Chemistry Chapter No.1 Basic Concepts 1st Year Online MCQs

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Book Name : Chemistry
Chapter No. 01
Chapter Name : Basic Concepts
Total MCQ from Text Book : 66
Book Version : 2022
Published By : Punjab Text Book Board Lahore
Approved By : Govt of the Punjab and Federal Ministry for Education
Test Type : MCQ’s
Exam conduct By : Inter Boards of Sindh, KPK, Balochistan, AJK, Gilgit Baltistan, Punjab & Federal
Class / Grade : 11 ( F.Sc. Intermediate)
Total Marks : 66
Total Time : 66 minutes

GRADE 11 - CHEMISTRY CHAPTER NO. 1 BASIC CONCEPTS

1 / 66

Which one is the empirical formula of a compound?

Hg2Cl2

Al2Cl6

HgCl2

B2H6

2 / 66

Out of 280 isotopes that occur in nature, number of isotopes with even mass number and even atomic number:

104

154

118

205

3 / 66

1 g ions of CO^-2₃ weighs:

60 g

120 g

140 g

215 g

4 / 66

In combustion analysis, the weight of CO2 absot a Pr is increased due to formation of:

KCl

KOH

K2CO3

5 / 66

Number of moles of water present in 90 g of water are:

6 / 66

Many elements have fractional atomic masses. This is because:

Atomic masses are average masses of isobars.

The mass of the atom is itself fractional.

Atomic masses are average masses of isotopes proportional to their relative abundance.

Atomic masses are average masses of isotopes.

7 / 66

What is the maximum mass of Cr that can be extracted from 76 g of Cr203? (Retative mass of Cr.= 52)

48 g

104 g

152 g

52 g

8 / 66

The volume occupied by 1.4 g of N2 at S.T.P. is:

1.12 dm3

22.4 dm3

112 cm3

2.24 dm3

9 / 66

Which is a different cation?

NH+ 4

Zn2+

Cu2+

Ca2+

10 / 66

The diameter of, atoms are in the order, according to X-ray work:

0.2 nm

2 x 10-10m

All of these

11 / 66

The number of moles of CO2 which contain 8 g of oxygen:

1.5

0.5

0.25

12 / 66

1.5 mol of 02 combines with Mg to form MgO. The mass of Mg (atomic mass 24) that has combined is:

36 g

72 g

48 g

24 g

13 / 66

In a mass spectrum, the height of the peak explains:

Atomic number

Number of electrons

relative abundace of isotopes

Number of istotpes

14 / 66

Point out set of specie which are iso-electronic?

F-,Cl-,Br-

F-,Na+,Ne

Ca2+,Mg2+,Ac3+

O-1,O+,O

15 / 66

Isotopes differ in:

Properties which depend upon mass.

Arrangement of electrons in orbitals.

Chemical properties.

The extent to which they may be affected in electromagnetic field.

16 / 66

Number of atoms present in 1 mole of NaOH:

2x6.02 1023 atoms/mole

None of these

6.02 x 1023 atoms/mole

3x6.02 1023 atoms/mole

17 / 66

When we compare one mole each of 0₂and H₂, then we observe:

None of these

O2 has greater number of molecules than N2

Same number of molecules

N2 has greater number of molecules than O2

18 / 66

The volume of 2.2g of CO2 at STP is:

None of these

24.414 dm3

2.24 dm3

1.12 dm3

19 / 66

The radius of atoms are in the range:

20 / 66

A limiting reactant is the one which:

Is taken in lesser quantity in volumes as compared to other reactants

Gives the minimum amount of the product under consideration.

Carries the maximum amount of the product which is requried

Is taken in lesser quantity in grams as compared to other reactants.

21 / 66

How many grams of water will be formed when 16g Hydrogen reacts with 32g oxygen?

48 g

18 g

36 g

52 g

22 / 66

Mass spectrometer separates different positive isotopic ions on the basis of their:

m/e value

charge value

e/m value

mass value

23 / 66

The highest percentage of oxygen by weight is present in :

C3H7OH

C2H5OH

H2O2

CH3OH

24 / 66

The number of atoms in 4.25g of NH3 is approximately:

1.5 x 1023

1 x 1023

6 x 1023

2 x 1023

25 / 66

8g of 02 reacts with 8g I-12, the mass of H2O formed is:

6 g

18 g

16 g

9 g

26 / 66

The highest number of molecules are present in:

50 g O2

50 g SO2

50 g CO2

50 g Cl2

27 / 66

The number of moles of CO2 containing 8g of oxygen:

0.5

2.5

1.5

0.25

28 / 66

Gold has number of isotopes:

29 / 66

Haemoglobin is:

macromolecule

polymeric complex molecule

All of these

Poly atomic molecule

30 / 66

The volume occupied by 1.6 g of 02 at STP:

22.4 dm3

1.12 dm3

2.24 dm3

44.8 dm3

31 / 66

Which of the following statement is not true?

