NAT II Biological Science Chemistry With Answers

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NAT II Biological Science Chemistry

Sr. # Questions Answers Choice
1 Chile salt petre is NaNO<sub>3</sub> Na<sub>2</sub>SO4 KNO<sub>3</sub> Na<sub>2</sub>S<sub>2</sub>O<sub>3</sub>
2 Causticisation process is used for the preparation of Caustic soda Caustic potash Baryata solution Slaked lime
3 Which of the following imparts violet colouration to non-luiminous flame of Bunsen burner? NaCl<sub>2</sub> BaCl<sub>2</sub> CaCl<sub>2</sub> KCl
4 Leblanc process is employed in the manufacture of Baking soda Washing soda Potash Plaster of paris
5 Potassium is kept in Water Ammonia Alcohol Kerosene.
6 Which of the following does not reflect the periodicity of elements? Bonding begaviour Electronegativity Ionisation potential Neutron/proton ratio
7 Which of the following has greatest tendency to lose electron? F Fr S Be
8 Which of the following elements is most electronegative? Oxygen Chlorine Nitrogen Fuorine
9 The alkali metal which is liquid at 15°C is K Cs Na None
10 Which of the following pairs are chemically dissimilar? Na and K Ba and Sr Zr and Hf Ca and Zn
11 Variable valency is generally exhibited by Normal elements Transition elements Metallic elements None of these.
12 Which has largest first ionization energy? Li Na K Rb
13 Number of elements present in the fifth period of periodic table is 8 10 18 32
14 Which of the following statements is most appropriate about effective nuclear charge? It depends upon The shielding constant The atomic number The charge on the nucleus Both the nuclear charge and the shielding
15 Which of the following represents elements in order of increasing atomic size? I, Br, Cl Na, Mg, C C, N, O Li, Na, K
16 Which of the following statement regarding catalyst is not true? A catalyst remains unchanged in composition and quantity at the end of the reaction A catalyst can initiate a reaction A catalyst dose not alter the equilibrium in a reversible reaction Catalysts are sometimes very specific in respect of reaction.
17 A zero order reaction is one whose rate is independent of Temperature of the reaction The concentration of the reactants The concentration of the products The material of the vessel in which the reaction is carried out
18 The dimension of rate constant of second order reaction involves Neither time nor concentration Only time Time and concentration Time and square of concentration
19 The rate at which a substance reacts depends on its Atomic weight Equivalent weight Molecular weight Active mass
20 The rate of a reaction that does not involves gases, does not depend upon Pressure Temperature Concentration Catalyst
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