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1) In the reaction, Ca + 2H2O = Ca(OH)2 + H2; what volume (c.c.) of hydrogen at STP would be liberated, when 8 gm of calcium reacts with excess water ? (Atomic weight of calcium = 40) ? a. 4480 b. 2240 c. 1120 d. 0.4
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2) Dissolving a solute in a solvent does not change its________________? a. Specific heat b. Vapour pressure c. Viscosity d. None of these
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3) ‘Cox’ chart which is useful in the design of a distillation column (particularly suitable for petroleum hydrocarbons) is a plot of the_____________? a. Temperature vs. log (vapor pressure) b. Vapor pressure vs. log (temperature) c. Log (temperature) vs. log (vapor pressure) d. Vapor pressure vs. temperature
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4) The number of water molecules present in a drop of water weighing 0.018 gm is 6.023 × __________? a. 1026 b. 1023 c. 1020 d. 1019
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5) The amount of Zn (atomic weight = 65) required to form 224 c.c. of H2 at N.T.P. on treatment with dilute H2SO4will be _____________ gm? a. 0.065 b. 0.65 c. 6.5 d. 65
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6) A vapor that exists above its critical temperature is termed as a _____________ vapor? a. Saturated b. Unsaturated c. Gaseous d. Sub-cooled
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7) Pick out the wrong unit conversion of temperature? a. °R = 273 + °F b. Temperature difference of 1°K = 1°C = 9/5°F c. °C = (F- 32) × 0.555 d. °F = (°C + 17.778) × 1.8
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8) Viscosity of 1 centipoise is equal to 1 Centistoke in case of________________? a. Water b. Mercury c. Carbon tetrachloride d. None of these
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9) The heats of vaporisation of CS2, C2H5OH &H2O are 26.8, 38.6 & 40.6 KJ/kg.mole respectively. The order of decreasing inter-molecular forces in these liquids is________________? a. H2O > C2H5OH > CS2 b. CS2 > C2H5OH > H2O c. H2O > CS2 > C2H5OH d. CS2 > H2O > C2H5OH
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10) The gravimetric (i.e., by weight) composition of a vapor saturated gas is independent of the_______________? a. Nature of both the gas & the liquid b. Temperature c. Total pressure d. None of these
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11) Heat of ____________ of a fuel is called its calorific value? a. Formation b. Combustion c. Reaction d. Vaporisation
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12) A solution having a pH value of 5 is less acidic than the one having a pH value of 2 by a factor of ________________? a. 3 b. 100 c. 1000 d. None of these
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13) The heat evolved in the combustion of benzene is represented by the equation: C6H6 + 7.5 O2 = 6CO2 + 3H2O, ΔH = 3264.6 kJ/kg. mole The heat energy change, when 39 gm of C6H6 is burnt in an open container, will be _____________ kJ/kgmole? a. +816.15 b. +1632.3 c. -1632.3 d. -2448.45
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14) A gas at 0°C is cooled at constant pressure until its volume becomes half the original volume. The temperature of the gas at this state will be_______________? a. -136.5°C b. – 136.5°K c. -273°C d. 0°K
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15) One of the specific gravity scales is “Brix” (used specifically for sugar solution). It is defined as ______________? a. Brix = (400/G) – 400 b. Brix = 200 (G-1) c. Brix = 145 – (145/G) d. None of these
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16) With rise in temperature, the heat capacity of a substance___________________? a. Increases b. Decreases c. Remains unchanged d. Either A. or B.; depends on the substance
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17) For a neutral solution (pH = 7), the value of [H+] [OH-] is equal to_________________? a. 0 b. 1 c. < 1 d. > 1
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18) A compound was found having nitrogen and oxygen in the ratio 28 gm and 80 gm respectively. The formula of the compound is_________________? a. N2O4 b. N2O5 c. N2O3 d. None of these
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19) The heat capacity of a solid compound is calculated from the atomic heat capacities of its constituent elements with the help of the___________________? a. Trouton’s rule b. Kopp’s rule c. Antoine equation d. Kistyakowsky equation
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20) A solution with reasonably permanent pH is called a/an _______________ solution? a. Ideal b. Non-ideal c. Buffer d. Colloidal
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