Uncategories Entry Test Preparation 2015, Chemistry BOOK 1 Chapter # 1 Basic Concepts MCQS with Answer sheet

Entry Test Preparation 2015, Chemistry BOOK 1 Chapter # 1 Basic Concepts MCQS with Answer sheet

zohaib hassan 11:01 PM

Entry Test Preparation 2015

Chemistry

BOOK 1

Chapter # 1

Basic Concepts

Direction

You are given following questions from the topic, with four choices A through D. Select the choice that ill answer the question best.

1. The percentage of oxygen in NaOH is

A. 40 B. 60

C. 8 D. 10

2. What quantity of limestone (CaCO₃) on heating will give 56 kg of CaO?

A. 1000 kg B. 56 kg

C. 44 kg D. 100 kg

3. 2 g oxygen contains number of atoms equal to that in

A. 0.5 g of hydrogen B. 4 g of sulphur

C. 7 g of nitrogen D. 2.3 g of sodium

4. If N_A is Avogardro’s number, then number of electrons in 4.2 g of nitride

ions N^3- is

A. 2.4 N_A B. 4.2 N_A

C. 1.6 N_A D. 3.2 N_A

5. The maximum amount of BaSO₄ precipitated on mixing BaCl₂ (0.5 M) with

H₂SO₄ (1M) will correspond to

A. 0.5 M B. 1.0 M

C. 1.5 M D. 2.0 M

6. Assuming full decomposition, the volume of CO₂ released at STP on heating

9.85 g of BaCO₃ (At. Mass Ba = 137) will be

A. 0.84 L B. 0.24 L

C. 4.06 L D. 1.12 L

7. The volume of water to be added to 100 cm3 of 0.5N, H2SO4 to get decinormal

concentration is

A. 400 cm³ B. 500 cm³

C. 450 cm³ D. 100 cm³

8. The modern atomic weight scale is based on

A. C¹² B. O¹⁶

C. H¹ D. C¹³

9. What volume of hydrogen gas at 273 K and 1 atm. Pressure will be consumed in obtaining 21.6 g of elemental boron (Atomic mass = 10.8) from the reduction of boron trichloride by hydrogen?

A. 89.6 L B. 67.2 L

C. 44.8 L D. 22.4 L

10. Mole of oxygen atom in 9 g of Mg(NO₃)₂

A. 2.6 B. 0.63

C. 0.36 D. 7.2

11. If 30 mL of H₂ and 20 mL of O₂ reacts to form water, what is left at the end of the

reaction?

A. 10 mL of H₂ B. 5 mL of H₂

C. 10 mL of O₂ D. 5 mL of O₂

12. An alkaloid contains 17.28% of nitrogen and its molecular mass is 162. The

Number of nitrogen atoms present in one molecule of alkaloid is;

A. five B. four

C. three D. two

13. Which of the following is mono isotopic element

A. Bromine B. Oxygen

C. Chlorine D. Arsenic

14. The volume in liters of CO₂ liberated at STP when 10 grams of 90% pure

limestone is heated completely is

A. 22.4 B. 2.24

C. 20.16 D. 2.016

15. Heamoglobin contains _____ atoms

A. 68000 B. 10000

C. 6800 D. 1000

16. A compound contains

A. different atoms chemically combine together

B. same atoms chemically combined together

C. all of these D. none of the above

17. Which of the following contain more number

A. 4 gm H₂ B. 10 gm CaCO₃

C. 40 gm NaOH D. 8 g O₂

18. Which of the following contains the same number of atoms as 12 g of

Magnesium?

A. 12 g of carbon B. 20 g of calcium

C. 24 g of carbon D. 12 g of sodium

19. Weight of single molecule of carbon dioxide is

A. 44 g B. 7.305 x 10^-23 g

C. 6.023 x 10²⁴ g D. 4.184 x 10^-22 g

20. Calculate the percentage of oxygen in heavy water

A. 80 % B. 60 %

C. 50 % D. 20 %

21. A compound was found to contain 50 % of ‘X’ (Mol.wt = 10) and 50% of ‘Y’

(Mol.wt = 20). The empirical formula of compound is

A. XY B. XY₂

C. X₂Y D. X₂Y₃

22. The standard used for all atomic, molecular and formula weight of atom, olecule

and formula unit respectively is

A. C¹⁴ B. H¹

C. C¹² D. O¹⁶

23. How many gm of CaCl₂ does it take to produce 14.3 g of AgCl, when treated with

excess AgNO₃ and Ca(NO₃) is the other product

A. 55.7 g Cacl₂ B. 1.54 g CaCl₂

C. 14.2 g Cacl₂ D. 5.57 g CaCl₂

24. How many cubic centimeters are there in litre?

A. 1 cm³ B. 10²cm³

C. 10³ cm³ D. 10cm³

25. When 220 K converts into Centigrade Scale, its value is

A. 225⁰C B. 53⁰C

C. -53⁰C D. -212⁰C

26. The temperature of dry ice is -109⁰F. Is this higher or lower than the temperature

of boiling ethane which is -88⁰C

A. Higher B. Lower

C. Remains same D. Non of these

27. Temperature of 300 K is equal in Celsuis scale is

A. 25⁰C B. 27⁰C

C. 48⁰C D. 32⁰C

28. The empirical formula of glucose is

A. C₆H₁₂O₆ B. C₃H₆O₃

C. CH₂O D. CHO

29. 15 Litres of hydrogen combine with nitrogen to produce ammonia. The volume of ammonia in litres formed is

