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 a molecular ion?

NH+1 5

N+2 2

Fe+3

F-1

2 / 66

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

3 / 66

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

formaldehyde

Sucrose

Ethylene glycol

Acetone

4 / 66

One amu is equal to

1.661 x 10-27 g

1.661 x 10-27 kg

1.661 x 1027 kg

1.661 x 10-24 kg

5 / 66

The largest number of molecules-are present in:

3.6 g of H2O

2.8 g of CO

4.6 g of C2H5OH

5.4 g of N2O5

6 / 66

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

22 g

0.1 mole

11.2 dm3 at S.T.P

3.01 x 1023 molecules

7 / 66

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

0.5

1.5

0.25

8 / 66

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

112 cm3

1.12 dm3

22.4 dm3

2.24 dm3

9 / 66

CO⁺ is an example of:

anionic molecular ion

free radical

Stable molecule

cationic molecular ion

10 / 66

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

48 g

18 g

52 g

36 g

11 / 66

The highest percentage of oxygen by weight is present in :

C2H5OH

H2O2

C3H7OH

CH3OH

12 / 66

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

40Ca

12Mg

20Ne

4He

13 / 66

Tin (element) has number of isotopes:

14 / 66

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

0.2 nm

2 x 10-10m

All of these

15 / 66

Point out set of specie which are iso-electronic?

F-,Cl-,Br-

O-1,O+,O

F-,Na+,Ne

Ca2+,Mg2+,Ac3+

16 / 66

The mass of one mole of electron is:

0.184 mg

1.008 mg

0.55 mg

1.673 mg

17 / 66

22414 cm3 of an ideal gas is equal to:

2 mole

1 mole

3 moles

10 moles

18 / 66

1 mole of CH₄ contains

3 g of carbon

1.81 x 1023 molecules of CH4

6.02 x 1023 atoms

4 g atoms of hydrogen

19 / 66

"Isotopy" was discovered first of all by:

Van der Waal

Einstein

Soddy

Dalton

20 / 66

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

m/e value

e/m value

charge value

mass value

21 / 66

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

1.5

0.25

2.5

0.5

22 / 66

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

23 / 66

Which one is the empirical formula of a compound?

Hg2Cl2

HgCl2

B2H6

Al2Cl6

24 / 66

A limiting reactant is the one which:

Carries the maximum amount of the product which is requried

Gives the minimum amount of the product under consideration.

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

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

25 / 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.

Isotopes with even atomic masses are comparatively abundant

26 / 66

The mass of glucose which contains 6.02 x 1022 molecules:

180 g

36 g

90 g

18 g

27 / 66

The volume of 2.2g of CO2 at STP is:

1.12 dm3

None of these

2.24 dm3

24.414 dm3

28 / 66

Mass of Sodium in 53g of Na2CO3 is:

34 g

11 g

46 g

23 g

29 / 66

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

KCl

K2CO3

KOH

30 / 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

31 / 66

The radius of atoms are in the range:

32 / 66

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

154

205

118

104

33 / 66

Total number of electrons present in 20g of CaCO3:

6.02 x 1023

6.02 x 1024

6.02 x 1022

3.01 x 1023

34 / 66

Number of atoms present in 1 mole of NaOH:

None of these

3x6.02 1023 atoms/mole

6.02 x 1023 atoms/mole

2x6.02 1023 atoms/mole

35 / 66

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

3.01 x 1022

6.02 x 1022

6.02 x 1023

3.01 x 1023

36 / 66

Isotopes donot differ in:

Half life

Shape

mass

Radio activity

37 / 66

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

9 g

36 g

18 g

4.5g

38 / 66

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

Number of electrons

Atomic number

Number of istotpes

relative abundace of isotopes

39 / 66

1 g ions of CO^-2₃ weighs:

60 g

140 g

215 g

120 g

40 / 66

One mole of SO2 contains:

6.02 x 1023 atoms of sulphur

6.02 x 1023 atoms of oxygen

18.1 x 1023 molecules of SO2

4 gram atoms of SO2

41 / 66

Gold, Arsenic, Fluorine and Iodine are:

tri-isotopic elements

di-isotopic elements

tetra-isotopic elements

mono-isotopic elements

42 / 66

Which is a different cation?

Cu2+

Zn2+

Ca2+

NH+ 4

43 / 66

Fluorine atom and fluoride ions:

Have same no of electrons

are allotropes of F

Have same no of protons

are chemically identical

44 / 66

Silver has number of isotopes:

45 / 66

The volume occupied by 1.6 g of 02 at STP:

22.4 dm3

2.24 dm3

1.12 dm3

44.8 dm3

46 / 66

Formation of uninegative ion is:

Both a,b

Endothermic

Exothermic

None of these

47 / 66

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

O2 has greater number of molecules than N2

None of these

N2 has greater number of molecules than O2

Same number of molecules

48 / 66

The percentage of Sodium

77.5

67.5

57.5

37.5

49 / 66

Maximum number of atoms are present in:

1 g of Cu

1 g of U

1 g of pt

1 g of Ca

50 / 66

Percentage yield is the ratio

Actual yield to the theoretical yield

Theoretical yield to actual yield into 100

Actual yield to the theoretical yield 100

Theoretical yield to actual yield

51 / 66

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

18 g

9 g

16 g

6 g

52 / 66

Isotopes differ in:

Properties which depend upon mass.

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

Chemical properties.

Arrangement of electrons in orbitals.

53 / 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

24 g

48 g

54 / 66

Gold has number of isotopes:

55 / 66

The highest number of molecules are present in:

50 g O2

50 g CO2

50 g SO2

50 g Cl2

56 / 66

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

152 g

48 g

104 g

52 g

57 / 66

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

24 g of oxygen

32 g of oxygen

16 g of oxygen

8 g of oxygen

58 / 66

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

1.5 x 1023

1 x 1023

3 x 1023

6.2 x 1023

59 / 66

Which of the following leads to the formation of compound?

Melting

Freezing

Combusion

filtration

60 / 66

Palladium has no of isotopes:

61 / 66

It is not a molecular ion:

CH+ 4

N+ 2

CO+ 2

NH+ 4

62 / 66

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

1 x 1023

6 x 1023

1.5 x 1023

2 x 1023

63 / 66

The mass of Aluminium in 51 g of Al203 is:

27 g

108 g

13 g

54 g

64 / 66

Many elements have fractional atomic masses. This is because:

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

Atomic masses are average masses of isobars.

The mass of the atom is itself fractional.

Atomic masses are average masses of isotopes.

65 / 66

Haemoglobin is:

Poly atomic molecule

macromolecule

All of these

polymeric complex molecule

66 / 66

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

1.806 x 1024

2.408 x 1024

6.02 x 1023

12.04 x 1023

Your score is

The average score is 30%

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