MDCAT CHEMISTRY-Fundamental Concepts (SMART INSTITUTE)

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MDCAT Chemistry Challenge

Test your knowledge of fundamental chemistry concepts with our MDCAT Chemistry quiz! This quiz is designed to challenge students and enthusiasts alike, covering a range of topics from stoichiometry to mass spectrometry.

Get ready to dive into immersive questions that will help you solidify your understanding of chemistry. Whether you're preparing for exams or simply looking to refresh your knowledge, this quiz is for you!

Multiple choice format
Comprehensive coverage of key concepts
Ideal for MDCAT preparation

60 Questions15 MinutesCreated by ExploringAtom427

01-The stoichiometric calculations for a chemical reaction results in

Actual yield

Percentage yield

Theoretical yield

Selectivity

02-Mass spectrometry is used to determine the

Number of isotopes of an element

Relative abundance of isotopes

Relative isotopic mass

All of these

03. 1 gram molecule refers to amount in grams

Equivalent to 1 mole of an atom

Equivalent to 1 mole of a molecule

Equivalent to 1 mole of an ionic species

Of an ionic compound

04-Number of H+ ions when 0.1 mole of sulfuric acid is completely ionized in water:

4 x NA

1 x NA

2 x NA

2 x 6.022 x 10^22

05. 1 gram formula refers to:

Amount in grams equivalent to 1 mole of an atom

Amount in grams equivalent 1 mole of a covalent compound

Amount in grams equivalent to 1 mole of an ionic compound

Amount in grams equivalent to 1 mole of an ion

06-How many electrons have to be removed to ionize 1.0 x 10^6 moles of Ne atoms to Ne+ ions in a neon advertising tube.

6.02 x 10^23 / 1.0 x 10^-6

1.0 x 10^-6 x 6.02 x 10^23 / 20.2

1.0 x 10^-6 x 6.02 x 10^23

1.0 x 10^-6 x 6.02 x 10^23 / 9.65x110^-1

07-One mole of SO2 contains

6.022 x 10^23 atoms of oxygen

6.022 x 10^23 atoms of sulfur

18.1 x 10^23 molecules of SO2

4g molecule of SO2

08-Mg reacts with HCl as per the following reaction

Mg(s) + 2HCl(aq) → MgCl2(aq) + H2 (g)

Given that;Mg=21g and HCl=21g, the excess reactant is;

HCl

Both are in stoichiometric amounts

None of these

09. 5604 cm3 of H2 gas at STP contains atoms of hydrogen

6.02 x 10^23

3.01 x 10^23

2.6 x 10^22

1.50 x 10^23

10-Number of moles present in 0.6 gram of silica is

0.01 mole

0.064 mole

0.044 mole

0.054 mole

11-Gram atoms of hydrogen in 5.5g H2

5.50

2.25

5.45

2.20

12- % of Nitrogen in urea (NH2CONH2)

82.35

46.6

55.56

13-One mole of potassium chlorate is thermally decomposed and excess of aluminum is burnt in gaseous mixture. How many moles of aluminum oxide are formed?

Respective equations are given as

2KClO3 (MnO2)→ 2KCl + 3O2

4Al +3O2 → 2Al2O3

1.0

2.0

1.5

3.0

14-In a mass spectrometer, increasing the electric field with constant magnetic field results in

Increased radius "r"

Increased ionization energy

Decreased radius "r'

None of above

15-When 0.5 moles of Al2(SO4)3 are dissolved in water, total number of particles produced

1.2 x 10^23

3.0 x 10^23

1.5 x 10^24

2.5 x 10^23

16. 4 g of an unknown mass gas occupies 5.6 dm3 volume, at S.T.P the gas is:

SO2

CH4

H2S

17. The mass of one mole of Mg atoms is 24g. What is the mass of one Mg atom in grams?

3.99 x 10^^-23

6.02 x 10^-23

3.99 x 10^23

18-WOF contains 1 mole of the stated particles:

Chlorine molecules in 35.5 g of Chlorine gas

Electrons in 1 g of hydrogen gas

Hydrogen ions in 1 dm3 of 1 mol dm-3 aqueous sulfuric acid

Oxygen atoms in 22.4 dm3 of oxygen gas at STP

19-During combustion analysis, which one is used for absorbing carbon dioxide

50% KOH solution

Mg(ClO4)2

5% KOH

Silica gel

20. 1 amu=?

