# Balbharati solutions for Chemistry 11th Standard Maharashtra State Board chapter 2 - Introduction to Analytical Chemistry [Latest edition]

## Chapter 2: Introduction to Analytical Chemistry

Exercises
Exercises [Pages 23 - 25]

### Balbharati solutions for Chemistry 11th Standard Maharashtra State Board Chapter 2 Introduction to Analytical Chemistry Exercises [Pages 23 - 25]

Exercises | Q 1. (A) | Page 23

Choose the correct option:

The branch of chemistry which deals with study of separation, identification, and quantitative determination of the composition of different substances is called as __________

• Physical chemistry

• Inorganic chemistry

• Organic chemistry

• Analytical chemistry

Exercises | Q 1. (B) | Page 23

Choose the correct option:

Which one of the following property of matter is Not quantitative in nature?

• Mass

• Length

• Colour

• Volume

Exercises | Q 1. (C) | Page 23

Choose the correct option:

SI unit of mass is _________

• kg

• mol

• pound

• m3

Exercises | Q 1. (D) | Page 23

Choose the correct option:

The number of significant figures in 1.50 × 104 g is __________

• 2

• 3

• 4

• 6

Exercises | Q 1. (E) | Page 23

Choose the correct option:

In Avogadro’s constant 6.022 × 1023 mol-1, the number of significant figures is ________

• 3

• 4

• 5

• 6

Exercises | Q 1. (F) | Page 23

Choose the correct option:

By decomposition of 25 g of CaCO3, the amount of CaO produced will be ________

• 2.8 g

• 8.4 g

• 14.0 g

• 28.0 g

Exercises | Q 1. (G) | Page 23

Choose the correct option:

How many grams of water will be produced by complete combustion of 12 g of methane gas

• 16

• 27

• 36

• 56

Exercises | Q 1. (H) | Page 23

Choose the correct option:

Two elements A (At. mass 75) and B (At. mass 16) combine to give a compound having 75.8 % of A. The formula of the compound is

• AB

• A2B

• AB2

• A2B3

Exercises | Q 1. (I) | Page 23

Choose the correct option:

The hydrocarbon contains 79.87% carbon and 20.13% of hydrogen. What is its empirical formula?

• CH

• CH2

• CH3

• C2H5

Exercises | Q 1. (J) | Page 23

Choose the correct option:

How many grams of oxygen will be required to react completely with 27 g of Al? (Atomic mass: Al = 27, O = 16)

• 8

• 16

• 24

• 32

Exercises | Q 1. (K) | Page 23

Choose the correct option:

In CuSO4.5H2O the percentage of water is ______
(Cu = 63.5, S = 32, O = 16, H = 1)

• 10%

• 36%

• 60%

• 72%

Exercises | Q 1. (L) | Page 23

Choose the correct option:

When two properties of a system are mathematically related to each other, the relation can be deduced by

• Working out mean deviation

• Plotting a graph

• Calculating relative error

• all the above three

Exercises | Q 2. (A) | Page 23

Define: Least count

Exercises | Q 2. (B) | Page 23

What do you mean by significant figures?

Exercises | Q 2. (B) | Page 23

State the rules for deciding significant figures.

Exercises | Q 2. (C) | Page 23

Distinguish between accuracy and precision.

Exercises | Q 2. (D) | Page 23

Explain the term percentage composition.

Exercises | Q 2. (D) | Page 23

Explain the term empirical formula.

Exercises | Q 2. (D) | Page 23

Explain the term molecular formula.

Exercises | Q 2. (E) | Page 23

What is a limiting reagent? Explain.

Exercises | Q 2. (F) | Page 23

What do you mean by SI units?

Exercises | Q 2. (F) | Page 23

What is the SI unit of mass?

Exercises | Q 2. (G)(a) | Page 23

Explain the term mole fraction

Exercises | Q 2. (G)(b) | Page 23

Explain the term molarity

Exercises | Q 2. (G)(c) | Page 23

Explain the term molality

Exercises | Q 2. (H) | Page 23

Define: Stoichiometry

Exercises | Q 2. (I) | Page 23

Why there is a need of rounding off figures during calculation?

