1. Some Basic Concepts of Chemistry

Question 1

Name 2 life saving drugs effective in cancer therapy -

Answer 1

Cisplatin and taxol

Question 2

________ is used for helping AIDS victims.

Answer 2

AZT (Azidothymidine)

Question 3

________ have definite volume but not definite shape.

Answer 3

Liquid

Question 4

Properties of a compound are different from its constituent elements. T/F

Answer 4

T

Question 5

Physical properties can be measured or observed without changing the identity or the composition of the substance. T/F

Answer 5

T

Question 6

Name the 7 SI base units.

Answer 6

m. kg, sec, Ampere, Kelvin, mole, candela

Question 7

Prefix used for 10-¹⁵ is -

Answer 7

Femto

Question 8

Prefix used for 10-¹² is -

Answer 8

Pico

Question 9

Prefix used for 10-⁹ is -

Answer 9

Nano

Question 10

Prefix used for 10-⁶ is -

Answer 10

Micro

Question 11

Sl unit of mass is gram T/F

Answer 11

F

Question 12

Write relation between °F and °C scale.

Answer 12

°F (9/5)°C+32

Question 13

13. Accuracy/Precision refers to the closeness of various measurements for the same quantity.

Answer 13

Precision

Question 14

What is Accuracy?

Answer 14

Accuracy is the agreement of a particular value to the true value of the result

Question 15

All non-zero digits are significant. T/F

Answer 15

T

Question 16

Zeros preceding the first non-zero digit are significant. T/F

Answer 16

F

Question 17

Zeros between two non-zero digits are not significant. T/F

Answer 17

F

Question 18

Zeros at the end or right of a number are significant, provided they are on the right side of the decimal point. T/F

Answer 18

T

Question 19

Significant figures in e (Euler Number) is -

Answer 19

∞

Question 20

According to significant figures, 2.5 × 2.50 =

Answer 20

6.2

Question 21

According to significant figures, 1.5 × 70 =

Answer 21

1.0 × 10

Question 22

Law of conservation of mass was given by -

Answer 22

Antoine Lavoisier

Question 23

Law of Definite proportions given by -

Answer 23

Joseph Proust

Question 24

Law of multiple proportions given by -

Answer 24

Dalton

Question 25

"Equal volumes of all gases at the same temperature and pressure should contain an equal number of molecules." This statement was given by -

Answer 25

Avogadro

Question 26

1 amu = kg

Answer 26

1.66 x 10-24 kg

Question 27

Define Mole

Answer 27

One mole is the amount of a substance that contains as many particles or entities as there are atoms in exactly 12 g of carbon-12 isotope

Question 28

Mass % =

Answer 28

(Mass of solute/mass of solution) × 100

Question 29

Mole fraction =

Answer 29

No. of moles of solute/(Moles of solute + Moles of solvent)

Question 30

Molarity =

Answer 30

No. of moles of solute/Volume of solution in litres

Question 31

Molality = ______ (NEET 2022)

Answer 31

No. of moles of solute/Mass of solvent in kg

Question 32

Molarity changes with change in temperature. T/F

Answer 32

T

Question 33

Dalton's atomic theory, regarded the atom as an ultimate particles of matter T/F (NEET 2023)

Answer 33

T