A. 10 litres B. 5 litres

C. 8 litres D. 12 litres

30. The empirical formula of sulphuric acid is

A. HSO B. HSO₄

C. H₂SO₄ D. H₂SO₂

31. Al³⁺ is a symbol for aluminium

A. atom B. ion

C. cation D. anion

32. Which one of the following statements is not correct?

A. a molecule is the smallest particle of an element which can exist independently

B. He is a molecule of helium

C. S₈ is a molecule of sulphur

D. O₃ is a molecule of oxygen

33. The empirical formula of a compound is CH₂O. What may be the compound?

A. C₂H₅OH B. C₆H₅OH

C. HCOOH D. CHOH

││

CHOH

34. The relative abundance of the ions with a definite m/e value is measured by

A. high pressure of vapours B. Strength of electric current measured

C. quantity of fast moving electrons

D. electron gas

35. Which one of the following compounds does not have the empirical formula

CH₂O?

A. ethanoic acid, CH₃CO₂H B. ethanol, CH₃CH₂OH

C. glucose, C₆H₁₂O₆ D. methanal, HCHO

36. 3.01 x 10²² Ag⁺ ions is present in

A. 85 grams AgNO₃ B. 0.85 g AgNO₃

C. 8.5 g AgNO₃ D. 18.5 g AgNO₃

37. 4.6 grams of C₂H₅OH and 6 grams of C₂H₆ have

A. equal number of molecules

B. C₂H₅OH has greater number of molecules

C. C₂H₆ has greater number of molecules

D. C₂H₆ has less mass of carbon

38. A compound X contains 50% sulphur and 50% oxygen by mass. What is the

empirical (simplest) formula of compound X?

A. SO B. SO₂

C. SO₃ D. SO₄

39. Ethanol burns in O2 completely according to the reaction.

C₂H₅OH + 3O₂ → 2CO₂ + 3H₂O

The mass of O₂ needed to burn 0.1 mole of C₂H₅OH is

A. 32 g B. 3.2 g

C. 5.6 g D. 9.6 g

40. Methane reacts with steam to form hydrogen and carbon monoxide as shown

below

CH₄ + H₂O → 3H₂ + CO

What volume of hydrogen can be obtained from 100 cm3 of methane (at the same

temperature and pressure)?

A. 300 cm³ B. 200 cm³

C. 150 cm³ D. 100 cm³

41. In reaction CH₄ + 2O₂ → CO₂ + 2H₂O.

8 grams of complete burning of CH₄ gives 18 grams CO₂. the percentage yield is

A. 84.84 % B. 89.89 %

C. 81.81 % D. 90.90 %

42. In the reaction

2N₂H₄ + N₂O₄ → 3N₂ + 4H₂O 100 grams of each reactant is combined

together, then

A. N₂H₄ is limiting reactant B. N₂H₄ is not limiting reactant

C. reactants are completely converted to the products D. reactions is reversible

43. The phenomenon of isotropy was first discovered by

A. Soddy B. Rutherford

C. Bohr D. Dalton

44. The atomic mass of an element is expressed in

A. gram B. ounce

C. kilogram D. a.m.u.

45. The atomic mass of sodium is

A. 27 amu B. 30 amu

C. 23 amu D. 25 amu

46. Mass of oxygen needed to react with 27g aluminium to form Al₂O₃ according to

the equation

2Al +3/2O₂ → Al₂O₃ is

A. 8 g B. 16 g

C. 32 g D. 24 g

47. Which one of the following has mono atomic molecule?

A. water B. milk

C. ozone D. helium

48. A chemical formula based on an actual molecule is called

A. empirical formula B. structure fofmula

C. molecular formula D. simples formula

49. When NH3 gas reacts with HCl white fumes are formed which are chemically

A. NH⁺₄ B. NH₄Cl

C. HCl fumes D. Cl^-

50. When carbon dioxide passes through lime water, Ca(OH)2 aqueous solution,

white precipitates is formed. It is

A. CaO B. CaCO₃

C. H₂CO₃ D. Ca₂CO₃

ANSWERS

(BASIC CONCEPTS)

1	A	2	D	3	B
4	A	5	A	6	D
7	A	8	A	9	B
10	C	11	D	12	D
13	D	14	D	15	B
16	A	17	A	18	B
19	B	20	A	21	C
22	C	23	D	24	C
25	C	26	A	27	B
28	C	29	A	30	C
31	C	32	D	33	D
34	B	35	B	36	C
37	C	38	B	39	D
40	A	41	C	42	A
43	A	44	D	45	C
46	D	47	D	48	C
49	B	50	B

Best Regards :

Zohaib HassanTrainee Geological EngineerGRC Private LimitedKarora Hydropower Project Besham KPK,PakistanCell#+923318601240Email:Zohaibhani@gmail.com

EmoticonEmoticon

Subscribe to: Post Comments (Atom)