CHEMISTRY TEST 1 - PAK ARMED FORCES TEST

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Results

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QUIZ START

#1. Which of the following statement is not related with fibrous proteins?

Most have secondary structure

Play structural role

non- elastic and crystalline

Includes actin, myosin & fibrin

#2. Which of the following type of lipids are included in polymers?

Fatty acids

Phospholipids

Terpenoids

Waxes

#3. What is ribonucleoside?

ribose + nucleic acid

ribose + nitrogen base

ribose + phosphate

ribose + adenine

#4. All the following are nucleosides except.

adenosine

cytosine

guanosine

uridine

#5. How many carbon atoms contribute to form a Pyran ring in glucopyranose?

#6. Mitochondria are found in:

Prokaryotic cells only

Both prokaryotic and eukaryotic cells

Eukaryotic cells only

in bacterial cells only

#7. 12g of Mg reacts with 73 g of dil. HCl to produce 1g of H2 gas, then the correct statement is:

HCl is limiting reactant

Mg is in excess

HCl stops the chemical reaction

Mg consumes earlier

#8. 0.5 moles of each aluminium and oxygen react to produce aluminium oxide. The amount of product formed is:

0.5 mole

0.25 mole

0.33 mole

1 mole

#9. 0.25 moles of CO2 will have the volume at STP?

22.414dm3

11.207dm3

5.6dm3

16.5dm3

#10. The number of oxygen atoms in 3 moles of water are.

3 x NA

9 x NA

6 x NA

#11. 16g of CH4 react completely with 18g of water to give carbon dioxide and hydrogen. The moles of hydrogen produced are.

#12. A container contains 18.0g water then which of the following is incorrect

1NA water molecule

1NA O-atoms

1NA H atoms

2NA H-atoms

#13. Which of the following is not used for elements

Relative atomic mass

Fractional atomic mass

Mass number

Average atomic mass

#14. How many electrons are present in 1g atom of oxygen

6.022 x 10^23

1.2 x 10^24

4.8 x 10^24

7.2 x 10^24

#15. What are the number of moles of nitrogen in 274 grams of (NH4)2Ce(NO3)6?

#16. What are the number of molecules of water in CuSO4.5H2O, if the weight of oxygen in it is 36 grams?

3.25 x 10^23

5.25 x 10^23

7.52 x 10^23

9.52 x 10^23

#17. Consider the following reaction Ca + 2HCl -> CaCl2 + H2 When 40 g Ca is heated with 3 moles of HCl. The volume of H2 gas obtained at RTP is

22.4dm3

11.2dm3

24.0dm3

1.12dm3

#18. A compound contains two elements X and Y percentage of x is 20% (at.wt=40) and that of Y is 80% (AT.wt=80). The empirical formula of the compound is

XY2

X2Y

X3Y

#19. if 25 g each of CaCO3 and H2SO4 reacts with each other the amount of CaSO4 formed:

30 g

32 g

34 g

36 g

#20. The volume of NH3 obtained by the combination of 10cm3 of N2 and 30cm3 of H2 is

10 cm3

20 cm3

30 cm3

40 cm3

#21. The relative abundance of Pb isotopes is 1.5 % Pb204, 23.6 % Pb206, 22.6 % Pb207, 52.3 % Pb208. The relative atomic mass of Pb is

207.94

208.24

206.94

207.24

#22. Which of the following compounds contains the highest percentage by mass of nitrogen?

Ammonia, NH3

Ammonium carbonate, NH2CO2NH4

ammonium carbonate, (NH4)2CO3

Hydrazine, N2H4

#23. The empirical formula of a liquid compound is known to be C2H4O. What other information is needed to work out its molecular formula?

The percentage composition of the compound

The relative molecular mass of the compound

The density of the compound

The volume occupied by one mole of the compound

#24. Quicklime (calcium oxide) is manufactured by heating limestone (calcium carbonate) as shown by the following equation. CaCO3 -> CaO + CO2 What mass of quicklime can be produced by heating one kg of limestone?

28/204 kg

28/100 kg

56/124 kg

56/100 kg

#25. Relative atomic mass, Ar

mass of one atom of an element / mass of one atom of C-12

mass of one atom of an element / 1/12 the mass of one atom of C-12

average mass of an atom of an element / mass of one atom of C-12

average mass of an atom of an element / 1/12 the mass of one atom of C-12

#26. The region on the diagram where solid water is undergoing a change primarily in kinetic energy is between

I and II

II and III

I and III

III and IV

#27. Ethanol is common alcohol. It can be made by the fermentation of the solution of a sugar like glucose (C6H12O6): How many moles of ethanol would be produced if 9 gram of glucose were used?

0.01 moles

0.10 moles

0.05 moles

0.25 moles

#28. Which of the following is fundamental unit for amount of substance in SI units?

Gram

Mole

Kilogram

Milligram

#29. Consider a rocket manufacturer uses liquid hydrogen as a fuel. He may have to determine how much fuel is necessary for a particular flight: Hydrogen burns in oxygen (of air) to produce water. Which of the following statements is/are correct about this?

Two moles of hydrogen react with one mole of oxygen to form two moles of water

Two molecules of hydrogen react with one molecule of oxygen to produce two molecules of steam

Four grams of hydrogen react with thirty-two grams of oxygen to produce thirty-six grams of water

All of these

#30. In a closed flask of one dm3, 20 g of hydrogen gas is heated from 27°C to 127°C. Which of the following is incorrect statement about it?

