#### Chapters

Chapter 2: Introduction to Analytical Chemistry

Chapter 3: Basic Analytical Techniques

Chapter 4: Structure of Atom

Chapter 5: Chemical Bonding

Chapter 6: Redox Reactions

Chapter 7: Modern Periodic Table

Chapter 8: Elements of Group 1 and 2

Chapter 9: Elements of Group 13, 14 and 15

Chapter 10: States of Matter

Chapter 11: Adsorption and Colloids

Chapter 12: Chemical Equilibrium

Chapter 13: Nuclear Chemistry and Radioactivity

Chapter 14: Basic Principles of Organic Chemistry

Chapter 15: Hydrocarbons

Chapter 16: Chemistry in Everyday Life

## Chapter 2: Introduction to Analytical Chemistry

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

**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

**Choose the correct option:**

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

Mass

Length

Colour

Volume

**Choose the correct option:**

SI unit of mass is _________

kg

mol

pound

m

^{3}

**Choose the correct option:**

The number of significant figures in 1.50 × 10^{4} g is __________

2

3

4

6

**Choose the correct option:**

In Avogadro’s constant 6.022 × 10^{23} mol^{-1}, the number of significant figures is ________

3

4

5

6

**Choose the correct option:**

By decomposition of 25 g of CaCO_{3}, the amount of CaO produced will be ________

2.8 g

8.4 g

14.0 g

28.0 g

**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

**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

A

_{2}BAB

_{2}A

_{2}B_{3}

**Choose the correct option:**

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

CH

CH

_{2}CH

_{3}C

_{2}H_{5}

**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

**Choose the correct option:**

In CuSO_{4}.5H_{2}O the percentage of water is ______

(Cu = 63.5, S = 32, O = 16, H = 1)

10%

36%

60%

72%

**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

**Define:** Least count

What do you mean by significant figures?

State the rules for deciding significant figures.

Distinguish between accuracy and precision.

Explain the term percentage composition.

Explain the term empirical formula.

Explain the term molecular formula.

What is a limiting reagent? Explain.

What do you mean by SI units?

What is the SI unit of mass?

Explain the term mole fraction

Explain the term molarity

Explain the term molality

**Define:** Stoichiometry

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

Why does the molarity of a solution depend upon temperature?

Define Analytical chemistry.

Why is accurate measurement crucial in science?

**Solve the following question:**

How many significant figure is in the following quantity?

45.26 ft

**Solve the following question:**

How many significant figure is in the following quantity?

0.109 in

**Solve the following question:**

How many significant figure is in the following quantity?

0.00025 kg

**Solve the following question:**

How many significant figure is in the following quantity?

2.3659 × 10^{-8} cm

**Solve the following question:**

How many significant figure is in the following quantity?

52.0 cm^{3}

**Solve the following question:**

How many significant figure is in the following quantity?

0.00020 kg

**Solve the following question:**

How many significant figure is in the following quantity?

8.50 × 10^{4} mm

**Solve the following question:**

How many significant figure is in the following quantity?

300.0 cg

**Solve the following question:**

Round off the following quantity to two significant figures:

25.55 mL

**Solve the following question:**

Round off the following quantity to two significant figures:

0.00254 m

**Solve the following question:**

Round off the following quantity to two significant figures:

1.491 × 10^{5} mg

**Solve the following question:**

Round off the following quantity to two significant figures:

199 g

**Solve the following question:**

Round off the following quantity to three significant figures:

1.43 cm^{3}

**Solve the following question:**

Round off the following quantity to three significant figures:

458 × 10^{2} cm

**Solve the following question:**

Round off the following quantity to three significant figures:

643 cm^{2}

**Solve the following question:**

Round off the following quantity to three significant figures:

0.039 m

**Solve the following question:**

Round off the following quantity to three significant figures:

6.398 × 10^{-3} km

**Solve the following question:**

Round off the following quantity to three significant figures:

0.0179 g

**Solve the following question:**

Round off the following quantity to three significant figures:

79,000 m

**Solve the following question:**

Round off the following quantity to three significant figures:

42,150

**Solve the following question:**

Round off the following quantity to three significant figures:

649.85

**Solve the following question:**

Round off the following quantity to three significant figures:

23,642,000 mm

**Solve the following question:**

Round off the following quantity to three significant figures:

0.0041962 kg

**Solve the following question:**

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

2.3 × 10^{3} mL + 4.22 × 10^{4 }mL + 9.04 × 10^{3} mL + 8.71 × 10^{5} mL

**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

**Solve the following problem:**

Express the following quantity in exponential terms.

0.0003498

**Solve the following problem:**

Express the following quantity in exponential terms.

235.4678

**Solve the following problem:**

Express the following quantity in exponential terms.