Exercises | Q 2. (J) | Page 23

Why does the molarity of a solution depend upon temperature?

Exercises | Q 2. (M) | Page 24

Define Analytical chemistry.

Exercises | Q 2. (M) | Page 24

Why is accurate measurement crucial in science?

Exercises | Q 3. (A)(a) | Page 24

Solve the following question:

How many significant figure is in the following quantity?

45.26 ft

Exercises | Q 3. (A)(b) | Page 24

Solve the following question:

How many significant figure is in the following quantity?

0.109 in

Exercises | Q 3. (A)(c) | Page 24

Solve the following question:

How many significant figure is in the following quantity?

0.00025 kg

Exercises | Q 3. (A)(d) | Page 24

Solve the following question:

How many significant figure is in the following quantity?

2.3659 × 10-8 cm

Exercises | Q 3. (A)(e) | Page 24

Solve the following question:

How many significant figure is in the following quantity?

52.0 cm3

Exercises | Q 3. (A)(f) | Page 24

Solve the following question:

How many significant figure is in the following quantity?

0.00020 kg

Exercises | Q 3. (A)(g) | Page 24

Solve the following question:

How many significant figure is in the following quantity?

8.50 × 104 mm

Exercises | Q 3. (A)(h) | Page 24

Solve the following question:

How many significant figure is in the following quantity?

300.0 cg

Exercises | Q 3. (B)(a) | Page 24

Solve the following question:

Round off the following quantity to two significant figures:

25.55 mL

Exercises | Q 3. (B)(b) | Page 24

Solve the following question:

Round off the following quantity to two significant figures:

0.00254 m

Exercises | Q 3. (B)(c) | Page 24

Solve the following question:

Round off the following quantity to two significant figures:

1.491 × 105 mg

Exercises | Q 3. (B)(d) | Page 24

Solve the following question:

Round off the following quantity to two significant figures:

199 g

Exercises | Q 3. (C)(a) | Page 24

Solve the following question:

Round off the following quantity to three significant figures:

1.43 cm3

Exercises | Q 3. (C)(b) | Page 24

Solve the following question:

Round off the following quantity to three significant figures:

458 × 102 cm

Exercises | Q 3. (C)(c) | Page 24

Solve the following question:

Round off the following quantity to three significant figures:

643 cm2

Exercises | Q 3. (C)(d) | Page 24

Solve the following question:

Round off the following quantity to three significant figures:

0.039 m

Exercises | Q 3. (C)(e) | Page 24

Solve the following question:

Round off the following quantity to three significant figures:

6.398 × 10-3 km

Exercises | Q 3. (C)(f) | Page 24

Solve the following question:

Round off the following quantity to three significant figures:

0.0179 g

Exercises | Q 3. (C)(g) | Page 24

Solve the following question:

Round off the following quantity to three significant figures:

79,000 m

Exercises | Q 3. (C)(h) | Page 24

Solve the following question:

Round off the following quantity to three significant figures:

42,150

Exercises | Q 3. (C)(i) | Page 24

Solve the following question:

Round off the following quantity to three significant figures:

649.85

Exercises | Q 3. (C)(j) | Page 24

Solve the following question:

Round off the following quantity to three significant figures:

23,642,000 mm

Exercises | Q 3. (C)(k) | Page 24

Solve the following question:

Round off the following quantity to three significant figures:

0.0041962 kg

Exercises | Q 3. (D)(a) | Page 24

Solve the following question:

Express the following sum to the appropriate number of significant figures:

2.3 × 103 mL + 4.22 × 104 mL + 9.04 × 103 mL + 8.71 × 105 mL

Exercises | Q 3. (D)(b) | Page 24

Solve the following question:

Express the following sum to the appropriate number of significant figures:

319.5 g − 20460 g − 0.0639 g − 45.642 g − 4.173 g

Exercises | Q 4. (A)(a) | Page 24

Solve the following problem:

Express the following quantity in exponential terms.

