Chapter 04 - MCQs Test | Chapter 04 Notes

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Q.1
Which one of the following statements is incorrect?

(a) 22g of COz (b) 88g of N20 (c) 28g of CO (d) 28g of N2

Q.2
6.02 × 10^23. The number of CF ions are:

(a) 6.6.02 × 10^23 (b) 3.01 x 1023 (c) 12.12.04 × 10^23 (d) 1.5 x 1023

Q.4
Which of the following contains same number of particles as present in 12g of carbon?

(a) 28g of iron (Atomic mass of Fe = 56) (b) 48g of magnesium (Atomic mass of Mg = 24) (c) 32g of Ss molecules (Atomic mass S= 32) (d) 44g of carbon dioxide (molar mass of CO2 = 44)

Q.5
Volume at S.T.P of 22g of CO2 is same as that of:

(a) 2g of hydrogen (b) 8.5g of NH3 (c) 64g of gaseous SO2 (d) 7g of CO

Q.6
4.0g of NaOH (molar mass 40g mol) contains same number of sodium ions as are present in:

(a) 5.3g of Na2CO3, (molar mass 106) (b) 58.5 g of Nacl (molar mass 58.5) (c) 76g Na2SO4 (formula mass I42) (d) 85g of NaNO3 (molar mas 85)

Q.7
A container holds 0.5 moles of an ideal gas at STP. What is the volume of the gas in dm?

(a) 11.2 dm (b) 22.4 dm (c) 44.8 dm3" (d) 12.2 dm

Q.8
A solution contains 4.0g of sodium hydroxide (NaOH, molar mass = 40.0g mol-1) in 250 cm3? of solution. What is the molar concentration of this solution?

(a) 0.10 mol dm3 (b) 0.20 mol dm (c) 0.40 mol dm3 (d) 0.80 mol dm3

Q.9
A solution contains 10.0g of an unknown solute in 250 cm of solution. If the molar concentration of the solution is 0.20 mol dm3 , What is the molar mass of the solute?

(a) 50g mol-1 (b) 100g mol-1 (c) 200g mol-1 (d) 400g mol

Q.10
A sample of nitrogen gas (N2, molar mass = 28.0g mol) has a mass of 14.0g. How many nitrogen atoms are present in this sample?

(a) 3.01 × 1023 atoms (b) .6.02 x 102 atoms (c) 1.20 × 1024 atoms (d) 2.40 × 1024 atoms SLO BASED MULTIPLE CHOICE QUESTIONS Concept of Mole

Q.11
A gas has a density of 1.43g dm3 at STP. What is the molar mass of the gas? (Molar volume at STP = 22.4 dm mol-1)

(a) 14.3g mol-1 (b) 22.4g mol (c) 32.0g mol (d) 64.0g mol-1

Q.12
A gas has a density of 1.96g dm3 at STP (0°C and 1.00 atm). What is its molecular mass? (Molar volume at STP = 22.4 dm mol-1)

(a) 11.2g mol-1 (b) 22.4g mol-1 (c) 44.0g mol-1 (d) 88.0g mol

Q.12
12.04 × 10^23 molecules of CO?

(a) 0.5 mole (b) 1.0 mole (c) 2 x 1023 moles (d) 2.0 moles

Q.13 The mass of one mole of electron is:

(a) 1.088 mg (b) 0.55 mg (c) 0.184 mg (d) 1.67 mg

Q.14
The number of moles of CO2 which contain 8g of oxygen:

(a) 0.25 (b) 0.5 (c) 1.0 (d) 1.50

Q.15 One mole of carbon-12 has mass:

(a) 0.012 kg (b) 1 kg (c) .0.0224 kg (d) 12 kg

Q.16 The mass of one mole of chlorine gas is:

(a) 35.5 g (b) 71 g (c) 23 g (d) 32 g

Q.17
What are the number of moles of of CHa? hydrogen atom in 3.2g (Relative atomic mass of C = 12)

(a) 0.2 (b) 0.4 (c) 0.6 (d) 0.8

Q.18
What are the number of moles of oxygen in 11g of CO2?

(a) 0.25 (b) 0.50 (c) 0.75 (d) 1.0

Q.19 One mole of water contains:

(a) 81g water (b) 6.6.02 x 10^23 atoms (c) 6.6.02 x 10^23 ions (d) 6.6.02 x 10^23 molecules

Q.20
6g of hydrogen gas is:

(a) 1 mole (b) 2 moles (c) 3 moles (d) 4 moles

Q.21
The sum of atomic masses of all the elements present in a molecule is called:

(a) Atomic mass (b) Ionic mass (c) Molecular mass (d) Empirical formula mass

Q.22
The mass of 0.5 mole of Al is:

(a) 12g (b) 13.5g (c) 14g (d) 2.7g

Q.23 The number of moles of CH4 in 4g of gas is:

(a) 0.2 mole (b) 0.25 mole (c) 0.3 mole (d) 0.4 mole

Q.24
Which of the following has maximum mass?

