Five Year Papers

1.       On passing steam over red-hot coal we get __________.

(Water gas, Ethane, Carbonmonoxide)

2.       ‘d’ and ‘f’ block elements are called __________.

(Heavy metals, Rare elements, Transition elements)

3.       The correct formula of pyrosulphuric acid is __________.

(H₂SO₄, H₂S₂O₇, H₃S₂O₅)

4.       Aqua regia is mixture of one part of __________ by volume and three parts of __________.

(H₂SO₄, H₃PO₄, HNO₃, HCl)

5.       Heavy hydrogen is also called __________.

(Proteum, Deuterium, Hydronium)

6.       When boric acid (H₃BO₃) is heated of 140°C, it forms __________.

(Boric Acid, Pyroboric acid, Metaboric acid)

7.       Photographic film is made of sheets of __________.

(Cellulose Acetate, P.V.A, Nylon)

8.       C₄H₈ is a saturated hydrocarbon because it is __________.

(Cyclic, Open chain, Polymer)

9.       n-Octane is __________ at room temperature.

(Gas, Liquid, Semi-solid)

10.   The compound formed between an element A of group IIIA and an element B of group VIA has the formula __________.

(AB, A₂, B₃, A₂B₃)

11.   The oxide formed by AI is __________.

(Acidic, Amphoteric, Basic)

12.   Bakelite is a polymer of __________ and form aldehyde.

(Ethane, Methanol, Phenol)

13.   The plastics, which can be heated only once, are known as __________ plastics.

(Perspex, Thermoplastic, Thermosetting)

14.   The deficiency of __________ in the human body is the cause of diabetes.

(Insulin, Alamin, Ptyalin)

15.   If the level of cholesterol increases in the blood serum, it causes __________.

(Diabetes,Heart attact, High blood pressure)

16.   The formula of baking soda is __________.

(NaHCO₃, Na₂CO₃, Na₂CO₃10H₂O)

17.   The formula of Plaster of Paris is __________.

(CaSO₄.₂H2O, ₂CaSO₄.H₂O, (CaSO₄)₂H₂O)

18.   The atoms of the elements belonging to the same period of the Periodic table have __________.

(Same number of protons, same number of neutrons, same number of valence shells)

19.   Sodium thiosulphate is used in photography because of its __________.

(Reducing power, Complex formation, Oxidizing behaviour)

20.   The outer electronic configuration of copper is __________.

(4s¹4d¹⁰, 4s²3d¹⁰, 4s¹3d¹⁰)

21.   H₂S solution in water is __________.

(Neutral, Acidic, Basic)

22.   __________ is isomer of ethanol.

(CH₃OH, CH₃OCH₃, C₆H₅OH)

23.   Petroleum is a mixture of __________.

(Alkanes and alkenes, aromatic hydrocarbons, all of these)

24.   Glucose is __________.

(Reducing sugar, oxidizing sugar, none of these)

25.   Pentane shows __________.

(Two isomers, three isomers, four isomers)

Chapter 1

Periodic Classification of Elements

1.      __________ elements have been discovered so far.

(100, 110, 120, 150)

2.      so far 110 elements have been discovered. Out of these __________ elements are naturally occurring.

(100, 96, 92, 94)

3.      __________ classified the then known elements into metals, non metals and their derivatives.

(Dobreiner, Al-Razi, Newlands, Mendeleeve)

4.      In 1817, a German chemist, __________ made use of the idea of relationship between atomic weights and properties of elements for the classification of elements.

(Dobreiner, Al-Razi, Newlands, Mendeleeve)

5.      __________ presented the law of triads.

