Chemistry Test 163

Result

Chemistry Test 163

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Weekly Quiz Competition

Question 1
4 / -1

Which compound is obtained when acetaldehydes are treated with a dilute solution of caustic soda?

A
Sodium acetate

B
Resinous mass

C
Aldol

D
Ethyl acetate

Solution

Aldol is obtained by heating acetaldehyde molecules with dilute NaOH solutions.
Question 2
4 / -1

1 mole of ammonia is of 17 g. Then what is the mass of 0.3 moles of ammonia?

A
21 g

B
2.1 g

C
17 g

D
1 g

Solution

Given that, 1 mole of ammonia is of 17 g. 0.3 mole of ammonia contains 17 x 0.3g of mass. It is because the molecular weight of a given compound is directly proportional to the number of moles of the given compound.
Question 3
4 / -1

One mole of sucrose contains how many grams of sucrose?

A
340

B
341 g

C
342 g

D
343 g

Solution

One mole of sucrose C12H22O11 . The individual mass of carbon 12 amu, the individual mass of hydrogen is 1 amu and the individual mass of oxygen is 16 amu. But sucrose has 12 carbons, 22 hydrogens and 11 oxygens, that is 12 x 12 + 22 x 1 + 11 x 16 = 342 g
Question 4
4 / -1

When a gas is heated from 298 K to 323 K at a constant pressure of 1 atm its volume is

A
Increases from V to 1.8 V

B
Increases from V to 1.08 V

C
Increase from V to 1.5V

D
Increases from V to 2 V

Solution

According to Charles’ Law: At constant P and n,
Question 5
4 / -1

The correct order of magnitude of van der Waals constant b should be:

A
C2H6 < CO < CO2 < He

B
CO < C2H6 < He < CO2

C
C2H6 < CO2 < CO < He

D
He < CO < CO2 < C2H6
Question 6
4 / -1

molecules of urea are present in 100 mL of its solution. The concentration of urea solution is

A
0.001 M

B
0.01 M

C
0.02 M

D
0.03 M

Solution
Question 7
4 / -1

An aqueous solution of glucose is 20% in strength. The volume in which 1 g mole of it is dissolved will be

A
9 L

B
1.8 L

C
8 L

D
0.9 L

Solution
Question 8
4 / -1

A

B

C

D

Solution
Question 9
4 / -1

A
0.2

B
0.5

C
0.4

D
1.5

Solution
Question 10
4 / -1

Which of the following molecule doesn’t obey electron octet rule?

A
CO₂

B
H₂O

C
O₂

D
NO⁺

Solution