Some Basic Concepts of Chemistry - 2

Question 1

Accepted Answer

4 mol

Answer

3 mol

Answer

1 mol

Answer

2 mol

Question 2

The volume of 1.204 × 10²⁴ molecules of water at 4ºC is …………… (ml)

Accepted Answer

36

Answer

18

Answer

48

Answer

32

Question 3

There are two common oxides of Sulphur, one of which contains 50% O₂ by weight, the other almost exactly 60%. The weights of sulphur
which combine with 1 g of O₂ (fixed) are in the ratio of -

Accepted Answer

3 : 2

Answer

1 : 1

Answer

2 : 1

Answer

2 : 3

Question 4

The largest number of molecules is in -

Accepted Answer

36 g of water

Answer

28 g of CO₂

Answer

46 g of CH₃OH

Answer

58 g of N₂O₅

Question 5

Accepted Answer

Answer

Answer

Answer

Question 6

Accepted Answer

Answer

Answer

Answer

Question 7

In an ionic compound moles ratio of cation to anion is 1 : 2. If atomic masses of metal and non-metal respectively are 138 and 19, then
correct statement is -

Accepted Answer

formula mass of compound is 176

Answer

molecular mass of compound is 176

Answer

formula mass of compound is 157

Answer

molecular mass of compound is 157

Question 8

The number of atoms of Cr and O are 4.8 × 10¹⁰ and 9.6 × 10¹⁰ respectively. Its empirical formula is -

Accepted Answer

CrO2

Answer

Cr2O3

Answer

Cr2O4

Answer

None of these

Question 9

Iron forms two oxides, in first oxide 56 gram. Iron is found to be combined with 16 gram oxygen and in second oxide 112 gram iron is
found to be combined with 48 gram oxygen. This data satisfy the law of -

Accepted Answer

Multiple proportion

Answer

Conservation of mass

Answer

Reciprocal proportion

Answer

Combining volume

Question 10

How many moles of lead (II) chloride will be formed from the reaction between 6.5 g of PbO and 3.2 g of HCl?

Accepted Answer

0.029

Answer

0.011

Answer

0.044

Answer

0.333

Question 11

Accepted Answer

200 amu

Answer

201 amu

Answer

202 amu

Answer

199 amu

Question 12

0.2 mole of HCl and 0.1 mole of barium chloride were dissolved in water to produce a 500-mL solution. The molarity of the Cl^– ions is -

Accepted Answer

0.80 M

Answer

0.06 M

Answer

0.09 M

Answer

0.12 M

Question 13

A vessel contains 8 gram TiO₂, 2.4 gram carbon and 28.4 gram Cl₂. Maximum mass of TiCl₄ which can be produced is -
3TiO₂(s) + 4C(s) + 6Cl₂(g) → 3TiCl₄(g) + 2CO₂(g) + 2CO(g)
(Consider reaction goes to completion ; atomic mass of Ti = 48)

Accepted Answer

19 gram

Answer

1.90 gram

Answer

28.5 gram

Answer

38 gram

Question 14

The mole fraction of a given sample of I₂ in C₆H₆ is 0.2. The molality of I₂ in C₆H₆ is -

Accepted Answer

3.2

Answer

0.32

Answer

0.032

Answer

0.48

Question 15

The number of molecules present in 88 g of CO₂ (Relative molecular mass of CO₂ = 44)

Accepted Answer

1.2046 × 10²⁴

Answer

1.24 × 10²³

Answer

3.01 × 10²³

Answer

6.023 × 10²⁴

Question 16

Accepted Answer

1 N

Answer

0.1 N

Answer

5 N

Answer

0.5 N

Question 17

When 20 ml of pure acetic acid (density = 0.75 gm ml^–1) is mixed with 50 gm of water (density = 1gm ml^–1) at a certain temperature. Calculate the molality of acetic acid in the final solution.

