Some Basic Concepts of Chemistry Test

Result

Some Basic Concepts of Chemistry Test - 14

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Weekly Quiz Competition

Question 1
4 / -1

The number of molecules in 100 mL of each of O₂ ,NH₃ and CO₂ at STP are

A

B

C

D
Question 2
4 / -1

Which of the following represents the formula of a compound which contains 26% nitrogen and 74% oxygen ?

A
N₂O

B
NO

C
NO₂

D
N₂O₅

Solution
Question 3
4 / -1

A balanced chemical equation is in accordance with

A
Avogadro’s law

B
Law of constant proportions

C
Law of conservation of mass

D
Law of gaseous volumes
Question 4
4 / -1

The atomic weights of two elements X and Y are 20 and 40 respectively. If ‘a’ gm of X contains ‘b’ atoms, how many atoms are present in ‘2a’ gm of Y ?

A
b

B
a

C
2b

D
(a/b)

Solution
Question 5
4 / -1

Calculate the molarity of a solution obtained by mixing 50mL of 0.5M H₂SO₄ and 75 mL of 0.25M H₂SO₄.

A
0.375M

B
0.35M

C
0.045M

D
0.45M

Solution
Question 6
4 / -1

Which of the following has the highest normality ?

A
1M H₂SO₄

B
1M H₃PO₃

C
1M H₃PO₄

D
1M HNO₃
Question 7
4 / -1

A
i - q, ii - p, iii - r, iv - s

B
i - s, ii - q, iii - p, iv - r

C
i - q, ii - s, iii - p, iv - r

D
i - r, ii - s, iii - p, iv - q
Question 8
4 / -1

The total number of atoms of all elements present in mole of ammonium dichromate is

A
19

B
6.023 × 10²³

C
114.47 × 10²³

D
84 × 10²³

Solution
Question 9
4 / -1

0.32 gm of a metal on treatment with an acid gave 112 mL of hydrogen at STP. Calculate the equivalent weight of the metal

A
58

B
32

C
11.2

D
24

Solution
Question 10
4 / -1

100 mL of PH₃ on heating forms P and H₂ . The volume change in the reaction is

A
an increase of 50 mL

B
an increase of 100 mL

C
an increase of 150 ml

D
a decrease of 50 mL

Solution