INTRODUCTION TO FUNDAMENTAL CONCEPTS OF CHEMISTRY

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INTRODUCTION TO FUNDAMENTAL CONCEPTS OF CHEMISTRY

1 / 80

If 20g CaCO3 is added to 20g HCL, select the true statement:

2 / 80

Under the right conditions, ammonia can be converted to nitrogen monoxide, NO, by the following reaction. NH3 + O2 → NO+H2O.How many grams of H2O could be formed from a mixture of 51g of NH3 and 48g of O2

3 / 80

2 mol of H2S and 11.2 dm³ of SO2 at STP react according to the following equation: SO2 + 2H2S → 2H2O+3S

What will be the number of moles of sulphur formed in the reaction?

4 / 80

Empirical formula of a hydrocarbon containing 80% carbon and 20% hydrogen is:

5 / 80

The empirical formula of compound is CH2. The mass of one mole of the compound is 32g. Therefore, its structural formula is:

6 / 80

 A gaseous hydrocarbon gives upon combustion 0.72g of water and 3.08g of CO2, The empirical formula of the hydrocarbon is:

7 / 80

Styrene, the raw material for polystyrene plastic, has an empirical formula of CH. Its molecular mass is 104 g mol-1. What is its molecular formula? 

8 / 80

A sample of mercury (II) sulphide contains 82.6% mercury by mass. The mass of HgS that can be made from 30 g of mercury is [At. Wt. of Hg=201,  S = 32]:

9 / 80

Which of the following contains the maximum number of atoms?

10 / 80

The amount of oxygen in 3.6 moles of water is:

11 / 80

The ratio of masses of oxygen and nitrogen in a particular gaseous mixture 1:4. The ratio of number of their molecule is:

12 / 80

How many moles of magnesium phosphate, Mg3(PO4)2 will contain 0.25 mol of oxygen atoms?

13 / 80

A vessel contains 10g of N2, 10g of H2 and 10g of O2. Which one has largest number of atoms?

14 / 80

One mole of (NH4)2 HPO4 contains moles of hydrogen atom.

15 / 80

Signature of a person with lead pencil increased the weight of the paper by 1.2 grams. How many atoms of carbon are present?

16 / 80

Hydrogen burns in chlorine to produce hydrogen chloride. The ratio of masses of reactants in chemical reaction H2 + Cl2 2HCL is:

17 / 80

One mole of CH4 contains:

18 / 80

All of the following statements are incorrect for 20mole of Water except:

19 / 80

Avogadro's number is the number of molecules present in:

20 / 80

The volume of oxygen required for complete of a mixture of 5cm³ of CH4 , and 5cm³ of C2H4

21 / 80

Actual yield is less than theoretical yield because of:

22 / 80

No. of moles of CO2 which contains 8.0g of oxygen 

23 / 80

Volume occupied by 11 g of carbon dioxide at 0°C and 1 atm pressure is:

24 / 80

Methane reacts with steam to form CO and H2.

CH4+H2O →  CO+ 3H2

What volume of hydrogen gas can be obtained from 100cm³ of methane at STP?

 

25 / 80

In a sample of glucose, there are 3.6 x 10^24 atoms of carbon. Mass of glucose sample is:

26 / 80

To work out the molecular mass of an organic molecule you would look at its..

27 / 80

Which of the following is not a use for mass spectrometry?

28 / 80

The path of ions after deflection depends on.

29 / 80

Which one of the following statements about ionization in a mass spectrometer is incorrect?

30 / 80

The correct order for the basic features of a mass spectrometer is:

31 / 80

A compound is decomposed in the laboratory and produces 1.40g N and 0.20g H. What is the empirical formula of the compound?

32 / 80

Which compound has the highest mass percent C?

33 / 80

The compound A2X is 35.8%A by mass. What mass of the compound contains 55.1g A?

34 / 80

Combustion analysis is used to determine? 

