Structure of atom Quiz

Structure of atom

Quiz

 

1. Who discovered the electron?
   1.   Rutherford
   2.   Chadwick
   3.   Thomson
   4.   Goldstein
2. . Why was the Thomson’s Model of an atom failed?
   i. It could not explain the screening of negative charges from that of positive
   ii. It did not tell about the presence of electrons
   iii. It did not give an idea about the discrete energy levels
   iv. It explained the atom as a whole to be electrically neutral
   Choose the correct option from the following:
   1.   Only (iii)
   2.   Both (i) & (iii)
   3.   Only (i)
   4.   Both (ii) & (iv)
3. In an alpha scattering experiment, few alpha particles rebounded because
   1.   Most of the space in the atom is occupied
   2.   Positive charge of the atoms very little space
   3.   The mass of the atom is concentrated in the centre
   4.   All the positive charge and mass of the atom is concentrated in small volume
4. What was the source of alpha particles in Rutherford scattering experiment?
   1.   Hydrogen nucleus
   2.   Argon nucleus
   3.   Helium nucleus
   4.   None of these
5. An alpha particle contains
   1.   4 positive charge and 2 mass unit
   2.   2 positive charge and 4 mass unit
   3.   2 positive charge and 2 mass unit
   4.   4 positive charge and 4 mass unit
6. The nucleons are
   1.   Protons and electrons
   2.   Neutrons and electrons
   3.   Protons and neutrons
   4.   None of these
7. Rutherford’s ‘alpha (α) particles scattering experiment’ resulted in the discovery of
   1.   electron
      (b)
      (c)
      (d)
   2.   proton
   3.   nucleus in the atom
   4.   atomic mass
8. Which of the following correctly represents the electronic distribution in the Mg atom?
   1.   3, 8, 1
   2.   2, 8, 2
   3.   1, 8, 3
   4.   8, 2, 2
9. The isotope deuterium of hydrogen has
   1.   No neutrons and one proton
   2.   One neutrons and two protons
   3.   One electron and two neutron
   4.   One proton and one neutron
10. The electrons present in the outermost shell are called
    1.   Valency electrons
    2.   Octate electrons
    3.   Duplet electrons
    4.   Valence electrons
11. The atomic number of sodium is 11 and its mass number is 23. It has
    1.   11 neutrons and 12 protons
    2.   12 protons and 11 electrons
    3.   11 electrons and 12 neutrons
    4.   12 electrons and 11 neutrons
12. The electronic configuration of chlorine is
    1.   2,7
    2.   2,8,8,7
    3.   2,8,7
    4.   2,7,8
13. The isotope used to remove the brain tumours and treatment of cancer is
    1.   U-235
    2.   Na-24
    3.   Iodine-131
    4.   Co-60
14. Which of the following are true for an element?
    (i) Atomic number = number of protons + number of electrons
    (ii) Mass number = number of protons + number of neutrons
    (iii) Atomic mass = number of protons = number of neutrons
    (iv) Atomic number = number of protons = number of electrons
    1.   (i) and (ii)
    2.   (i) and (iii)
    3.   (ii) and (iii)
    4.   (ii) and (iv)
15. The ion of an element has 3 positive charges. Mass number of the atom is 27 and the number of neutrons is 14. What is the number of electrons in the ion?
    1.   13
    2.   10
    3.   14
    4.   16
16. The first model of an atom was given by
    1.   N. Bohr
    2.   E. Goldstein
    3.   Rutherford
    4.   J.J. Thomson
17. An atom with 3 protons and 4 neutrons will have a valency of
    1.   3
    2.   7
    3.   1
    4.   4
18. The ------------ is the sum of the number of protons and neutrons in an atom.
    1.   Isobar
    2.   Atomic mass number
    3.   isotone
    4.   Atomic number
19. How many electrons are present in M-shell of an element with atomic number 20?
    1.   5
    2.   8
    3.   12
    4.   18
20. Which scientist gave the concept of fixed energy levels around the nucleus?
    1.   Ernest Rutherford
    2.   Neils Bohr
    3.   J.J.Thomsan
    4.   None of these
21. What prevents an atom from being collapsed?
    1.   The nuclear forces
    2.   Movement of electrons in discrete energy levels
    3.   The electron-electron repulsions
    4.   All of these
22. Which of the following is an incorrect statement in reference with observation in Rutherford’s α-particle scattering experiment?
    1.   Some of the α-particles rebound after hitting the gold foil (a few α-particles)
    2.   Some of the particles deflected from their path
    3.   Some of the particles not pass through the gold foil
    4.   Most of the particles pass straight through the gold foil
23. Why do most of the elements try to participate in the chemical combinations?
    i. To gain more electrons
    ii. To achieve Inert Gas configuration
    iii. To complete their octet
    iv. To complete their inner shells
    Choose the correct option among the following
    1.   Both (i) & (iii)
    2.   Both (ii) & (iii)
    3.   Only (ii)
    4.   Both (i) & (iv)
24. An alpha particle is also known as:
    1.   subatomic particle
    2.   an unionised helium atom
    3.   a neutral particle
    4.   a doubly (+)ve charged helium ion
25. Which of the following isotope is used in the treatment of blood cancer?
    1.   P-32
    2.   I-131
    3.   Co-60
    4.   any of these
26. Isobars do not differ in the number of
    1.   protons
    2.   electrons
    3.   neutrons
    4.   nucleons
27. Cathode rays consist of negatively charged particles known as ………………
    1.   Electrons
    2.   protons
    3.   Neutrons
    4.   None of these
28. Canal rays consist of negatively charged particles known as ………………
    1.   Electrons
    2.   Protons
    3.   Neutrons
    4.   Neutrino
29. ……………. are the atoms containing same number of neutrons.
    1.   isotones
    2.   Isobars
    3.   isotopes
    4.   None of these
30. The maximum number of electrons in a shell is given by ……………..
    1.   2n²
    2.   n²
    3.   3n²
    4.   4n²
31. Neutrons were discovered by …………….
    1.   Ernest Rutherford
    2.   Neils Bohar
    3.   J.J.Thomsan
    4.   James Chadwick
32. -------------used for treatment of Goitre disease.
    1.   Co-60
    2.   I-131
    3.   U-235
    4.   P-34