Isotopes with even atomic masses and odd atomic numbers are comparatively abundant.

Isotopes with even atomic masses are comparatively abundant

Isotopes with odd atomic masses are comparatively abundant.

32 / 66

Formation of uninegative ion is:

Exothermic

Endothermic

Both a,b

None of these

33 / 66

1 mole of CH₄ contains

6.02 x 1023 atoms

1.81 x 1023 molecules of CH4

3 g of carbon

4 g atoms of hydrogen

34 / 66

Maximum number of atoms are present in:

1 g of Cu

1 g of Ca

1 g of pt

1 g of U

35 / 66

Gold, Arsenic, Fluorine and Iodine are:

di-isotopic elements

tri-isotopic elements

mono-isotopic elements

tetra-isotopic elements

36 / 66

Total number of electrons present in 20g of CaCO3:

3.01 x 1023

6.02 x 1022

6.02 x 1024

6.02 x 1023

37 / 66

The percentage of Sodium

67.5

77.5

57.5

37.5

38 / 66

The mass of glucose which contains 6.02 x 1022 molecules:

180 g

18 g

36 g

90 g

39 / 66

The mass of Aluminium in 51 g of Al203 is:

13 g

54 g

27 g

108 g

40 / 66

Which of the following does not have same empirical and molecular formula?

Ethylene glycol

Acetone

Sucrose

formaldehyde

41 / 66

Silver has number of isotopes:

42 / 66

Which of the following leads to the formation of compound?

filtration

Melting

Freezing

Combusion

43 / 66

27g of al will react completely with how much mass of O₂ to produce AlO₂O₃

24 g of oxygen

8 g of oxygen

16 g of oxygen

32 g of oxygen

44 / 66

The total number of atoms in 64 g of sulphur dioxide is:

6.02 x 1023

2.408 x 1024

1.806 x 1024

12.04 x 1023

45 / 66

Percentage yield is the ratio

Actual yield to the theoretical yield

Theoretical yield to actual yield

Actual yield to the theoretical yield 100

Theoretical yield to actual yield into 100

46 / 66

Which one is a molecular ion?

N+2 2

Fe+3

NH+1 5

F-1

47 / 66

Mass of Sodium in 53g of Na2CO3 is:

34 g

11 g

23 g

46 g

48 / 66

It is not a molecular ion:

N+ 2

CH+ 4

CO+ 2

NH+ 4

49 / 66

The largest number of molecules-are present in:

4.6 g of C2H5OH

3.6 g of H2O

2.8 g of CO

5.4 g of N2O5

50 / 66

112 g iron reacts with steam to produce H2 and Fe(OH)2 Amount of H2 produced in this reaction

Fe+2H2O ------> Fe(OH)2 + H2

51 / 66

One amu is equal to

1.661 x 1027 kg

1.661 x 10-24 kg

1.661 x 10-27 g

1.661 x 10-27 kg

52 / 66

"Isotopy" was discovered first of all by:

Dalton

Einstein

Van der Waal

Soddy

53 / 66

22414 cm3 of an ideal gas is equal to:

1 mole

10 moles

2 mole

3 moles

54 / 66

The mass of one mole of electron is:

1.673 mg

0.55 mg

0.184 mg

1.008 mg

55 / 66

One mole of SO2 contains:

18.1 x 1023 molecules of SO2

6.02 x 1023 atoms of sulphur

6.02 x 1023 atoms of oxygen

4 gram atoms of SO2

56 / 66

Which of the following is approximately 3400 times lighter than haemoglobin molecule?

12Mg

20Ne

40Ca

4He

57 / 66

The number of molecules present in 3g of water is:

1 x 1023

6.2 x 1023

1.5 x 1023

3 x 1023

58 / 66

Palladium has no of isotopes:

59 / 66

Isotopes donot differ in:

Half life

mass

Shape

Radio activity

60 / 66

Which of the following sample of CO2 has least number of molecules?

22 g

3.01 x 1023 molecules

11.2 dm3 at S.T.P

0.1 mole

61 / 66

16g of H2 reacts with 16g of 02. The mass of H2O formed is:

4.5g

36 g

9 g

18 g

62 / 66

Fluorine atom and fluoride ions:

are allotropes of F

Have same no of electrons

Have same no of protons

are chemically identical

63 / 66

How many peaks would appear in mass spectrograph when we run C-12:

64 / 66

CO⁺ is an example of:

Stable molecule

anionic molecular ion

free radical

cationic molecular ion

65 / 66

Tin (element) has number of isotopes:

66 / 66

A ring contains 1.2 g of diamond. No. of carbon atoms in this diamond is:

6.02 x 1022

3.01 x 1022

3.01 x 1023

6.02 x 1023

Your score is

The average score is 32%

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