70000.0

**Solve the following problem:**

Express the following quantity in exponential terms.

1569.00

**Solve the following problem:**

Give the number of significant figures for the following.

1.230 × 10^{4}

**Solve the following problem:**

Give the number of significant figures for the following.

0.002030

**Solve the following problem:**

Give the number of significant figures for the following.

1.23 × 10^{4}

**Solve the following problem:**

Give the number of significant figures for the following.

1.89 × 10^{-4}

**Solve the following problem:**

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

1.230 × 10^{4}

**Solve the following problem:**

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

0.002030

**Solve the following problem:**

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

1.23 × 10^{4}

**Solve the following problem:**

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

1.89 × 10^{-4}

**Solve the following problem:**

Find out the molar mass of the following compounds:

Copper sulphate crystal (CuSO_{4}.5H_{2}O)

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

**Solve the following problem:**

Find out the molar mass of the following compounds:

Sodium carbonate, decahydrate (Na_{2}CO_{3}.10H_{2}O)

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

**Solve the following problem:**

Find out the molar mass of the following compounds:

Mohr’s salt [FeSO_{4}(NH_{4})_{2}SO_{4}.6H_{2}O]

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

**Solve the following problem:**

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

Lead phosphate [Pb_{3}(PO_{4})_{2}]

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

**Solve the following problem:**

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

Potassium dichromate (K_{2}Cr_{2}O_{7})

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

**Solve the following problem:**

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

Macrocosmic salt - Sodium ammonium hydrogen phosphate, tetrahydrate (NaNH_{4}HPO_{4}.4H_{2}O)

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

**Solve the following problem:**

Find the percentage composition of constituent green vitriol crystals (FeSO_{4}.7H_{2}O). 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)

**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)

**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).

**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.

**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)

**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.

**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.

**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?

**Solve the following problem:**

Write the following in exponential notation:

3,672,199

**Solve the following problem:**

Write the following in exponential notation:

0.000098

**Solve the following problem:**

Write the following in exponential notation:

0.00461

**Solve the following problem:**

Write the following in exponential notation:

198.75

**Solve the following problem:**

Write the following number in ordinary decimal form:

3.49 × 10^{−11}

**Solve the following problem:**

Write the following number in ordinary decimal form:

3.75 × 10^{−1}

**Solve the following problem:**

Write the following number in ordinary decimal form:

5.16 × 10^{4}

**Solve the following problem:**

Write the following number in ordinary decimal form:

43.71 × 10^{−4}

**Solve the following problem:**

Write the following number in ordinary decimal form:

0.011 × 10^{−3}

**Solve the following problem:**

Write the following number in ordinary decimal form:

14.3 × 10^{−2}

**Solve the following problem:**

Write the following number in ordinary decimal form:

0.00477 × 10^{5}

**Solve the following problem:**

Write the following number in ordinary decimal form:

5.00858585

**Solve the following problem:**

Perform the following calculation. Round off your answer to two digits.

`1/(3.40xx10^24)`

**Solve the following problem:**

Perform the following calculation. Round off your answer to two digits.

`33/(9.00xx10^-4)`

**Solve the following problem:**

Perform the following calculation. Round off your answer to two digits.

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

**Solve the following problem:**

Perform the following calculation. Round off your answer to two digits.

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

**Solve the following problem:**

Perform the following calculation. Round off your answer to three digits.

(3.26 × 10^{4}) × (1.54 × 10^{6})

**Solve the following problem:**

Perform the following calculation. Round off your answer to three digits.

(8.39 × 10^{7}) × (4.53 × 10^{9})

**Solve the following problem:**

Perform the following calculation. Round off your answer to three digits.

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

**Solve the following problem:**

Perform the following calculation. Round off your answer to three digits.

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

**Solve the following problem:**

Perform the following operation:

3.971 × 10^{7 }+ 1.98 × 10^{4}

**Solve the following problem:**

Perform the following operation:

1.05 × 10^{−4} − 9.7 × 10^{−5}

**Solve the following problem:**

Perform the following operation:

4.11 × 10^{−3} + 8.1 ×10^{−4}

**Solve the following problem:**

Perform the following operation:

2.12 × 10^{6} − 3.5 × 10^{5}

**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?

**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.

**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.

**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)

**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?

## Chapter 2: Introduction to Analytical Chemistry

## 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.

Using Balbharati 11th solutions Introduction to Analytical Chemistry exercise by students are an easy way to prepare for the exams, as they involve solutions arranged chapter-wise also page wise. The questions involved in Balbharati Solutions are important questions that can be asked in the final exam. Maximum students of Maharashtra State Board 11th prefer Balbharati Textbook Solutions to score more in exam.

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