Chemistry Test 6

Result

Chemistry Test 6

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Weekly Quiz Competition

Question 1
4 / -1

Which has the highest weight?

A
1 m³ water

B
10 litre of Hg (density of Hg = 13.6 gm/mL)

C
A normal adult man

D
All have same weight

Solution

1m³ H₂O = 1000 kg

10l HgO = 136 kg

About = 70 – 80 kg
Question 2
4 / -1

Manganese show oxidation state from + 2 to + 7. The most oxidizing state known in aqueous solution is

A
+ 7

B
+ 4

C
+ 3

D
+ 2

Solution

The most oxidizing state in a solution of Mn is +7 (KMnO₄)
Question 3
4 / -1

Consider the reaction, 2A + B → Products ,

When concentration of B alone was doubled, the half-life did not change. When the concentration of A alone was doubled, the rate increased by two times. The unit of rate constant for this reaction is

A
mol L^–1s^–1

B
s^–1

C
L mol^–1s^–1

D
no unit

Solution

Rate = K[A]^α [B]^β; t_1/2 is constant w.r.t. [A] ⇒ B = 1

and rate α [A] ⇒ α = 1,

∴ order of reaction = 2

∴ units of k = L. mole^–1 sec^–1