0.0003498

Exercises | Q 4. (A)(b) | Page 24

Solve the following problem:

Express the following quantity in exponential terms.

235.4678

Exercises | Q 4. (A)(c) | Page 24

Solve the following problem:

Express the following quantity in exponential terms.

70000.0

Exercises | Q 4. (A)(d) | Page 24

Solve the following problem:

Express the following quantity in exponential terms.

1569.00

Exercises | Q 4. (B)(a) | Page 24

Solve the following problem:

Give the number of significant figures for the following.

1.230 × 104

Exercises | Q 4. (B)(b) | Page 24

Solve the following problem:

Give the number of significant figures for the following.

0.002030

Exercises | Q 4. (B)(c) | Page 24

Solve the following problem:

Give the number of significant figures for the following.

1.23 × 104

Exercises | Q 4. (B)(d) | Page 24

Solve the following problem:

Give the number of significant figures for the following.

1.89 × 10-4

Exercises | Q 4. (C)(a) | Page 24

Solve the following problem:

Express the given quantity with or without exponents as the case may be.

1.230 × 104

Exercises | Q 4. (C)(b) | Page 24

Solve the following problem:

Express the given quantity with or without exponents as the case may be.

0.002030

Exercises | Q 4. (C)(c) | Page 24

Solve the following problem:

Express the given quantity with or without exponents as the case may be.

1.23 × 104

Exercises | Q 4. (C)(d) | Page 24

Solve the following problem:

Express the given quantity with or without exponents as the case may be.

1.89 × 10-4

Exercises | Q 4. (D)(a) | Page 24

Solve the following problem:

Find out the molar mass of the following compounds:

Copper sulphate crystal (CuSO4.5H2O)

(At. mass: Cu = 63.5; S = 32; O = 16; H = 1; Na = 23; C = 12; Fe = 56; N = 14)

Exercises | Q 4. (D)(b) | Page 24

Solve the following problem:

Find out the molar mass of the following compounds:

Sodium carbonate, decahydrate (Na2CO3.10H2O)

(At. mass: Cu = 63.5; S = 32; O = 16; H = 1; Na = 23; C = 12; Fe = 56; N = 14)

Exercises | Q 4. (D)(c) | Page 24

Solve the following problem:

Find out the molar mass of the following compounds:

Mohr’s salt [FeSO4(NH4)2SO4.6H2O]

(At. mass: Cu = 63.5; S = 32; O = 16; H = 1; Na = 23; C = 12; Fe = 56; N = 14)

Exercises | Q 4. (E)(a) | Page 24

Solve the following problem:

Work out the percentage composition of constituent elements in the following compound:

(At. mass: Pb = 207; P = 31; O = 16; K = 39; Cr = 52; Na = 23; N = 14)

Exercises | Q 4. (E)(b) | Page 24

Solve the following problem:

Work out the percentage composition of constituent elements in the following compound:

Potassium dichromate (K2Cr2O7)

(At. mass: Pb = 207; P = 31; O = 16; K = 39; Cr = 52; Na = 23; N = 14)

Exercises | Q 4. (E)(c) | Page 24

Solve the following problem:

Work out the percentage composition of constituent elements in the following compound:

Macrocosmic salt - Sodium ammonium hydrogen phosphate, tetrahydrate (NaNH4HPO4.4H2O)

(At. mass: Pb = 207; P = 31; O = 16; K = 39; Cr = 52; Na = 23; N = 14)

Exercises | Q 4. (F) | Page 24

Solve the following problem:

Find the percentage composition of constituent green vitriol crystals (FeSO4.7H2O). Also, find out the mass of iron and the water of crystallisation in 4.54 kg of the crystals. (At. mass : Fe = 56; S = 32; O = 16)

Exercises | Q 4. (G) | Page 24

Solve the following problem:

The red colour of blood is due to a compound called “haemoglobin”. It contains 0.335% of iron. Four atoms of iron are present in one molecule of haemoglobin. What is its molecular weight? (At. mass: Fe = 55.84)

Exercises | Q 4. (H) | Page 24

Solve the following problem:

A substance, on analysis, gave the following percent composition: Na = 43.4%, C = 11.3% and O = 45.3%. Calculate the empirical formula. (At. mass Na = 23 u, C = 12 u, O = 16 u).

