Identify the following reactions as either oxidation or reduction : $Fe ^{+3}+ e ^{-} \rightarrow Fe ^{+2}$

Answer

Reduction

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Question 141 Mark

Identify the following reactions as either oxidation or reduction : $K - e ^{-} \rightarrow K ^{+}$

Answer

Oxidation

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Question 151 Mark

Identify the following reactions as either oxidation or reduction: $O +2 e ^{-} \rightarrow O ^{-2}$

Answer

Reduction

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Question 161 Mark

A strip of copper is placed in four different colourless salt solutions. They are $KNO _3, AgNO _3, Zn \left( NO _3\right)_2, Ca \left( NO _3\right)_2$. Which one of the solutions will finally turn blue?

Answer

$AgNO _3$ will turn blue.

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Question 171 Mark

Explain, why solid sodium chloride does not allow electricity to pass through?

Answer

In sodium chloride, $Na ^{+}$and $Cl ^{-}$ions are not free to carry the electric current.

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Question 181 Mark

Name the gas released at the cathode when acidulated water is electrolyzed.

Answer

Hydrogen is released at the cathode when acidulated water is electrolyzed.

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Question 191 Mark

Explain, why copper though a good conductor of electricity is, a non- electrolyte.

Answer

Copper metal is solid and has no mobile ions whereas an electrolyte should dissociate into oppositely charged ions to conduct the electric current.

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Question 201 Mark

What ions must be present in a solution used for electroplating a particular metal?

Answer

The ions of the metal which is to be electroplated on the article must be present in a solution.

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Question 211 Mark

If HX is a weak acid, what particles will be present in its dilute solution apart from those of water?

Answer

Non ionized molecules; $H ^{+}$and $X ^{-}$particles will be present in dilute solution.

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Question 221 Mark

What kind of particles will be found in a liquid compound which is a non- electrolyte?

Answer

Molecules are found in a liquid compound which is a non-electrolyte.

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Question 231 Mark

If a fused metallic chloride is electrolyzed, at which electrode would the metal be obtained?

Answer

When a fused metallic chloride is electrolyzed, the metal is obtained at cathode.

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Question 241 Mark

Correct the sentence by adding word(s)
The electrolysis of lead bromide liberates lead and bromine.

Answer

The electrolysis of lead bromide liberates lead at cathode and bromine at anode.

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Question 251 Mark

What should be the physical state of lead bromide if it is to conduct electricity?

Answer

Lead Bromide should be in the molten state if it has to conduct electricity.

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Question 261 Mark

Give one example of a substance which contain :
both ions and molecules.

Answer

Substance which contain
Both ions and molecules:- $CH _3 COOH$

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Question 271 Mark

Give one example of a substance which contain :
molecules only

Answer

Substance which contain
Molecules only :- Petrol

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Question 281 Mark

Give one example of a substance which contain :
Ions only

Answer

Substance which contain :
Ions only :- HCl

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Question 291 Mark

The following question relate to the electroplating of an article with silver.
What ions must be present in the electrolyte?

Answer

The ions of the metal which is to be electroplated must be present in the electrolyte.

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Question 301 Mark

The following question relate to the electroplating of an article with silver.
Name the electrode formed by the article which is to be plated.

Answer

The article to be plated must be made Cathode.

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Question 311 Mark

Amongst the $OH ^{-}$ions and $Br ^{-}$ions which are likely to discharge first?

Answer

$OH ^{-}$is likely to discharge first in comparison to Br ions.

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Question 321 Mark

$Al ^{+3}, Cu ^{+2}, Na ^{+}, Zn ^{+2}$ ions are present in aqueous solution, such that the concentration of ions is same, write the order of discharge of ions.

Answer

The order of discharge of ions is $Al ^{+3}, Cu ^{+2}, Na ^{+}, Zn ^{+2}$ because as the concentration is same, an ion placed lower in electrochemical series get preferentially discharged.

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Question 331 Mark

Explain the term : Anode mud

Answer

Anode mud : During electro refining some impurities which are insoluble fall down near the anode and is known as anode mud.

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Question 341 Mark

Explain the term : Electro metallurgy

Answer

Electro metallurgy : It is the process of extraction of metal from its ore through the use of electric current.

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Question 351 Mark

Explain the terms : Electro refining

Answer

Electro refining : It is the process of refining the impure metals through the use of electric current through the use of electric current or electrolysis.

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Question 361 Mark

Name : A non-metallic element which is a conductor of electricity.

Answer

Graphite

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Question 371 Mark

Name : A positively charged not metallic ion

Answer

$NH _4^{+}$

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Question 381 Mark

Name : An inert electrode and an active electrode

Answer

Graphite, Cu electrode

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Question 391 Mark

Name : A base which is not alkali

Answer

$NH_3$

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Question 401 Mark

Name : A salt which is a weak electrolyte.

Answer

$Na _2 CO _3$

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Question 411 Mark

State your observation for the following electrolytic reaction:
Solid copper sulphate is electrolysed between platinum electrodes.

Answer

When solid copper sulphate is electrolysed between platinum electrodes the electrolytic reaction will not take place as no electrolytes are formed in solid state.

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Question 421 Mark

The following question relate to the electroplating of an article with silver.
What should be the nature of the anode?

Answer

The metal to be plated on the article must be made anode. It needs to be periodically replaced.

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Chemistry [1 Mark Question Answer]

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