(Dobreiner, Al-Razi, Newlands, Mendeleeve)

6.      Dobreiner’s work led to the law of triads which states that __________.

(Atomic weight of any one lement was found to be approximately the mean of the other two elements of  triad, Atomic weight of the middle element was found to be approximately the mean of the other two elements of a triad, Atomic number of any one element was found to be approximately the mean of the other two elements of a triad, Atomic number of the middle element was found to be approximately the mean of the other two elements of triad)

7.      The law of octaves was given by __________.

(Dobreiner, Al- Razi, Newlands, None of these)

8.      Law of octaves states that __________.

(The properties of every 6^th element from the given one were similar to the first, the properties of every 9^th element from the given one were similar to the first, the properties of every 8^th element from the given one were similar to the first, the properties of every 7^th element from the given one were similar to the second)

9.      “Physical and chemical properties of elements are periodic functions of their atomic weight.” This is called __________.

(Dobereiner’s Law of Triads, Newlands’ Law of Octaves, Mendeleev’s Periodic Law, None of these)

10.  Lother Meyer arranged the elements in order of their increasing atomic weights and found that __________.

(Physical propertis of the elements were the periodic function of their atomic weights, chemical properties of the elements were the periodic function of their atomic number, physical properties of the elements were the periodic function of their atomic number, chemical properties of the elements were periodic function of their atomic weights)

11.  Mendeleev’s Periodic table was based on __________.

(Atomic number, Atomic mass, Atomic volume, Electronic Configuration)

12.  Mandeleev formulated a rule for the classification of elements and concluded that __________.

(Physical and chemical properties of the elements are periodic functions of their atomic numbers, physical and chemical properties of the elements are periodic functions of their atomic weights, physical properties of the elements are periodic function of their atomic weights, Chemical properties of the elements are periodic functions of their atomic numbers)

13.  Modern Classification of elements is based on __________.

(Doberiner’s law of Triads, Newlands’ law of Octaves, Mendeleev’s Periodic Table, None of these)

14.  Excluding H and He, the smallest element in the periodic table is __________.

(Lithium, Fluorine, Cesium, Iodine)

15.  “Physical and chemical properties of elements are the periodic functions of their atomic numbers.” This is called __________.

(Law of Triads, Law of Octaves, Periodic Law, None of these)

16.  Moseley’s work led to the periodic law, which states that __________.

(the number of the electrons in the 1s energy level increases as the atomic number increases, The properties of the elements are a periodic function of their atomic masses, The x-rays spectra of the elements are more complex than the optical spectra, The properties of elements are the periodic function of their atomic number)

17.  A pair of elements in the same family in the periodic table classification is __________.

(Chlorine and carbon, calcium and aluminium, nitrogen and neon, sodium and potassium)

18.  In the period, the elements are arranged in strict sequence in order of __________.

(Increasing charges in the nucleus, increasing atomic weight, increasing number of electrons in valence shell, increasing valency)

19.  Most of the known elements are metals of __________ of periodic table.

(d-block, p-block, III-group, Zero block)

20.  __________ reflects combining capacity of an element.

(Valency, atomic number, ionization energy, ionization potential)

21.  As we move from left to right in second period of the periodic table, the gram atomic volume of the elements __________.

(Increases at a constant rate, remains unchanged, decreases, will change indefinitely)

22.  The volume in cubic centimeters occupied by one gram atom of the element is called __________.

(Atomic Volume, Atomic weight, Mass number, None of these)

23.  In a __________, atomic volume increases with atomic number, from top to bottom, as new shells are added up with increase in atomic number.

(Group, Period, Sub-group, None of these)

24.  __________ of the following is a transition element.

(Ni, Rb, Al, As)

25.  On moving from left to right across a period in the periodic table, the size of atom generally __________.

(decreases, increases, remains constant, decreases up to IV A group and then increases)

26.  The amount of energy required to remove an electron from an atom of an element in the gaseous state I called __________.

(Ionization Potential, Ionization energy, Electron volt, both a and b)

27.  Each vertical row of the periodic table includes elements with chemical characteristics that are in general __________.

(identical, similar, different, sometimes identical and sometimes differents)

28.  The ionization energy __________ in a group from top to bottom with the increase in atomic size.

(Increases, decreases, remains constant, none of these)

29.  The lowest ionization energies are found in the __________.

(inert gases, alkali metals, Transition elements, Halogens)