Accepted Answer

5

Answer

2

Answer

3

Answer

4

Question 18

If N_A is Avogadro number, then the number of valence electrons in 4.2 g of N^3– ions is -

Accepted Answer

2.4 NA

Answer

4.2 NA

Answer

1.6 NA

Answer

3.2 NA

Question 19

12g of Mg (atm. mass 24) will react completely with acid to give -

Accepted Answer

1/2 mol of H₂

Answer

One mol of H₂

Answer

2/3 mol of O₂

Answer

Both 1/2 mol of H₂ and 1/2 mol of O₂

Question 20

Accepted Answer

1.2 × 10²³

Answer

6 × 10²²

Answer

6 × 10²³

Answer

12 × 10²³

Question 21

The iron atoms in 1720 amu of ferric ferrocyanide is .....................

Accepted Answer

14

Answer

12

Answer

16

Answer

28

Question 22

Accepted Answer

Answer

Answer

Answer

Question 23

Accepted Answer

Cl–

Answer

Ne2+

Answer

Be+

Answer

As+

Question 24

When 20 ml of pure acetic acid (density = 0.75 gm ml^–1) is mixed with 50 gm of water (density = 1gm ml^–1) at a certain temperature. Calculate the molality of acetic acid in the final solution.

Accepted Answer

5

Answer

15

Answer

10

Answer

20

Question 25

Calculate percentage change in M_avg of the mixture, if PCl₅ undergo 50% decomposition.

PCl₅ → PCl₃ + Cl₂

Accepted Answer

33.33 %

Answer

50%

Answer

66.66 %

Answer

Zero

Question 26

Molarity of aqueous NaOH solution will be, if mole fraction of NaOH in the solution is 0.5. [Given : density of pure NaOH = 4 gm/ml]

Accepted Answer

35.71

Answer

76.92

Answer

68.96

Answer

26.46

Question 27

Accepted Answer

1.910 M and 0.955 M

Answer

0.955 M and 1.910 M

Answer

1.90 M and 1.910 M

Answer

0.477 M and 0.477 M

Question 28

2 moles of Al react with 3 moles of Cl₂ to form AlCl₃. What will be the limiting reagent, and how many moles of AlCl₃ will be formed?

Accepted Answer

Al, 2 moles

Answer

Cl₂, 3 moles

Answer

Al, 1 mole

Answer

Cl₂, 2 moles

Question 29

A compound contains 50% sulfur and 50% oxygen by mass. What is the empirical formula of the compound?

Accepted Answer

S&#8203;O2

Answer

SO

Answer

S2&#8203;O3&#8203;

Answer

SO3

Question 30

A sample contains 3 mol of N₂ and 2mol of H₂. What is the total number of molecules in the sample?

Accepted Answer

3.0×10²⁴

Answer

2.4×10²⁴

Answer

2.0×10²⁴

Answer

4.0×10²⁴

Some Basic Concepts of Chemistry - 2 - Free MCQ Test with solutions

MCQ Practice Test & Solutions: Some Basic Concepts of Chemistry - 2 (30 Questions)

The volume of 1.204 × 10²⁴ molecules of water at 4ºC is …………… (ml)

There are two common oxides of Sulphur, one of which contains 50% O₂ by weight, the other almost exactly 60%. The weights of sulphur
which combine with 1 g of O₂ (fixed) are in the ratio of -

The largest number of molecules is in -

In an ionic compound moles ratio of cation to anion is 1 : 2. If atomic masses of metal and non-metal respectively are 138 and 19, then
correct statement is -

The number of atoms of Cr and O are 4.8 × 10¹⁰ and 9.6 × 10¹⁰ respectively. Its empirical formula is -

Iron forms two oxides, in first oxide 56 gram. Iron is found to be combined with 16 gram oxygen and in second oxide 112 gram iron is
found to be combined with 48 gram oxygen. This data satisfy the law of -

How many moles of lead (II) chloride will be formed from the reaction between 6.5 g of PbO and 3.2 g of HCl?

