Chemistry Test 34

Result

Chemistry Test 34

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Weekly Quiz Competition

Question 1
4 / -1

The concentration of fluoride, lead, nitrate and iron in a water sample from an underground lake was found to be 1000 ppb, 40 ppb, 100 ppm and 0.2 ppm, respectively. This water is unsuitable for drinking due to high concentration of :

A
Nitrate

B
Iron

C
Fluoride

D
Lead

Solution

The permissible limit for Nitrate to be present in drinking water is 50 parts per million.
Hence option A is correct.
Question 2
4 / -1

The most powerful oxidant among the following is

A
HClO

B
HClO₂

C
HClO₃

D
HClO₄

Solution

Lower the oxidation state of chlorine, higher will be the oxidising power of its oxyacid. In HClO the oxidation state of chlorine is the least, so it will have the highest oxidising power among the given oxyacids.
Question 3
4 / -1

The species which can best serve as an initiator for the cationic polymerization is :

A
LiAIH₄

B
HNO₃

C
AICI₃

D
C₄H₉Li

Solution

Lewis acids can initiate the cationic polymerization.
Hence, option C is correct.