Acids,bases and salts Quiz-1

Acids, bases and salts

Quiz

 

1. What happens when a solution of an acid is mixed with a solution of a base in a test tube?
   (i) Temperature of the solution decreases
   (ii) Temperature of the solution increases
   (in) Temperature of the solution remains the same
   (iv) Salt formation takes place
   1.   (i) and (iv)
   2.   (i) and (iii)
   3.   (ii) only
   4.   (ii) and (iv)
2. Which one of the following salts does not con-tain water of crystallisation?
   1.   Blue vitriol
   2.   Baking soda
   3.   Washing soda
   4.   Gypsum
3. In terms of acidic strength, which one of the following is in the correct increasing order?
   1.   Water < Acetic acid < Hydrochloric acid
   2.   Water < Hydrochloric acid < Acetic acid
   3.   Acetic acid < Water < Hydrochloric acid
   4.   Hydrochloric acid < Water < Acetic acid
4. Tomato is a natural source of which acid?
   1.   Acetic acid
   2.   Citric acid
   3.   Tartaric acid
   4.   Oxalic acid
5. Brine is an
   1.   aqueous solution of sodium hydroxide
   2.   aqueous solution of sodium carbonate
   3.   aqueous solution of sodium chloride
   4.   aqueous solution of sodium bicarbonate
6. Na2CO3 . 10H2O is
   1.   washing soda
   2.   baking soda
   3.   bleaching powder
   4.   tartaric acid
7. At what temperature is gypsum heated to form Plaster of Paris?
   1.   90°C
   2.   100°C
   3.   110°C
   4.   120°C
8. Sodium carbonate is a basic salt because it is a salt of a
   1.   strong acid and strong base
   2.   weak acid and weak base
   3.   strong acid and weak base
   4.   weak acid and strong base
9. Alkalis are
   1.   acids, which are soluble in water
   2.   acids, which are insoluble in water
   3.   bases, which are insoluble in water
   4.   bases, which are soluble in water
10. Which of the following statements is correct about an aqueous solution of an acid and of a base?
    (i) Higher the pH, stronger the acid
    (ii) Higher the pH, weaker the acid
    (in) Lower the pH, stronger the base
    (iv) Lower the pH, weaker the base
    1.   (i) and (iii)
    2.   (ii) and (iii)
    3.   (i) and (iv)
    4.   (ii) and (iv)
11. Lime water reacts with chlorine to give
    1.   bleaching powder
    2.   baking powder
    3.   baking soda
    4.   washing soda
12. Nettle sting is a natural source of which acid?
    1.   MetiWanoic acid
    2.   Lactic acid
    3.   Citric acid
    4.   Tartaric acid
13. An aqueous solution turns red litmus solution blue, Excess addition of which of the following solution would reverse the change?
    1.   Baking poder
    2.   Lime
    3.   Ammonium hydroxide solution
    4.   Hydrochlororic acid
14. Calcium phosphate is present in tooth enamel. its nature is-
    1.   Basic
    2.   Acidic
    3.   Neutral
    4.   Amphoteric
15. What is the pH range of our body?
    1.   7.0 – 7.8
    2.   7.2 – 8.0
    3.   7.0 – 8.4
    4.   7.2 – 8.4
16. Rain is called acid rain when its:
    1.   pH falls below 7
    2.   pH falls below 6
    3.   pH falls below 5.6
    4.   pH is above 7
17. Sodium hydroxide turns phenolphthalein solution
    1.   pink
    2.   yellow
    3.   colourless
    4.   orange
18. Which one of the following can be used as an acid-base indicator by a visually impaired (blind) student?
    1.   Litmus
    2.   Turmeric
    3.   Vanilla essence
    4.   Petunia leaves
19. Sodium carbonate is a basic because
