Chemistry Test 28

Result

Chemistry Test 28

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Weekly Quiz Competition

Question 1
4 / -1

Among the following oxoacids. The correct decreasing order of acid strength is:

A
HClO₄ > HClO₃ > HClO₂ > HOCl

B
HC1O₂ > HClO₄ > HClO₃ > HOCl

C
HOCl > HClO₂ > HClO₃ > HClO₄

D
HClO₄ > HOCl > HClO₂ > HClO₃

Solution

HClO < HClO₂ < HClO₃ < HClO₄
Increasing acid strength due to increase in oxidation state of central atom.
Hence, option A is correct.
Question 2
4 / -1

Several blocks of magnesium are fixed to the bottom of a ship to

A
keep away the sharks

B
make the ship lighter

C
prevent action of water and salt

D
prevent puncturing by under-sea rocks

Solution

Several blocks of magnesium are fixed to the bottom of a ship to prevent action of water and salt. This is because magnesium being more reactive than iron provides the cathodic protection and thus prevent rusting or corrosion.
Question 3
4 / -1

A binary liquid solution is prepared by mixing n-heptane and ethanol. Which one of the following statement is corret regarding the behaviour of the solution?

A
The solution formed is an ideal solution

B
The solution is non-ideal, showing +ve deviation from Raoult’s Law

C
The solution is non-ideal, showing –ve deviation from Raoult’s Law

D
n-heptane shows +ve deviation while ethanol shows –ve deviation from Raoult’s Law.

Solution

On mixing n-heptane and ethanol; strong interactions are replaced by weak interaction and hence it kes non-ideal solution with positive deviation.
Hence, option B is correct.