1.661 x 10^-27 g

1.661 x 10^-24 kg

1.661 x 106-19 kg

1.66 x 10^-21 mg

21-Molecular ions are produced in mass spectrometer. Which type of molecular ions formed more abundantly

Negatively charged

Positively charged

H+ ions

Equal positive and negative ions

22-The height of the peak in the mass spectrum shows

Number of isotopes

Mass number

Relative abundance

Number of protons

23-The separation of different isotopes in the mass spectrometer is done on the basis of:

Different amounts of positive charge on each ion

Different m/e

Different e/m value

Velocities of the ions

24-A compound contains 50% sulfur and 50% oxygen by mass. The empirical formula of the compound is:

S2O3

SO3

SO2

25-Equal volumes of CO and N2 are taken in identical conditions. The correct relationship between masses of two gases is;

CO=N2

All of These

26-The approximate number of molecules present in 3 g of H2O is

3 x 10^23

3 x 6.01 x 10^23

1 x 10^23

2 x 10^23

27-The mass of one molecule of O2 is

6.02 x 10^23 / 32

32 g

0.32 g

32 / 6.02 x 10^23

28-Combustion analysis is performed for the determination of

Molar mass of the compound

Structural formula of the substance

Empirical formula of the compound

Mass of the halogens present in organic compounds

29.The largest number of molecules are present in

3.6 of H2O

2.8 g of CO

4.6 g of C2H5OH

5.4 g of N2O5

30-The number of moles of CO2 which contain 16g of Oxygen

0.25

1.00

0.50

1.50

31-Haemoglobin molecule is how many times heavier than He atom.

68,000 times

17,000 times

34,000 times

1700 times

32-Atoms having same mass number but different atomic numbers are called

Isotopes

Isobars

Isotones

Isomers

33- 40 g of Calcium is

1 gram of Ca

1 gram atom of Ca

1 atom of Ca

1 gram ion of Ca

34-Amount of Oxygen in grams which contains 1.5 x 10^22 molecules

0.08

0.80

1280

35-What volume of Oxygen is required for complete combustion of 5 cm3 C2H2

2 cm3

12.5 cm3

5 cm3

13.5 cm3

36-How many atoms of carbon are present in 3.42 g

6.02 x 10^22

7.2 x 10^22

3.6 x 10^23

1.8 x 10^23

37-Absorption of CO2 in KOH solution during combustion analysis is:

Chemical change

Neither chemical nor physical change

Physical change

CO2 absorbed in Mg(ClO4)2

38- 10 moles of HCl is added to excess to Magnesium and forms 4 moles of Hydrogen gas. Percentage yield is

100

39-If you have 3.5 moles of Hydrogen and 5 moles of Nitrogen to produce Ammonia. How much Ammonia is produced?

34.08 g

39.6 g

17.04

None of these

40-Empirical formula of Vitamin C is:

C3H4O3

C4H8O7

C3H6O3

C6H12O6

41-Number of electrons in half mole of Na+

5.5 NA

5 NA

42-Amount of products obtained from balanced chemical equation represents

Actual yield

Practical yield

Theoretical yield

% yield

43-WOF compounds has highest percentage of Oxygen by weight

CH3OH

C2H5OH

HCOOH

H2O

44-Volume occupied by 4.4 g of CO2 at STP is

2.24 dm3

112 cm3

22.4 dm3

1.12 dm3

45-If a ring is made up 6g diamond, then number of atoms present in it are

6.02 x 10^23

3.01 x 10^23

1.5 x 10^23

7.5 x 10^22

46-WOF has least mass

7g of silver

1 gram atom of Nitrogen

3.01 x 10^23 atoms of carbon

1 mole of Neon gas

47-If empirical formula of a compound is CH2 and its molecular mass is 56 amu. What will be its molecular formula

CH2

C3H6

C2H4

C4H8

48-WOF compound have empirical formula, but no molecular formula.

H2O

H2O2

C6H6

NaCl

49-Moles of protons in 20g of SO3

50-WOF is a limitation of balanced chemical equation

A-conditions and rate of reactions

B-physical state and mechanism

C-reactants and products and their coefficients

D-both a and b

51-

6Na + Fe2O3 → 3Na2O + 2Fe

For above reaction, if you are provided with 230g of Na and 320g Fe2O3, then limiting reactant is

FeO3

Na2O

None of these

52- 3x10^-21 moles of an amino acid having molecular mass 200 gmol-1, would have molecules

200

1800

300

360000

53-Molecules formula =n x empirical formula, which statement is correct about 'n'

It can never be unity

It may be negative

It can never be zero

Not predictable

54- 11.207 dm3 of methane at STP has ......... Moles of hydrogen atoms.

55-The element showing 100% abundance in mass spectrum is

Chlorine

Arsenic

Bromine

Hydrogen

56-Mass of an atom of C is

12/NA g

12 x 1.661 x 10^-24 g

12 amu

All of these

57-WOF isotopes will have maximum deflection in magnetic field during mass spectrometric analysis

C-12

C-14

C-13

Same deflection

58-WOF contains same number of atoms as 12g of Mg

12g Carbon

5g Neon

10g Neon

3g Carbon

59-The sole products of combustion analysis are

CO2 and NH3

CO2 and KOH

H2O and Mg(ClO4)2

CO2 and H2O

60-Styrene has empirical formula CH, and there is 92.2 % C and 7.75% Hydrogen. If molar mass is 104 gmol-1, what will be integral multiple (n) to get molecular formula

MDCAT CHEMISTRY-Fundamental Concepts (SMART INSTITUTE)

MDCAT Chemistry Challenge

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