35 / 80

The pressure of vapors maintained in ionization chamber of mass spectrometer during isotopic analysis is:

36 / 80

Height of peak in mass spectrum shows: 

37 / 80

Dempster's mass spectrometer was designed for the identification of isotopes of the elements which were available in:

38 / 80

Which one of the following compounds contains the highest percentage by mass of nitrogen?

39 / 80

If the strength of magnetic field is two times stronger than electric field and radius is 2m, then m/e ratio is:

40 / 80

The compound which have same molecular and empirical formula:

41 / 80

Which pair shows empirical formula CH₂O? 

42 / 80

The empirical formula of compound having 50% sulphur and 50% oxygen by mass:

43 / 80

The molecular weight of compound is 110g/mol and empirical formula is C3H3O, the molecular formula of compound is: 

44 / 80

Which of the following form single peak in mass spectrograph? 

45 / 80

 If 24 g of organic compound is burnt in combustion tube and gives 22g of CO₂. The %age of carbon is:

46 / 80

The relative abundance of the ion with a definite m/e value is measured by: 

47 / 80

Empirical formula and formula unit of an ionic compound:

48 / 80

Styrene, the raw material for polystyrene foam (plastics), has an empirical formula of CH. Its molecular mass is 104 g mol. What is its molecular formula?

49 / 80

The mathematical relationship for m/e in terms of radius of curvature of ions, strength of electrical field (E) and magnetic field strength (H) is:

50 / 80

Which one of the following is the molecular formula of hydrocarbon which contains 80% by mass of carbon and 20% by mass of hydrogen?

51 / 80

Which of the following statement is not involved in determination of empirical formula?

52 / 80

Mass spectrometer is used to determine:

53 / 80

An element has four naturally occurring isotopes; the mass and natural abundance of each isotope. Find the atomic mass of the element.

54 / 80

What is the charge of the Cr ion that contains 21 electrons?

55 / 80

How many electrons does the predictable (most common) ion of fluorine contain?

56 / 80

An ion composed of which of these particles would have a mass of approximately 16 amu and a charge of 2-?

57 / 80

 If an atom with a mass number of 27 has 14 neutrons, it is an stope of which element?

58 / 80

How many protons and neutrons are in the chromium isotope Cr?

59 / 80

Boron has two stable isotopes, 10B (19%) and 11B (81%) Find the average atom mass of Boron:

60 / 80

Which of the following term is used for the mass of chlorine 35.5 amu

61 / 80

No. of peaks in mass spectrum represents: 

62 / 80

How many moles of neutron are present is one mole of heavy water?

63 / 80

CN-1 is isoelectronic with:

64 / 80

Fractional average atomic masses can be calculated from:

65 / 80

Isotopes are sister atoms of same element with similar chemical properties but different:

66 / 80

Out of 280 isotopes which occur in nature, the radioactive isotopes are:

67 / 80

Which of the pair represents isobars?

68 / 80

Chlorine has two isotopes, Cl-35 and CL-37, having relative abundance 75.53% & 24.47% respectively. The average atomic mass of chlorine is:

69 / 80

.If we consider that 1/6, in place of 1/12, mass of carbon atom is taken to be the relative atomic mass unit, the mass of one mole of a substance will:

70 / 80

Given that the abundances of isotopes 54Fe, 56Fe and 57Fe are 5%, 90% and 5%, respectively. The atomic mass of Fe is:

71 / 80

1 amu is equal to:

72 / 80

Which statement is incorrect about the isotopes of an element?

73 / 80

23/11Na and 24/12Mg are related to each other:

74 / 80

The relative atomic mass of oxygen according to C-12.000 amu standard is:

75 / 80

Silver has isotopes:

76 / 80

Which of the following elements has larger number of isotopes:

77 / 80

Which of the following statement is true:

78 / 80

Isotopes of an element differ in: 

79 / 80

Which of the following term is used for isotopes?

80 / 80

Which of the following is /are correct stat 

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