Exercises | Q 4. (I) | Page 24

Solve the following problem:

Assuming the atomic weight of a metal M to be 56, find the empirical formula of its oxide containing 70.0% of M.

Exercises | Q 4. (J) | Page 25

Solve the following problem:

1.00 g of a hydrated salt contains 0.2014 g of iron, 0.1153 g of sulfur, 0.2301 g of oxygen, and 0.4532 g of water of crystallisation. Find the empirical formula. (At. wt.: Fe = 56; S = 32; O = 16)

Exercises | Q 4. (K) | Page 25

Solve the following problem:

An organic compound containing oxygen, carbon, hydrogen, and nitrogen contains 20% carbon, 6.7% hydrogen, and 46.67% nitrogen. Its molecular mass was found to be 60. Find the molecular formula of the compound.

Exercises | Q 4. (L) | Page 25

Solve the following problem:

A compound on analysis gave the following percentage composition by mass: H = 9.09; O = 36.36; C = 54.55. Mol mass of compound is 88 g mol−1. Find its molecular formula.

Exercises | Q 4. (M) | Page 25

Solve the following problem:

Carbohydrates are compounds containing only carbon, hydrogen, and oxygen. When heated in the absence of air, these compounds decompose to form carbon and water. If 310 g of a carbohydrate leaves a residue of 124 g of carbon on heating in absence of air, what is the empirical formula of the carbohydrate?

Exercises | Q 4. (N)(a) | Page 25

Solve the following problem:

Write the following in exponential notation:

3,672,199

Exercises | Q 4. (N)(b) | Page 25

Solve the following problem:

Write the following in exponential notation:

0.000098

Exercises | Q 4. (N)(c) | Page 25

Solve the following problem:

Write the following in exponential notation:

0.00461

Exercises | Q 4. (N)(d) | Page 25

Solve the following problem:

Write the following in exponential notation:

198.75

Exercises | Q 4. (O)(a) | Page 25

Solve the following problem:

Write the following number in ordinary decimal form:

3.49 × 10−11

Exercises | Q 4. (O)(b) | Page 25

Solve the following problem:

Write the following number in ordinary decimal form:

3.75 × 10−1

Exercises | Q 4. (O)(c) | Page 25

Solve the following problem:

Write the following number in ordinary decimal form:

5.16 × 104

Exercises | Q 4. (O)(d) | Page 25

Solve the following problem:

Write the following number in ordinary decimal form:

43.71 × 10−4

Exercises | Q 4. (O)(e) | Page 25

Solve the following problem:

Write the following number in ordinary decimal form:

0.011 × 10−3

Exercises | Q 4. (O)(f) | Page 25

Solve the following problem:

Write the following number in ordinary decimal form:

14.3 × 10−2

Exercises | Q 4. (O)(g) | Page 25

Solve the following problem:

Write the following number in ordinary decimal form:

0.00477 × 105

Exercises | Q 4. (O)(h) | Page 25

Solve the following problem:

Write the following number in ordinary decimal form:

5.00858585

Exercises | Q 4. (P)(a) | Page 25

Solve the following problem:

1/(3.40xx10^24)

Exercises | Q 4. (P)(b) | Page 25

Solve the following problem:

33/(9.00xx10^-4)

Exercises | Q 4. (P)(c) | Page 25

Solve the following problem:

(1.4xx10^9)/((2.77xx10^3)(3.76xx10^5))

Exercises | Q 4. (P)(d) | Page 25

Solve the following problem:

