Chemistry Test 144

Result

Chemistry Test 144

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Weekly Quiz Competition

Question 1
4 / -1

The degree of association is given by the expression

A

B

C

D
Question 2
4 / -1

The average osmotic pressure of human blood is 7.8 bar at 37^oC. What is the concentration of an aqueous NaCl solution that could be used in blood stream?

A
0.15 mol/L

B
0.30 mol/L

C
0.45 mol/L

D
0.60 mol/L

Solution

Nacl should lie isotonic with

blood

π_blood=C_NaclRT×i

7.8 = C×0.0821 × 310 × 2

C = 0.153 mole⁻¹

The concentration of on

aqueous Nacl solution that

is used in blood stream

is 0.15 mol/L
Question 3
4 / -1

Which of the following ions has smallest radii ?

A

B

C

D
Question 4
4 / -1

The yellow colour of chromates changes to orange on acidification due to formation of

A

B
Cr₂O₃

C

D
Question 5
4 / -1

Which of the following is an acidic oxide ?

A
Mn₂O₇

B
Mn₃O₄

C
MnO

D
Question 6
4 / -1

Malachine is a mineral of

A
magnessium

B
copper

C
aluminium

D
iron
Question 7
4 / -1

The flux used in smelting of copper ores is

A
limestone

B
magnesia

C
silica

D
coke
Question 8
4 / -1

In the reaction between CuSO₄ and KI, a white precipitate is obtained. The precipitate has the composition

A

B

C

D
Question 9
4 / -1

An alloy which does not contain copper, is

A
solder

B
bell metal

C
bronze

D
brass
Question 10
4 / -1

Lucas reagent is

A

B

C

D