NEET Previous Year Questions: Some Basic Concepts Of Chemistry

Question 1

20 ml of decinormal solution of NaOH neutralises 25 ml of a solution of dibasic acid containing 3g. of the acid per 500 ml. The Molecular weight of the acid is

Accepted Answer

150

Answer

75

Answer

225

Answer

300

Question 2

In a compound C, H and N are present in the ratio 9: 1: 3.5 by weight. Molecular mass of the compound is 108. Molecular formula of the compound is:

Accepted Answer

C₆H₈N₂

Answer

C₂H₆N₂

Answer

C3H4N

Answer

C₉H₁₂N₃

Question 3

Number of atoms is 560 g of Fe (atomic mass = 56 g mol^_-1)

Accepted Answer

Both are correct

Answer

Is twice that of 70 g N (Nitrogen)

Answer

Is half that of 20 g H(Hydrogen)

Answer

none is correct

Question 4

What volume of hydrogen gas at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g elemental boron (atomic mass = 10.8) from the reduction of boron trichloride by hydrogen?

Accepted Answer

67.2L

Answer

44.8L

Answer

22.4 L

Answer

89.6 L

Question 5

One mole of magnesium nitride on reaction with an excess of water gives

Accepted Answer

Two moles of ammonia

Answer

One mole of ammonia

Answer

Two moles of nitric acid

Answer

One moles of nitric acid

Question 6

How many moles of magnesium phosphate, Mg₃ (PO₄)₂ will contain 0.25 mole of oxygen atoms?

Accepted Answer

3.125 × 10^-2

Answer

1.25 × 10^-2

Answer

2.5 × 10^-2

Answer

0.02

Question 7

In the reaction, 2Al (s) + 6HCl (aq) → 2Al³⁺ (aq) + 6Cl^- (aq) + 3H₂(g)

Accepted Answer

11.2 L H₂ (g) at STP is produced for every mole HCl (aq) consumed

Answer

33.36 L H₂(g) is produced regardless of temperature & pressure per mole Al that reacts

Answer

67.2 L H₂ (g) at STP is produced for every mole of Al that reacts

Answer

6 L HCl (aq) is consumed for every 3 L H₂(g) is produced.

Question 8

Volume occupied by one molecule of water (density = 1 g cm^-3) is

Accepted Answer

3.0 × 10^-²³ cm³

Answer

9.0 × 10^-²³cm³

Answer

6.023 × 10^-²³ cm³

Answer

5.5 × 10^-²³ cm³

Question 9

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

Accepted Answer

0.029

Answer

0.044

Answer

0.333

Answer

0.011

Question 10

100mL of PH3 on heating forms P4 and H2, volume changes in the reaction is:

Accepted Answer

an increase of 50 ml.

Answer

an increase of 100 ml.

Answer

an increase of 150 ml.

Answer

an decrease of 50 ml.

Question 11

Excess of carbon dioxide is passed through 50 mL of 0.5 M calcium hydroxide solution. After the composition of the reaction, the solution was evaporated to dryness. The solid calcium carbonate was completely neutralized with 0.1 N hydrochloric acid. The volume of the hydrochloric acid required is___________

Accepted Answer

500ml

Answer

200ml

Answer

400ml

Answer

300ml

Question 12

25.3 g of sodium carbonate, Na₂CO₃ is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ions, Na⁺ and carbonate ions, are respectively. (At. mass of carbon = 40)

Accepted Answer

1.910 M and 0.955 M

Answer

0.477 M and 0.477 M

Answer

0.955 M and 1.910 M

Answer

1.90 M and 1.910 M

Question 13

The number of atoms in 0.1 mol of a triatomic gas is

Accepted Answer

1.806× 10²³

Answer

1.800 × 10²²

Answer

6.026 × 10²²

Answer

3.600 × 10²²

Question 14

How much time (in hours) would it take to distribute one Avogadro number of wheat grains if 10²⁰ grains are distributed each second?

Accepted Answer

1.673

Answer

0.1673

Answer

16.73

Answer

167.3

Question 15

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

Accepted Answer

4 moles

Answer

5 moles

Answer

8 moles

Answer

16 moles

Question 16

A mixture of CaCl₂ and NaCl weighing 4.44 g is treated with sodium carbonate solution to precipitate all the Ca²⁺ ions as calcium carbonate. The CaCO₃ so obtained is heated strongly to get 0.56 g of CaO. The percentage of NaCl in the mixture is

Accepted Answer

75

Answer

30.6

Answer

25

Answer

69.4

Question 17

If 1 mL of water contains 20 drops, then number of molecules in a drop of water is

Accepted Answer

1.673× 10²¹

Answer

6.023× 10²³

Answer

1.376× 10²⁶

Answer

4.346× 10²⁰

Question 18

In an experiment, 4 g of M₂Ox oxide was reduced to 2.8g of the metal.Tf the atomic mass of the metal is 56 g mol-1, the number of O atoms in the oxide is

Accepted Answer

3

Answer

1

Answer

2

Answer

4

Question 19

Which has the maximum number of molecules among the following?

Accepted Answer

8g H2

Answer

44g CO2

Answer

48g O3

Answer

64g SO2

Question 20

The density of a solution prepared by dissolving 120 g of urea in 1000 g of water is 1.15 g/ml. The molarity of this solution is:

Accepted Answer

2.05 M

Answer

0.50 M

Answer

1.78 M

Answer

1.02 M

NEET Previous Year Questions: Some Basic Concepts Of Chemistry Free MCQ

MCQ Practice Test & Solutions: NEET Previous Year Questions: Some Basic Concepts Of Chemistry (20 Questions)

20 ml of decinormal solution of NaOH neutralises 25 ml of a solution of dibasic acid containing 3g. of the acid per 500 ml. The Molecular weight of the acid is

In a compound C, H and N are present in the ratio 9: 1: 3.5 by weight. Molecular mass of the compound is 108. Molecular formula of the compound is:

Number of atoms is 560 g of Fe (atomic mass = 56 g mol^_-1)

What volume of hydrogen gas at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g elemental boron (atomic mass = 10.8) from the reduction of boron trichloride by hydrogen?

