Chemical Reactions & Equations - 3


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QUESTION: 1

Which among the following statement(s) is (are) true?
Exposure of silver chloride to sunlight for a long duration turns grey due to
(i) The formation of silver by decomposition of silver chloride.
(ii) Sublimation of silver chloride.
(iii) Decomposition of chlorine gas from silver chloride.
(iv) Oxidation of silver chloride.

Solution:

Silver chloride turns grey due to the formation of silver by decomposition of silver chloride.

QUESTION: 2

Which of the following are combination reactions ?

(i) 2KClO2KCl + 3O2
(ii) MGO + H2O  →  Mg(OH)2
(iii) 4Al + 3O2  → 2Al2O3
(iv) Zn +FeSO4  → ​ZnSO4  +Fe

Solution:

Combination reactions are those in which two or more reactants react to give one product only.

QUESTION: 3

What is observed when a solution of potassium iodide is added to lead nitrate solution ?

Solution:

When a solution of potassium iodide is added to a solution of lead nitrate taken in a test tube, the precipitation of a yellowish solid is observed. This yellowish solid is lead iodide. Potassium nitrate is formed along with lead iodide.
This is an example of double displacement reaction.
Also , as yellow precipitate is formed , this is also an example of precipitation reaction

Balanced Equation: Pb(NO3)2 + 2KI → 2KNO3 + PbI2

QUESTION: 4

Barium chloride on reacting with ammonium sulphate forms barium sulphate and ammonium chloride. Which of the following correctly represents the type of the reaction involved ?
(i) Displacement reaction
(ii) Precipitation reaction
(iii) Combination reaction
(iv) Double displacement reaction

Solution:

In the given reaction, there is an exchange of ions between the reactants, thus it is a double displacement reaction. Also, white precipitate of barium sulphate is formed as a product, thus it is also an example of precipitation reaction.

QUESTION: 5

Which of the following statements about the given reaction are correct ?
3Fe(s) + 4H2O(g)  →  Fe3O4(g) + 6H(g)
(i) Iron metal is getting oxidised
(ii) Water is getting reduced
(iii) Water is acting as reducing agent
(iv) Water is acting as an oxidising agent

Solution:

Option (i) is correct as iron(Fe) is combining with oxygen to form iron(II,III) oxide(Fe2​O3​).
Option (ii) is correct as water(H2​O) is being reduced by removal of oxygen to form hydrogen (H2​) gas.
Option (iv) is correct as water(H2​O) itself is being reduced and is oxidising Iron(Fe), thereby acting as an oxidising agent.

QUESTION: 6

Which of the following is not a decomposition reaction ?

Solution:

A decomposition reaction occurs when an energy is supplied to a compound causing it to decompose (break down) into multiple different chemical substances.

But in 'C' it is a combination reaction

QUESTION: 7

The formula of Ammonium phosphate is 

Solution:

The formula of ammonium phosphate is 
( NH4) 3 PO4 . The salt compound consists of positively charged ammonium cations and phosphate anion which carries -3  formal charge.

QUESTION: 8

Which of the following reactions will not take place?

Solution:

Mg is more reactive than Zn. So Zn cannot displace Mg. Therefore,option C is the answer.

QUESTION: 9

Oxidation involves
(i) gain of electron
(ii) loss of electron
(iii) addition of oxygen or electronegative element
(iv) removal of hydrogen or electropositive element

Solution:

Oxidation process involves :-
Addition of O2 or electronegative element. 
Removal of H/ Electropositive element. 
Loss of electron.

QUESTION: 10

In the double displacement reaction between aqueous potassium iodide and aqueous lead nitrate, a yellow precipitate of lead iodide is formed. While performing the activity if lead nitrate is not available, which of the following can be used in place of lead nitrate?

Solution:

Lead sulphate being insoluble will not dissociate to give lead ions. Hence precipitation of lead iodide will not be possible with lead sulphate.

Lead acetate is a colourless compound. On coming in contact with potassium iodide crystal, the formation of lead iodide occurs that is bright yellow in colour.  Also, other salts, ammonium nitrate and potassium sulphate do not possess the lead ion, therefore lead iodide can not be formed using them.

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