Chapter 1 – Multiple Choice Questions

by • 10/09/2013 • GeneralComments (0)365

Multiple Choice Questions:

1.            The basic unit of length in SI system is

(i)           Foot                       (ii)          lnch       (iii)         Mile       (iv)         None of these

2.            Which property indicates the ability of a substance to undergo chemical changes?

(i)           Physical property                            (ii)          Chemical

(iii)         Additive property                           (iv)         None of these

3.            The property of a substance which does not deal with its ability to undergo chemical change is known as.

(i)           Colligate property           (ii)          Additive property

(iii)         Physical property            (iv)         Chemical property

4.            The atoms consist of still smaller particles the most important of which are

(i)           Neutrons             (ii)          Protons                (iii)         Electrons             (iv)         All of the above

5.            According to modern concept ail ordinary matter is composed of extremely tiny entries called

(i)           Molecules           (ii)          Compounds       (iii)         Atoms                   (iv)         Elements

6.            The basic unit of mass in SI system is

(i)           Kilogram             (ii)          Pound                  (iii)         Gram                     (iv)         Milligram

7.            The SI unit volume is

(i)           m2                          (ii)          m1                          (iii)         cm3                                     (iv)         dm3

8.            A decimeter is equal to

(i)           10.4 m                   (ii)          10.2 m                   (iii)         10-1 m                    (iv)         None of these

9.            The volume occupied by 1 Kg by weight of pure water at 3.98oC is called

(i)           One Kg                 (ii)          One Litre             (iii)         One ml                 (iv)         One cm

10.          The atomic mass unit is defined as

(i)           1/12 the mass of C-12                       (ii)          1/10 the mass of C-12

(iii)         1/12 the mass of C-13                       (iv)         None of these

11.          1 a.m.u is equal to

(i)           1.6 10-24 g             (ii)          1.6 10-20 g             (iii)         1.6 10-30 g             (iv)         1.0 10-24 g

12.          The energy expanded when a force of one Newton moves an object one metre in the direction in which the force is applied is called:

(i)           Calorie                 (ii)          B.T.U                      (iii)         Joule                     (iv)         None of these

13.          While multiplying the exponentially expressed numbers, their exponents are:

(i)           Subtracted          (ii)          Multiplied          (iii)         Added                  (iv)         None of these

14.          Vary small and vary large quantities are expressed in terms of:

(i)           Significant Figures                          (ii)          Exponential nation

(iii)         Logarithm                                           (iv)         None of these

 

16.          80635 is also written in exponential forms as

(i)           8. 0635×104         (ii)          0.80635×102        (iii)         8.0635×104          (iv)         8.0635x 10-4

 

17.          49.85 can be round off as:

(i)           49.6                        (ii)          49.5                        (iii)         49.84                     (iv)         49.9

18           870.0 have

(i)           Two significant figures                  (ii)          Three significant figures

(iii)         Four significant figures                 (iv)         Six significant figures

19.          The numbers that indicate confidence in measurement is called

(i)           Precision             (ii)          Accuracy              (iii)         significant figures           (iv)         None of these

20.          The simplest whole number ratio of atoms in the compound called

(i)           Structural Formula          (ii)          Molecular Formula

(iii)         Empirical Formula           (iv)         Dash Formula

21.          A combination of two or more atoms that can exist independently as a separate distinguishable unit is called.

(i) Atom               (ii) Molecule (iii) Ion      (iv) None of these

22.          A chemical based on an actual molecules is called

(i)           Structural Formula                          (ii)          Empirical Formula

(iii)         Molecular Formula                         (iv)         None of these

23.          The empirical formula of glucose is

(i)           C6H12O6                                (ii)          CH2O                     (iii)         C12H12O11                             (iv)         None of these

24.          1 Mole of H2SO4 is

(i) 49.0 g                               (ii)          98.02 g                  (iii)         100g                                       (iv)         50 g

25.          1 mole of 6C12 consists of 6,022 x 1023 atom of carbon and weights

(i)           14.00 g                  (ii)          13.00g                   (iii)         12.00g                                   (iv)         11.00g

26.          The branch of chemistry which deals with the study of relationship between the quantities of reactants and products in a chemical reaction is called

(i)           Stereochemistry              (ii)          Thermo chemistry

(ii)          Stichiometery                   (iv)         Photochemistry

27.          The actual yield is less than the theoretical yield because of

(i)           Side reactions                                                   (ii)          Mechanical loss

(iii)         Reversible nature of the reaction            (iv)         All of these factors

28.          0.00034 has

(i)           Five Signification figures             (ii) Four Signification figures