One mole of magnesium nitride on reaction with an excess of water gives

How many moles of magnesium phosphate, Mg₃ (PO₄)₂ will contain 0.25 mole of oxygen atoms?

In the reaction, 2Al (s) + 6HCl (aq) → 2Al³⁺ (aq) + 6Cl^- (aq) + 3H₂(g)

Volume occupied by one molecule of water (density = 1 g cm^-3) is

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

100mL of PH3 on heating forms P4 and H2, volume changes in the reaction is:

25.3 g of sodium carbonate, Na₂CO₃ is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ions, Na⁺ and carbonate ions, are respectively. (At. mass of carbon = 40)

The number of atoms in 0.1 mol of a triatomic gas is

How much time (in hours) would it take to distribute one Avogadro number of wheat grains if 10²⁰ grains are distributed each second?

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 mixture of CaCl₂ and NaCl weighing 4.44 g is treated with sodium carbonate solution to precipitate all the Ca²⁺ ions as calcium carbonate. The CaCO₃ so obtained is heated strongly to get 0.56 g of CaO. The percentage of NaCl in the mixture is

If 1 mL of water contains 20 drops, then number of molecules in a drop of water is

In an experiment, 4 g of M₂Ox oxide was reduced to 2.8g of the metal.Tf the atomic mass of the metal is 56 g mol-1, the number of O atoms in the oxide is

Which has the maximum number of molecules among the following?

The density of a solution prepared by dissolving 120 g of urea in 1000 g of water is 1.15 g/ml. The molarity of this solution is:

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NEET Previous Year Questions: Some Basic Concepts Of Chemistry Free MCQ

MCQ Practice Test & Solutions: NEET Previous Year Questions: Some Basic Concepts Of Chemistry (20 Questions)

20 ml of decinormal solution of NaOH neutralises 25 ml of a solution of dibasic acid containing 3g. of the acid per 500 ml. The Molecular weight of the acid is

In a compound C, H and N are present in the ratio 9: 1: 3.5 by weight. Molecular mass of the compound is 108. Molecular formula of the compound is:

Number of atoms is 560 g of Fe (atomic mass = 56 g mol-1)

What volume of hydrogen gas at 273 K and 1 atm pressure will be consumed in obtaining 21.6 g elemental boron (atomic mass = 10.8) from the reduction of boron trichloride by hydrogen?

One mole of magnesium nitride on reaction with an excess of water gives

How many moles of magnesium phosphate, Mg3 (PO4)2 will contain 0.25 mole of oxygen atoms?

In the reaction, 2Al (s) + 6HCl (aq) → 2Al3+ (aq) + 6Cl- (aq) + 3H2(g)

Volume occupied by one molecule of water (density = 1 g cm-3) is

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

100mL of PH3 on heating forms P4 and H2, volume changes in the reaction is:

25.3 g of sodium carbonate, Na2CO3 is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ions, Na+ and carbonate ions, are respectively. (At. mass of carbon = 40)

The number of atoms in 0.1 mol of a triatomic gas is

How much time (in hours) would it take to distribute one Avogadro number of wheat grains if 1020 grains are distributed each second?

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 mixture of CaCl2 and NaCl weighing 4.44 g is treated with sodium carbonate solution to precipitate all the Ca2+ ions as calcium carbonate. The CaCO3 so obtained is heated strongly to get 0.56 g of CaO. The percentage of NaCl in the mixture is

If 1 mL of water contains 20 drops, then number of molecules in a drop of water is

In an experiment, 4 g of M2Ox oxide was reduced to 2.8g of the metal.Tf the atomic mass of the metal is 56 g mol-1, the number of O atoms in the oxide is

Which has the maximum number of molecules among the following?

The density of a solution prepared by dissolving 120 g of urea in 1000 g of water is 1.15 g/ml. The molarity of this solution is:

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Number of atoms is 560 g of Fe (atomic mass = 56 g mol^_-1)

How many moles of magnesium phosphate, Mg₃ (PO₄)₂ will contain 0.25 mole of oxygen atoms?

In the reaction, 2Al (s) + 6HCl (aq) → 2Al³⁺ (aq) + 6Cl^- (aq) + 3H₂(g)

Volume occupied by one molecule of water (density = 1 g cm^-3) is

25.3 g of sodium carbonate, Na₂CO₃ is dissolved in enough water to make 250 mL of solution. If sodium carbonate dissociates completely, molar concentration of sodium ions, Na⁺ and carbonate ions, are respectively. (At. mass of carbon = 40)

How much time (in hours) would it take to distribute one Avogadro number of wheat grains if 10²⁰ grains are distributed each second?

A mixture of CaCl₂ and NaCl weighing 4.44 g is treated with sodium carbonate solution to precipitate all the Ca²⁺ ions as calcium carbonate. The CaCO₃ so obtained is heated strongly to get 0.56 g of CaO. The percentage of NaCl in the mixture is

In an experiment, 4 g of M₂Ox oxide was reduced to 2.8g of the metal.Tf the atomic mass of the metal is 56 g mol-1, the number of O atoms in the oxide is