0.2 mole of HCl and 0.1 mole of barium chloride were dissolved in water to produce a 500-mL solution. The molarity of the Cl^– ions is -

A vessel contains 8 gram TiO₂, 2.4 gram carbon and 28.4 gram Cl₂. Maximum mass of TiCl₄ which can be produced is -
3TiO₂(s) + 4C(s) + 6Cl₂(g) → 3TiCl₄(g) + 2CO₂(g) + 2CO(g)
(Consider reaction goes to completion ; atomic mass of Ti = 48)

The mole fraction of a given sample of I₂ in C₆H₆ is 0.2. The molality of I₂ in C₆H₆ is -

The number of molecules present in 88 g of CO₂ (Relative molecular mass of CO₂ = 44)

When 20 ml of pure acetic acid (density = 0.75 gm ml^–1) is mixed with 50 gm of water (density = 1gm ml^–1) at a certain temperature. Calculate the molality of acetic acid in the final solution.

If N_A is Avogadro number, then the number of valence electrons in 4.2 g of N^3– ions is -

12g of Mg (atm. mass 24) will react completely with acid to give -

The iron atoms in 1720 amu of ferric ferrocyanide is .....................

When 20 ml of pure acetic acid (density = 0.75 gm ml^–1) is mixed with 50 gm of water (density = 1gm ml^–1) at a certain temperature. Calculate the molality of acetic acid in the final solution.

Calculate percentage change in M_avg of the mixture, if PCl₅ undergo 50% decomposition.
PCl₅ → PCl₃ + Cl₂

Molarity of aqueous NaOH solution will be, if mole fraction of NaOH in the solution is 0.5. [Given : density of pure NaOH = 4 gm/ml]

2 moles of Al react with 3 moles of Cl₂ to form AlCl₃. What will be the limiting reagent, and how many moles of AlCl₃ will be formed?

A compound contains 50% sulfur and 50% oxygen by mass. What is the empirical formula of the compound?

A sample contains 3 mol of N₂ and 2mol of H₂. What is the total number of molecules in the sample?

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Some Basic Concepts of Chemistry - 2 - Free MCQ Test with solutions

MCQ Practice Test & Solutions: Some Basic Concepts of Chemistry - 2 (30 Questions)

The volume of 1.204 × 1024 molecules of water at 4ºC is …………… (ml)

There are two common oxides of Sulphur, one of which contains 50% O2 by weight, the other almost exactly 60%. The weights of sulphurwhich combine with 1 g of O2 (fixed) are in the ratio of -

The largest number of molecules is in -

In an ionic compound moles ratio of cation to anion is 1 : 2. If atomic masses of metal and non-metal respectively are 138 and 19, thencorrect statement is -

The number of atoms of Cr and O are 4.8 × 1010 and 9.6 × 1010 respectively. Its empirical formula is -

Iron forms two oxides, in first oxide 56 gram. Iron is found to be combined with 16 gram oxygen and in second oxide 112 gram iron is found to be combined with 48 gram oxygen. This data satisfy the law of -

​How many moles of lead (II) chloride will be formed from the reaction between 6.5 g of PbO and 3.2 g of HCl?

0.2 mole of HCl and 0.1 mole of barium chloride were dissolved in water to produce a 500-mL solution. The molarity of the Cl– ions is -

A vessel contains 8 gram TiO2, 2.4 gram carbon and 28.4 gram Cl2. Maximum mass of TiCl4 which can be produced is -3TiO2(s) + 4C(s) + 6Cl2(g) → 3TiCl4(g) + 2CO2(g) + 2CO(g)(Consider reaction goes to completion ; atomic mass of Ti = 48)

The mole fraction of a given sample of I2 in C6H6 is 0.2. The molality of I2 in C6H6 is -

The number of molecules present in 88 g of CO2 (Relative molecular mass of CO2 = 44)

When 20 ml of pure acetic acid (density = 0.75 gm ml–1) is mixed with 50 gm of water (density = 1gm ml–1) at a certain temperature. Calculate the molality of acetic acid in the final solution.

