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CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307081 Which of the following is correct?
(i) $\frac{5.28 \times 0.156 \times 3}{0.0428} = 57.7$
(ii) $\frac{5.28 \times 0.156 \times 3}{0.0421} = 58.7$
(iii) $\frac{42.967 \times 0.02435}{0.34 \times 4} = 0.77$

1 (i) and (ii)

2 (i), (ii) and (iii)

3 (i) and (iii)

4 (ii) and (iii)

CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307082 Given the numbers: 161cm, 0.161 cm, 0.0161cm. The number of significant figures for the three numbers are

1 3, 4 and 5 respectively

2 3, 3 and 3 respectively

3 3, 3 and 4 respectively

4 3, 4 and 4 respectively

CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307083 The number of significant figures in value of $π$ are

1 1

2 2

3 3

4

\infty

Explanation:

$π$ is an irrational number (note that $π \neq 22 / 7$ as $22 / 7$ is a rational number) and it means it has infinite number of significant figures.

CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307084 The correctly reported answer of the addition of $4.523, 2.3$ and 6.24 will have significant figures

1 two

2 three

3 four

4 five

Explanation:

$4.523 + 2.3 + 6.24 = 13.063$ . As 2.3 has least number of decimal places, i.e. one, therefore sum should be reported to one decimal place only. After rounding off, reported sum is 13.1 which has three significant figures.

CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307068 Find the value of $- 197^{\circ} C$ temperature in Kelvin.

1

47 K

2

76 K

3

470 K

4

760 K

Explanation:

Relation between $^{\circ} C$ and $K$ is
$K =^{\circ} C + 273.15 = - 197^{\circ} C + 273.15$
$= 76.15 K \approx 76 K$

MHTCET - 2021

CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307081 Which of the following is correct?
(i) $\frac{5.28 \times 0.156 \times 3}{0.0428} = 57.7$
(ii) $\frac{5.28 \times 0.156 \times 3}{0.0421} = 58.7$
(iii) $\frac{42.967 \times 0.02435}{0.34 \times 4} = 0.77$

1 (i) and (ii)

2 (i), (ii) and (iii)

3 (i) and (iii)

4 (ii) and (iii)

CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307082 Given the numbers: 161cm, 0.161 cm, 0.0161cm. The number of significant figures for the three numbers are

1 3, 4 and 5 respectively

2 3, 3 and 3 respectively

3 3, 3 and 4 respectively

4 3, 4 and 4 respectively

CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307083 The number of significant figures in value of $π$ are

1 1

2 2

3 3

4

\infty

Explanation:

$π$ is an irrational number (note that $π \neq 22 / 7$ as $22 / 7$ is a rational number) and it means it has infinite number of significant figures.

CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307084 The correctly reported answer of the addition of $4.523, 2.3$ and 6.24 will have significant figures

1 two

2 three

3 four

4 five

Explanation:

$4.523 + 2.3 + 6.24 = 13.063$ . As 2.3 has least number of decimal places, i.e. one, therefore sum should be reported to one decimal place only. After rounding off, reported sum is 13.1 which has three significant figures.

CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307068 Find the value of $- 197^{\circ} C$ temperature in Kelvin.

1

47 K

2

76 K

3

470 K

4

760 K

Explanation:

Relation between $^{\circ} C$ and $K$ is
$K =^{\circ} C + 273.15 = - 197^{\circ} C + 273.15$
$= 76.15 K \approx 76 K$

MHTCET - 2021

CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307081 Which of the following is correct?
(i) $\frac{5.28 \times 0.156 \times 3}{0.0428} = 57.7$
(ii) $\frac{5.28 \times 0.156 \times 3}{0.0421} = 58.7$
(iii) $\frac{42.967 \times 0.02435}{0.34 \times 4} = 0.77$

1 (i) and (ii)

2 (i), (ii) and (iii)

3 (i) and (iii)

4 (ii) and (iii)

CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307082 Given the numbers: 161cm, 0.161 cm, 0.0161cm. The number of significant figures for the three numbers are

1 3, 4 and 5 respectively

2 3, 3 and 3 respectively

3 3, 3 and 4 respectively

4 3, 4 and 4 respectively

CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307083 The number of significant figures in value of $π$ are

1 1

2 2

3 3

4

\infty

Explanation:

$π$ is an irrational number (note that $π \neq 22 / 7$ as $22 / 7$ is a rational number) and it means it has infinite number of significant figures.

CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307084 The correctly reported answer of the addition of $4.523, 2.3$ and 6.24 will have significant figures

1 two

2 three

3 four

4 five

Explanation:

$4.523 + 2.3 + 6.24 = 13.063$ . As 2.3 has least number of decimal places, i.e. one, therefore sum should be reported to one decimal place only. After rounding off, reported sum is 13.1 which has three significant figures.

CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307068 Find the value of $- 197^{\circ} C$ temperature in Kelvin.

1

47 K

2

76 K

3

470 K

4

760 K

Explanation:

Relation between $^{\circ} C$ and $K$ is
$K =^{\circ} C + 273.15 = - 197^{\circ} C + 273.15$
$= 76.15 K \approx 76 K$

MHTCET - 2021

CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307081 Which of the following is correct?
(i) $\frac{5.28 \times 0.156 \times 3}{0.0428} = 57.7$
(ii) $\frac{5.28 \times 0.156 \times 3}{0.0421} = 58.7$
(iii) $\frac{42.967 \times 0.02435}{0.34 \times 4} = 0.77$

1 (i) and (ii)

2 (i), (ii) and (iii)

3 (i) and (iii)

4 (ii) and (iii)

CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307082 Given the numbers: 161cm, 0.161 cm, 0.0161cm. The number of significant figures for the three numbers are

1 3, 4 and 5 respectively

2 3, 3 and 3 respectively

3 3, 3 and 4 respectively

4 3, 4 and 4 respectively

CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307083 The number of significant figures in value of $π$ are

1 1

2 2

3 3

4

\infty

Explanation:

$π$ is an irrational number (note that $π \neq 22 / 7$ as $22 / 7$ is a rational number) and it means it has infinite number of significant figures.

CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307084 The correctly reported answer of the addition of $4.523, 2.3$ and 6.24 will have significant figures

1 two

2 three

3 four

4 five

Explanation:

$4.523 + 2.3 + 6.24 = 13.063$ . As 2.3 has least number of decimal places, i.e. one, therefore sum should be reported to one decimal place only. After rounding off, reported sum is 13.1 which has three significant figures.

CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307068 Find the value of $- 197^{\circ} C$ temperature in Kelvin.

1

47 K

2

76 K

3

470 K

4

760 K

Explanation:

Relation between $^{\circ} C$ and $K$ is
$K =^{\circ} C + 273.15 = - 197^{\circ} C + 273.15$
$= 76.15 K \approx 76 K$

MHTCET - 2021

CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307081 Which of the following is correct?
(i) $\frac{5.28 \times 0.156 \times 3}{0.0428} = 57.7$
(ii) $\frac{5.28 \times 0.156 \times 3}{0.0421} = 58.7$
(iii) $\frac{42.967 \times 0.02435}{0.34 \times 4} = 0.77$

1 (i) and (ii)

2 (i), (ii) and (iii)

3 (i) and (iii)

4 (ii) and (iii)

CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307082 Given the numbers: 161cm, 0.161 cm, 0.0161cm. The number of significant figures for the three numbers are

1 3, 4 and 5 respectively

2 3, 3 and 3 respectively

3 3, 3 and 4 respectively

4 3, 4 and 4 respectively

CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307083 The number of significant figures in value of $π$ are

1 1

2 2

3 3

4

\infty

Explanation:

$π$ is an irrational number (note that $π \neq 22 / 7$ as $22 / 7$ is a rational number) and it means it has infinite number of significant figures.

CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307084 The correctly reported answer of the addition of $4.523, 2.3$ and 6.24 will have significant figures

1 two

2 three

3 four

4 five

Explanation:

$4.523 + 2.3 + 6.24 = 13.063$ . As 2.3 has least number of decimal places, i.e. one, therefore sum should be reported to one decimal place only. After rounding off, reported sum is 13.1 which has three significant figures.

CHXI01:SOME BASIC CONCEPTS OF CHEMISTRY

307068 Find the value of $- 197^{\circ} C$ temperature in Kelvin.

1

47 K

2

76 K

3

470 K

4

760 K

Explanation:

Relation between $^{\circ} C$ and $K$ is
$K =^{\circ} C + 273.15 = - 197^{\circ} C + 273.15$
$= 76.15 K \approx 76 K$

MHTCET - 2021