The number of moles of the gas increases

The K.E of gaseous molecules increases

The rate of collision increases

Pressure of the gas increases

#31. Which of the following exerts the highest pressure? Supposed (R = 5.0 J mol^-1 K^-1)

1 mol of N2 at 27°C in 10 dm3

1 mol of N2 at 27°C in 20 dm3

1 mol of H2O at 27°C in 1 dm3

1 mol of C5H12 at its normal boiling point

#32. If we want to raise the temperature of one mole of an ideal gas by one kelvin, we have to provide how much amount of energy?

0.0821 dm3 atm

8.314 dm3 atm

0.0821 Kj

0.0821 Joules

#33. The process of heat flow between hotter and colder gases remains continued until all the molecules have equal:

Average translational kinetic energy

Average rotational kinetic energy

Average translational potential energy

Average vibrational kinetic energy

#34. Gases deviate from ideal behavior at high pressure. Which of the following is correct statement for non-ideal

At high pressure, the gas molecules move in one direction only

At high pressure, the collisions between the gas molecules are increased manifold

At high pressure, the intermolecular attractions become significant

At high pressure, the volume of the gas becomes insignificant

#35. All of the following factors do not affect vapour pressure of a liquid EXCEPT:

Size of liquid molecules

Volume of liquid

Amount of liquid

Surface area

#36. Which of the following factors do not affect vapour pressure of a liquid EXCEPT: (Correction: is a crystalline’s basic repetitive structural unit.)

Monomer

Molecule

Unit cell

Atom

#37. Molar heat of vaporization (ΔHvap) of water is 40.7 kJ mol^-1; This molar heat of vaporization is required to break:

H-bonding only

van der Waal's forces only

Dipole-dipole forces only

Both hydrogen bonding and van der Waal's forces

#38. All of the following statements are correct for giant metallic structure EXCEPT:

Al, Mg and Pt show face centered cubic structure

The coordination number of simple cubic structure is 8

Zn, Cd, Mg and ice shows hexagonal close packed structure

All the alkali metals have a body centered cubic structure

#39. Consider the following statements about molar heat of vaporization (ΔHvap): I. The amount of heat required to convert one mole of liquid into vapours at its boiling points is called ΔHvap

I only

II only

II and III

I, II and III

#40. The molecules of a gas A travel four times faster than the molecules of gas B at same temperature. The ratio of molecular weights (MA/MB) is:

1/16

1/4

#41. 0.2 mole sample of hydrocarbon CxHy yields after complete combustion with excess O2 gas, 0.8 mole of CO2, 1.1 mole of H2O. Hence hydrocarbon is

C4H10

C4H8

C4H6

C4H16

#42. Sulfur exists in two polymorphic forms _ and _

rhombic and monoclinic

rhombic and triclinic

hexagonal and triclinic

hexagonal and monoclinic

#43. Which of the following is the most accurate method to measure vapour pressure of a liquid?

Manometric method only

Both barometric and manometric method

Barometric method only

Difficult to predict

#44. Identify incorrect statement:

Metallic solids: Malleable and ductile

Ionic solids: Hard and brittle

Covalent solids: Higher melting and boiling points

Molecular solids: Their basic unit is atom

#45. Which of the following liquids has lower boiling point?

Ethanol

Hydrofluoric acid

Propanone

Ethanal

#46. Hydrogen bonding is unimportant in?

The liquid properties of water

Liquid HF

DNA structure

Liquid CH4

#47. Thermal conductivity of graphite is greater when mobile electrons are moving to its layers:

Perpendicular

Right angle

Parallel

All of these

#48. Which of the following gases has the lowest r.m.s velocity at 25°C?

SO2

Cl2

#49. Value of ideal gas constant R does not depend upon

Units of pressure

Units of volume

Units of Temperature

All of the above

#50. Which variable mentioned in ideal gas is assumed to be constant in other gas laws?

Volume

Pressure

Temperature

Number of moles

#51. Which of the following molecules will show a higher rate of evaporation?

Acetone

Water

Ethanol

Ethylene glycol

#52. In liquid, with the change in dipole-dipole forces, there is a change in some physical properties. Select the property which is not affected by the strength of dipole-dipole forces?

B.P

Heat of sublimation

Heat of vaporization

Moles

#53. Which of the following statement explains solubility of ionic substance in water?

Water molecule is polar

Water molar mass is 18.02

Water forms dative bonding

Water has high density

#54. Which of the following is isotropic property

Refractive index

Coefficient of thermal expansion

Cleavage

Metallic conduction

#55. When an element exist in more than one crystalline forms, it is known as

Anisotropy

Isomorphism

Allotropy

Polymorphism

#56. A solid may be made up of

Atoms

Ions

Molecules

A, B and C

#57. Small diffusion in solid is due to:

Very fast motion of its particles

Vibrational mentions of its particles

Rotational motion of its particles

Diffusion into solid is not present

#58. Amorphous solids?

Have prefect arrangement of atoms

Have sharp Melting point

Can possesses small regions of orderly arrangement of atoms

Undergo clean cleavage when cut with knife

#59. Which one of the following is not a crystalline solid?

Copper sulphate

Sugar

NaCl

Rubber

#60. Which one of the following is as light as a feather and as strong as iron?

Graphite

Mercury

Graphene

Diamond

Finish