If NA is Avogadro number, then the number of valence electrons in 4.2 g of N3– ions is -

12g of Mg (atm. mass 24) will react completely with acid to give -

The iron atoms in 1720 amu of ferric ferrocyanide is .....................

When 20 ml of pure acetic acid (density = 0.75 gm ml–1) is mixed with 50 gm of water (density = 1gm ml–1) at a certain temperature. Calculate the molality of acetic acid in the final solution.

Calculate percentage change in Mavg of the mixture, if PCl5 undergo 50% decomposition.PCl5 → PCl3 + Cl2

Molarity of aqueous NaOH solution will be, if mole fraction of NaOH in the solution is 0.5. [Given : density of pure NaOH = 4 gm/ml]

2 moles of Al react with 3 moles of Cl2 to form AlCl3​. What will be the limiting reagent, and how many moles of AlCl3​ will be formed?

A compound contains 50% sulfur and 50% oxygen by mass. What is the empirical formula of the compound?

A sample contains 3 mol of N2 and 2mol of H2​. What is the total number of molecules in the sample?

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About this JEE Practice Test

Explore more JEE Study Resources

The volume of 1.204 × 10²⁴ molecules of water at 4ºC is …………… (ml)

There are two common oxides of Sulphur, one of which contains 50% O₂ by weight, the other almost exactly 60%. The weights of sulphur
which combine with 1 g of O₂ (fixed) are in the ratio of -

In an ionic compound moles ratio of cation to anion is 1 : 2. If atomic masses of metal and non-metal respectively are 138 and 19, then
correct statement is -

The number of atoms of Cr and O are 4.8 × 10¹⁰ and 9.6 × 10¹⁰ respectively. Its empirical formula is -

Iron forms two oxides, in first oxide 56 gram. Iron is found to be combined with 16 gram oxygen and in second oxide 112 gram iron is
found to be combined with 48 gram oxygen. This data satisfy the law of -

How many moles of lead (II) chloride will be formed from the reaction between 6.5 g of PbO and 3.2 g of HCl?

0.2 mole of HCl and 0.1 mole of barium chloride were dissolved in water to produce a 500-mL solution. The molarity of the Cl^– ions is -

A vessel contains 8 gram TiO₂, 2.4 gram carbon and 28.4 gram Cl₂. Maximum mass of TiCl₄ which can be produced is -
3TiO₂(s) + 4C(s) + 6Cl₂(g) → 3TiCl₄(g) + 2CO₂(g) + 2CO(g)
(Consider reaction goes to completion ; atomic mass of Ti = 48)

The mole fraction of a given sample of I₂ in C₆H₆ is 0.2. The molality of I₂ in C₆H₆ is -

The number of molecules present in 88 g of CO₂ (Relative molecular mass of CO₂ = 44)

When 20 ml of pure acetic acid (density = 0.75 gm ml^–1) is mixed with 50 gm of water (density = 1gm ml^–1) at a certain temperature. Calculate the molality of acetic acid in the final solution.

If N_A is Avogadro number, then the number of valence electrons in 4.2 g of N^3– ions is -

When 20 ml of pure acetic acid (density = 0.75 gm ml^–1) is mixed with 50 gm of water (density = 1gm ml^–1) at a certain temperature. Calculate the molality of acetic acid in the final solution.

Calculate percentage change in M_avg of the mixture, if PCl₅ undergo 50% decomposition.
PCl₅ → PCl₃ + Cl₂

2 moles of Al react with 3 moles of Cl₂ to form AlCl₃. What will be the limiting reagent, and how many moles of AlCl₃ will be formed?

A sample contains 3 mol of N₂ and 2mol of H₂. What is the total number of molecules in the sample?