    1.   it is a salt of strong acid and strong base.
    2.   it is a salt of weak acid and strong base.
    3.   it is a salt of Strong acid and weak base.
    4.   it is a salt of weak acid and weak base.
20. Setting of plaster of paris takesplace due to
    1.   Hydration
    2.   dehydration
    3.   Oxidation
    4.   Reduction
21. The odour of acetic acid resembles with
    1.   Rose
    2.   Burning plastics
    3.   burning woods
    4.   Vinegar
22. An aqueous solution with pH=7.2 is
    1.   Acidic
    2.   Basic
    3.   Amphoteric
    4.   None of these
23. Plaster of paris is harden by
    1.   Giving off carbon-dioxide
    2.   combining with water
    3.   Giving out water
    4.   none of these
24. Dry HCl does not change the colour of litmus paper. Which is the correct answer ?
    1.   The colour of litmus paper changes only in the presence of ions like hydrogen (H+) or hydronium (H3O+) ions only.
    2.   dry HCL is not dissociated into any ion only.
    3.   Both (A) and (B) are the reasons
    4.   None of these
25. Some fruits like mango, lemon, raw grapes, orange, etc., have a sour taste due to the presence of:
    1.   Acetic acid
    2.   Citric acid
    3.   Lactic acid
    4.   Oxalic acid
26. Zinc granules on treating with an acid X, form the zinc sulphate (ZnSO4) salt along with the evolution of a gas Y which burns with a pop sound when brought near to a burning candle. Identify the acid X and gas evolved Y.
    1.   X- Sulphuric acid and Y- Oxygen gas
    2.   X- Hydrochloric acid and Y- Oxygen gas
    3.   X- Sulphuric acid and Y- Hydrogen gas
    4.   X- Hydrochloric acid and Y- Hydrogen gas
27. Which of the following indicators turn red in an acidic solution?
    i. Phenolphthalein
    ii. Litmus
    iii. Turmeric
    iv. Methyl orange
    Choose the correct option:
    1.   (i) and (ii)
    2.   (ii) and (iii)
    3.   Only (ii)
    4.   (ii) and (iv)
28. Dilute acid does not produce carbon dioxide on being treated with:
    1.   Marble
    2.   Lime
    3.   Baking soda
    4.   Limestone
29. The sample of soil from a particular place was tested for its pH value. It came out to be 5. Which one of the following should be added to the soil to make it suitable for the plant growth?
    i. Calcium chloride
    ii. Calcium Hydroxide
    iii. Calcium oxide
    Choose the correct option:
    1.   Both (i) and (ii)
    2.   Both (ii) and (iii)
    3.   Only (i)
    4.   Only (iii)
30. An ant’s sting can be treated with …………which will neutralise the effect of the chemical injected by the ant’s sting into our skin.
    Choose the correct option from the following to be filled in the blank space:
    1.   Methanoic acid
    2.   formic acid
    3.   Baking soda
    4.   Caustic soda
31. Bleaching powder is used as a disinfectant for water to:
    1.   Make water tastier
    2.   Remove all the dirt from water
    3.   Make water germ-free
    4.   Make water clear
32. Copper sulphate crystals when heated strongly, lose their water of crystallization to give anhydrous copper sulphate accompanied by a change in color from:
    1.   Blue to green
    2.   Blue to white
    3.   Blue to sky blue
    4.   Blue to grey
33. In the following reaction, identify the salt formed
    NH4OH (aq) + H2SO4 (aq) → _____ + 2H2O (l)
    1.   NH4NO3
    2.   (NH4)2SO4
    3.   (NH4)3PO4
    4.   (NH4)2S