Some Basic Concepts of Chemistry Test

Result

Some Basic Concepts of Chemistry Test - 4

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Question 1
4 / -1

For a reaction A + 2B → C, the amount of C formed by starting the reaction with 5 moles of A and 8 moles of B is

A
5 moles

B
8 moles

C
16 moles

D
4 moles
Question 2
4 / -1

An organic compound made of C, H, and N contains 20% nitrogen. Its molecular weight is

A
70

B
140

C
100

D
65
Question 3
4 / -1

Calculate the number of moles in 1m³ gas at STP.

A
4.46

B
44.6

C
446

D
4460

Solution
Question 4
4 / -1

Which of the following is not a homogeneous mixture ?

A
smoke

B
air

C
Brass

D
Aqueous solution of sugar
Question 5
4 / -1

Which of the following has the largest number of atoms ?

A
0.5g atom of Cu

B
0.635g of Cu

C
0.25 moles of Cu atom

D
1 g of Cu
Question 6
4 / -1

Specific volume of cylindrical virus particle is 6.02 × 10^–2 cc/gm. whose radius and length 7 Å & 10 Å respectively. If NA = 6.02 × 10²³, find molecular weight of virus

A
3.08 × 10³ kg/mol

B
3.08 × 10⁴ kg/mol

C
1.54 × 10⁴ kg/mol

D
15.4 kg/mol

Solution
Question 7
4 / -1

Four one–litre flasks are separately filled with the gases hydrogen, helium, oxygen and ozone at the same room temperature and pressure. The ratio of total number of atoms of these gases present in the different flasks would be

A
1 : 1 : 1 : 1

B
1 : 2 : 2 : 3

C
2 : 1 : 2 : 3

D
3 : 2 : 2 : 1
Question 8
4 / -1

If 0.5 mol of BaCl₂ is mixed with 0.2 mol of Na₃PO₄, the maximum number of moles of Ba₃ (PO₄)₂ that can be formed is

A
0.7

B
0.5

C
0.30

D
0.10

Solution
Question 9
4 / -1

Which one of the following properties of an element is not variable?

A
Valency

B
Atomic weight

C
Equivalent weight

D
All of the above
Question 10
4 / -1

If 10²¹ molecules are removed from 200 mg of CO₂, then the number of moles of CO₂ left are

A

B

C

D

Solution