(a) 2 moles of P (b) 5 moles of H2O (c) 2 moles of Naz CO3 (d) 1 mole of glucose

Q.25
1 Mole of OH! ion is equal to:

(a) 18g (b) 16g (c) 17g (d) 10g

Q.26
Mass of 2 moles of CO2 is:

(a) 44g (b) 88g (c) 40g (d) 50g

Q.28
The largest number of molecules are present in:

(a) 3.6 g of H2O (b) 4.6 g of CHsOH (c) 2.8 g of CO (d) 5.4 g of N20s

Q.29 One mole of SO contains:

(a) 6.6.02 × 10^23 atoms of oxygen (b) 18.1 x 1023 molecules of SO2 (c) 6.022 x 1023 atoms of sulphur (d) 4g atoms of SO2

Q.30
A ring has 6g of diamond in it. What is the number of atoms in it?

(a) 6.6.02 × 10^23 (b) 12.04 x 1023 (c) 1.003 x 1023 (d) 3.01 x 1023

Q.31
The number of H2O molecules in 9 grams of ice is:

(a) 3.01 × 1023 (b) 6.6.02 × 10^23 (c) 6.02 × 10° (d) 12.12.04 × 10^23

Q.32
32g of oxygen gas contains:

(a) 6.6.02 × 10^23 molecules (b) 6.6.02 x 10^23 atoms (c) 12.12.04 × 10^23 molecules (d) 24.04 x 1023 atoms

Q.32
6.02 - × 1023 • x 1023

(a) (b)

Q.33
How many atoms are present in one mole of water?

(a) 3 (b) 54 (c) 6.02 × 1043 (d) 3(6.6.02 x 10^23)

Q.34
The number of molecules in 8g of oxygen gas is:

(a) 6.02 × 10-3 (b) 3.01 × 1023 (c) 1.50 × 1023 (d) 0.75 × 1023

Q.35
The number of atoms present in 6g of Mg metal is:

(a) 6.6.02 × 10^23 (b) 3.01 × 1023 (c) 12.12.04 × 10^23 (d) 1.5 x 1023

Q.36
The total number of oxygen atoms in 22g of CO2 gas is:

(a) 6:6.02 × 10^23 (b) 3.01 x 1023 (c) 12.04 x 1023 (d) 3.0 x 1023

Q.37
The mass of 1.505 x 1023 atoms of S:

(a) 0.5g (b) 0.6g (c) 0.7g (d) 8g

Q.39
How many atoms are present in half mole of oxygen gas?

(a) 3.01 × 1023 (b) 6.02,3 x 1023 (c) 2 × 1023 ions in AlCh is (d) 1.003 x 1023

Q.41
Which of the following has minimum mass?

(a) 1 mole of S (b) 79 grams of Ag (c) 2 gram atoms of N (d) 3 x 1023 atoms of C

Q.42
How many carbon atoms are present in 90g glucose?

(a) 6.6.02 × 10^23 (b) 1.8 x 1023 (c) 1.8 × 1022 (d) 1.8 x 1024

Q.44
The volume occupied by 1.4g of N2 at STP is:

(a) 22.4 dm (b) 2.24 dm (c) 1.12 dm (d) 112 dm'

Q.45 Molar volume of a gas at STP is equal to:

(a) 1 gram of a gas (b) 6.6.02 x 10^23 g of a gas (c) 22.414 dm (d) 1 gram ion of gas

Q.46
4g of CH4 at STP has molecules.

(a) 6.6.02 x 10^23 (b) 3.01 x 1023 (c) 12.1 x 1023 (d) 1.5 x 10-

Q.48
Number of molecules in 1 dm of steam at STP is:

(a) 55.5 × 6.6.02 × 10^23 (b) 1000 × 6.6.02 × 10^23 (c) 18 × 6:6.02 x 10^23 (d) 0.268 x 1023 Stoichiometric Relationships

Q.49
27g of Al will react completely with how much mass of Or to produce AL2Oз?

(a) 8g (b) 16g (c) 32g (d) 24g

Q.50
The ratio of number of molecules in 71g of gaseous chlorine to the number of molecules in 2g of gaseous hydrogen

(a) 71:1 (b) 71:2 (c) 1:2 (d) 1:1

Q.51
The equation of burning of hydrogen in oxygen is: 2H2(g) + 02(g) → 2H20 (g) Which one is a correct description of this reaction?

(a) 2 atoms of hydrogen combine with 2 atoms of oxygen (b) 2 moles of steam can be produced from 0.5 mole of oxygen (c) 2 moles of steam can be produced from 1 mole of oxygen (d) 2g of hydrogen combine with 1 g of oxygen

Q.52
The ratio of number of molecules of 2g H2 gas to number of molecules of 64g gaseous oxygen is:

(a) 1: 1 (b) 1:2 (c) 1: 32 (d) 1: 4

Q.53
What is the ratio of volumes of 2g of H2 to the volume of 16g CH4 both volumes are at STP?