(iii)         Three Signification figures          (iv) Two Signification figures

29.          Mass of one atom of carbon is

(i) 2x 10 23g (ii) 1.99x 10 “3 g       (iii)1.60 x “4 g (iv) 1.60x 10

30.          An organic compound has molecular weight 180 and empirical formula CH2O. its molecular formula may be

(i)           C2H2O4                  (ii)          C2H2O12                (iii)         C4H12O4                (iv)         C6H12O6

31.          One mole each of sodium and potassium contains

(i)           Equal atoms       (ii)          Equal volumes (iii)         Equal masses     (iv)         None of these

32.          The value of Avogadro’s number is

(i)           6.022 x 1023         (ii)          6.01 x 1024           (iii)         6.022x 1024          (iv)         6. 01 x 1024

33.          One joule is equal to

(i)           1Nm.                     (ii)          1 Nm-1                   (iii)         Nm-1                      (iv) 1 N m-1

34.          The relation between C ° and F ° scales Is

(i)           C ° = 5/9 ( F ° -32)                               (ii)          Co = 9/5 ( Fo -32 )

(iii)         Co =9/5 ( Fo+ 32)                               (iv)         Co =4/9 ( Fo + 32)

35.          What is the mass of 1.5 mole of oxygen molecules?

(i)           16 g                        (ii)          48 g                        (iii)         32 g ‘                      (iv) 8g

36.          The branch of chemistry which deals with the study of nucleus structure and properties is Known.

(i)           Physical Chemistry                         (ii)          Inorganic Chemistry

(iii)         Radiation Chemistry                      (iv)         Nuclear Chemistry

37.          Atoms that have the same atomic number but different mass number are called

(i)           Isotones              (ii)          Isobars                                 (iii)         Isotopes              (iv)         Ismoers

38.          Isomers Atoms that have the same mass number but different atomic numbers are called

(i)           Isotones              (ii)          Isobars                                 (iii)         Isotopes              (iv)         Isomers

39.          Atoms that have same number of neutrons are called

(i)           Isotones              (ii)          Isobars                                 (iii)         Isotopes              (iv)         Isomers

40.          Dissociation of NH3 is a process called:

(i)           Reversible          (ii)          Irreversible        (iii)         One of these     (iv)         Both A & B

41.          Which one of the following compounds               contains the highest percentages by mass of nitrogen?

(i)           NH3                        (ii)          N2H4                      (iii)         NO                         (iv)         NH4

42.          Mass of one mole of chlorine gas is:

(i)           35.5 g                    (ii)          71 g                        (iii)         23 g                        (iv)         20 g

43.          A compound contains 87.5% Si and 12.5% H .What is the empirical formula of compound (Relative atomic masses H= 1 and SI = 28)

(i)           Si Hz                      (ii)          Si H3                       (iii)         Si H4                       (iv)         Si2H6

44.          The equation of burning of hydrogen in oxygen is:

H 2(g) 4 + O 2(g) ßà          2 H2 O (g)

This equation indicates that:

(i)           2 atoms of hydrogen combine with 2 atoms of oxygen

(ii)          2 moles of steam can be produced from 0.5 mole of oxygen

(iii)         2 mole of steam can be produced from 1 mole of oxygen

(iv)         None of these

45.          Formula Wt. of Ca ( N03)2 is:

(i)           70                           (ii)          82                           (iii)         164                         (iv)         150

46.          Number of atoms, molecules, ions in one mole of a substance is called:

(i)           Atomic VVt.                                       (ii)          Avogadro’s number

(iii)         Mole fraction                                    (iv)         None of these

47.          6 g of H2 gas is:

(i)           1 mole                  (ii)          2 mole                  (iii)         3 mole                  (iv)         4 mole

48.          The difference of measured value and actual value is:

(i)           Precision             (ii)          Accuracy              (iii)         Error                      (iv)         None of these

49.          A compound has empirical formula C 3 H 3 O and molecular weight 110 g mol. The actual molecular formula of compound is:

(i)           C3 H3 O (ii)          C6 H6 02                (iii)         C2H2 O   (iv)         C3 H3 03

50.          The reactant that consumed earlier and give least quantity of the product is called:

(i)           Limiting reactant                             (ii)          Reactant

(iii)         Stoichiometry                                   (iv)         None of these

51.          In heterogeneous reaction:

(i)           Reacting species are in same physical state

(ii)          Reacting species are in different physical state

(iii)         Reacting species are in always gaseous state

(iv)         Reacting species are in always crystal state

 

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