((4xx10^-3)(9.9xx10^-7))/((789)(1.002xx10^-10)(0.3xx10^2))

Exercises | Q 4. (Q)(a) | Page 25

Solve the following problem:

(3.26 × 104) × (1.54 × 106)

Exercises | Q 4. (Q)(b) | Page 25

Solve the following problem:

(8.39 × 107) × (4.53 × 109)

Exercises | Q 4. (Q)(c) | Page 25

Solve the following problem:

(8.94xx10^6)/(4.35xx10^4)

Exercises | Q 4. (Q)(d) | Page 25

Solve the following problem:

((9.28xx10^9)(9.9xx10^-7))/((511)(2.98xx10^-6))

Exercises | Q 4. (R)(a) | Page 25

Solve the following problem:

Perform the following operation:

3.971 × 107 + 1.98 × 104

Exercises | Q 4. (R)(b) | Page 25

Solve the following problem:

Perform the following operation:

1.05 × 10−4 − 9.7 × 10−5

Exercises | Q 4. (R)(c) | Page 25

Solve the following problem:

Perform the following operation:

4.11 × 10−3 + 8.1 ×10−4

Exercises | Q 4. (R)(d) | Page 25

Solve the following problem:

Perform the following operation:

2.12 × 106 − 3.5 × 105

Exercises | Q 4. (S) | Page 25

Solve the following problem:

A 1.000 mL sample of acetone, a common solvent used as a paint remover, was placed in a small bottle whose mass was known to be 38.0015 g.
The following values were obtained when the acetone - filled bottle was weighed : 38.7798 g, 38.7795 g and 38.7801 g. How would you characterise the precision and accuracy of these measurements if the actual mass of the acetone was 0.7791 g?

Exercises | Q 4. (T)(a) | Page 25

Solve the following problem:

Your laboratory partner was given the task of measuring the length of a box (approx 5 in) as accurately as possible, using a metre stick graduated in milimeters. He supplied you with the following measurements:

12.65 cm, 12.6 cm, 12.65 cm, 12.655 cm, 126.55 mm, 12 cm.

State which of the measurements you would accept, giving the reason.

Exercises | Q 4. (T)(b) | Page 25

Solve the following problem:

Your laboratory partner was given the task of measuring the length of a box (approx 5 in) as accurately as possible, using a metre stick graduated in milimeters. He supplied you with the following measurements:

12.65 cm, 12.6 cm, 12.65 cm, 12.655 cm, 126.55 mm, 12 cm.

Give your reason for rejecting each of the others.

Exercises | Q 4. (U) | Page 25

Solve the following problem:

What weight of calcium oxide will be formed on heating 19.3 g of calcium carbonate?
(At. wt.: Ca = 40; C = 12; O = 16)

Exercises | Q 4. (V) | Page 25

Solve the following problem:

The hourly energy requirements of an astronaut can be satisfied by the energy released when 34 grams of sucrose are “burnt” in his body. How many grams of oxygen would be needed to be carried in space capsule to meet his requirement for one day?

Exercises

## Balbharati solutions for Chemistry 11th Standard Maharashtra State Board chapter 2 - Introduction to Analytical Chemistry

Balbharati solutions for Chemistry 11th Standard Maharashtra State Board chapter 2 (Introduction to Analytical Chemistry) include all questions with solution and detail explanation. This will clear students doubts about any question and improve application skills while preparing for board exams. The detailed, step-by-step solutions will help you understand the concepts better and clear your confusions, if any. Shaalaa.com has the Maharashtra State Board Chemistry 11th Standard Maharashtra State Board solutions in a manner that help students grasp basic concepts better and faster.

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Concepts covered in Chemistry 11th Standard Maharashtra State Board chapter 2 Introduction to Analytical Chemistry are Introduction of Analytical Chemistry, Analysis, Mathematical Operation and Error Analysis, Determination of Molecular Formula, Chemical Reactions and Stoichiometric Calculations, Limiting Reagent, Use of Graph in Analysis, Concentration of a Solution.

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