(a) 1: 8 (b) 1: 2 (c) 1: 1 (d) 2: 1

Q.54
A mixture of 8g of H2 with 8g of Oz is 2H2 + 02 → 2H20 ignited What is the mass of water formed?

(a) 9g (b) 16g (c) 30g (d) 72g

Q.55
What is the maximum mass of chromium, that can be extracted from 76g of Cr2O3? (relative atomic mass of Cr=52;0=16)

(a) 48g (b) 52g (c) 104g (d) 152g

Q.56
What is the mass of oxygen obtained from 72g of pure water?

(a) 16g (b) 32g (c) 64g Limiting and Excess Reactant (d) 70g

Q.57 A limiting reactant is the one which:

(a) is taken in lesser quantity in grams as compared to other reactants (b) is taken in lesser quantity in volume as compared to the other reactants (c) gives the maximum amount of the product which is required (d) gives the minimum amount of the product under consideration

Q.58
The reactant which consumes earlier and gives least quantity of product is called:

(a) Reactant (b) Limiting reactant (c) Stochiometry (d) Stochiometric amount water are

Q.59
How many moles of produced by burning 4 moles of H2 with excess of oxygen?

(a) 1 mole (b) 2 moles (c) . 3 moles ANSWER KEY b (d) 4 moles

Q.60
If 16 grams of Oz react with excess CHo, how many grams of CO2 will be formed? 2C, H, +70, - → 4C0, + 6H2O

(a) 22g (b) 13g (c) 9g b a a (d) 7g

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Chapter 04: Stoichiometry

Exam Mode Rules

Q.1 Which one of the following statements is incorrect?

Q.2 6.02 × 10^23. The number of CF ions are:

Q.4 Which of the following contains same number of particles as present in 12g of carbon?

Q.5 Volume at S.T.P of 22g of CO2 is same as that of:

Q.6 4.0g of NaOH (molar mass 40g mol) contains same number of sodium ions as are present in:

Stoichiometry

Q.7 A container holds 0.5 moles of an ideal gas at STP. What is the volume of the gas in dm?

Q.8 A solution contains 4.0g of sodium hydroxide (NaOH, molar mass = 40.0g mol-1) in 250 cm3? of solution. What is the molar concentration of this solution?

Q.9 A solution contains 10.0g of an unknown solute in 250 cm of solution. If the molar concentration of the solution is 0.20 mol dm3 , What is the molar mass of the solute?

Q.10 A sample of nitrogen gas (N2, molar mass = 28.0g mol) has a mass of 14.0g. How many nitrogen atoms are present in this sample?

Q.11 A gas has a density of 1.43g dm3 at STP. What is the molar mass of the gas? (Molar volume at STP = 22.4 dm mol-1)

Q.12 A gas has a density of 1.96g dm3 at STP (0°C and 1.00 atm). What is its molecular mass? (Molar volume at STP = 22.4 dm mol-1)

Q.12 12.04 × 10^23 molecules of CO?

Q.13 The mass of one mole of electron is:

Q.14 The number of moles of CO2 which contain 8g of oxygen:

Q.15 One mole of carbon-12 has mass:

Q.16 The mass of one mole of chlorine gas is:

Q.17 What are the number of moles of of CHa? hydrogen atom in 3.2g (Relative atomic mass of C = 12)

Q.18 What are the number of moles of oxygen in 11g of CO2?

Q.19 One mole of water contains:

Q.20 6g of hydrogen gas is:

Q.21 The sum of atomic masses of all the elements present in a molecule is called:

Q.22 The mass of 0.5 mole of Al is:

Q.23 The number of moles of CH4 in 4g of gas is:

Q.24 Which of the following has maximum mass?

Q.25 1 Mole of OH! ion is equal to:

Q.26 Mass of 2 moles of CO2 is:

Q.28 The largest number of molecules are present in:

Q.29 One mole of SO contains:

Q.30 A ring has 6g of diamond in it. What is the number of atoms in it?

Q.31 The number of H2O molecules in 9 grams of ice is:

Q.32 32g of oxygen gas contains:

Q.32 6.02 - × 1023 • x 1023

Q.33 How many atoms are present in one mole of water?

Q.34 The number of molecules in 8g of oxygen gas is:

Q.35 The number of atoms present in 6g of Mg metal is:

Q.36 The total number of oxygen atoms in 22g of CO2 gas is:

Q.37 The mass of 1.505 x 1023 atoms of S:

Q.39 How many atoms are present in half mole of oxygen gas?

Q.41 Which of the following has minimum mass?

Q.42 How many carbon atoms are present in 90g glucose?

Q.44 The volume occupied by 1.4g of N2 at STP is: