Some Basic Concepts of Chemistry Test

Result

Some Basic Concepts of Chemistry Test - 9

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Weekly Quiz Competition

Question 1
4 / -1

A compound contains atoms of three elements in A, B and C. If the oxidation number of A is +2, B is +5 and that of C is -2, the possible formula of the compound is

A
A₃(BC₄)₂

B
A₃(B₄C)₂

C
ABC₂

D
A₂(BC₃)₂
Question 2
4 / -1

An aqueous solution of 6.3 g of oxalic acid dihydrate is made up to 250 ml. The volume of 0.1 N NaOH required to completely neutralise 10 ml of this solution is

A
40 ml

B
20 ml

C
10 ml

D
4 ml

Solution
Question 3
4 / -1

A
1, 1, 2, 2, 1

B
2, 2, 1, 1, 1

C
2, 1, 1, 2, 1

D
2, 2, 1, 2, 1

Solution
Question 4
4 / -1

Among the following pairs of compounds, the one that illustrates the law of multiple proportions is

A
NH₃ and NCl₃

B
H₂S and SO₂

C
CuO and Cu₂O

D
CS₂ and FeSO₄
Question 5
4 / -1

Irrespective of the source, pure sample of water always yields 88.89% mass of oxygen and 11.11% mass of hydrogen. This is explained by the law of

A
conservation of mass

B
constant composition

C
multiple proportions

D
constant volume
Question 6
4 / -1

If 224 ml of a triatomic gas has a mass of 1 g at 273 K and 1 atm pressure, then the mass of one atom is

A

B

C

D

Solution
Question 7
4 / -1

If isotopic distribution of C -12 and C -14 is 98% and 2% respectively, then the number of C-14 atoms in 12 g of carbon is

A

B

C

D

Solution
Question 8
4 / -1

4.0 g of caustic soda (mol.mass 40) contains same number of sodium ions as are present in :

A
10.6 g of Na₂CO₃ (mol. mass 106)

B
58.5g of NaCl (formula mass 58.5)

C
100 ml of 0.5 M Na₂SO₄ (formula mass 142)

D
1 gm equivalent of Na NO₃ (mol. mass 85 )

Solution
Question 9
4 / -1

Number of atoms in 558.5 g Fe (at wt. of Fe = 55.85 g mol^-1) is

A
twice that in 60 g carbon

B

C
half that in 8 g He

D

Solution
Question 10
4 / -1

Which has maximum number of atoms ?

A
24 g of C (12)

B
56 g of Fe (56)

C
27 g of Al (27)

D
108 g of Ag (108)

Solution