Description : Which of the following can be regarded as gas so that gas laws could be applicable, within the commonly encountered temperature limits. (a) 02, N2, steam, C02 (b) Oz, N2, water vapour (c) S02, NH3, C02, moisture (d) 02, N2, H2, air (e) steam vapours, H2, C02.
Last Answer : Answer : d
Description : Pick up the correct statement from the following: (A) Absolute humidity at a given temperature is equal to weight of moisture present in a unit volume (B) Relative humidity is the ratio of ... of vapours which could be contained at the same temperature when fully saturated (D) All the above
Last Answer : Answer: Option D
Description : Table salt gets moist during rainy season because (1) sodium chloride is hygroscopic (2) sodium chloride is deliquescent (3) sodium chloride contains some quantity of sodium iodide (4) sodium chloride contains hygroscopic impurities like magnesium chloride
Last Answer : sodium chloride contains hygroscopic impurities like magnesium chloride
Description : Moisture in a substance exerting an equilibrium vapour pressure less than that of pure liquid at the same temperature is called the __________ moisture. (A) Bound (B) Unbound (C) Critical (D) None of these
Last Answer : (A) Bound
Description : Metal (M) shows crimson red colour in flame test and its halide is deliquescent then metal (M) could be :
Last Answer : Metal (M) shows crimson red colour in flame test and its halide is deliquescent then metal (M) could be : A. Li B. Mg C. Ca D. Ba
Description : Is magnesium sulphate deliquescent?
Last Answer : Need answer
Description : Smog is a combination of – (1) Air and water vapours (2) Water and smoke (3) Fire and water (4) Smoke and fog
Last Answer : (4) Smoke and fog Explanation: Smog is a type of air pollution; the word "smog" was coined in the early 20th century as a portmanteau of the words smoke and fog to refer to smoky ... amounts of coal within a city; this smog contains soot particulates from smoke, sulfur dioxide and other components.
Description : What type of colloidal sols are formed in the following ? (i) Sulphur vapours are passed through cold water. (ii) White of an egg is mixed with water. (iii) Concentration of soap solution is increased.
Last Answer : (i) Multimolecular colloid (ii) Macromolecular colloid (iii) Associated colloid.
Description : When dry bulb temperature & wet bulb temperature of moist air is the same, it means that the (A) Partial pressure of water vapour is less than the total pressure (B) Humidity is < 100% & dew ... Dew point temperature of air has not reached & air is not saturated fully (D) Air is fully saturated
Last Answer : (D) Air is fully saturated
Description : What is the main product obtained when vapours of t-butyl alcohol are passed over copper at 300° ?
Last Answer : Ans. Isobutylene (2-Methyl propene)
Description : Moisture content of a substance when at equilibrium with a given partial pressure of the vapour is called the __________ moisture. (A) Free (B) Unbound (C) Equilibrium (D) Bound
Last Answer : (C) Equilibrium
Description : What is the most commonly used substance in fluorescent tubes? (1) Sodium oxide and argon (2) Sodium vapour and neon (3) Mercury vapour and argon (4) Mercury oxide and neon
Last Answer : (3) Mercury vapour and argon Explanation: A fluorescent lamp or fluorescent tube is a gas-discharge lamp that uses electricity to excite mercury vapour. it contains mercury vapour and ... A fluorescent lamp converts electrical power into useful light more efficiently than an incandescent lamp.
Last Answer : Mercury vapour and argon
Description : Air is said to be saturated when - (1) it contains maximum content of water vapour (2) its pressure is minimum (3) its thickness is maximum (4) it blows over the barren land
Last Answer : (1) it contains maximum content of water vapour Explanation: When a volume of air at a given temperature holds the maximum amount of water vapour, the air is said to be saturated. Mr is said ... 100 percent or is saturated, moisture will condense, mean-ing the water vapor changes to liquid vapor.
Description : Air is said to be saturated when : (1) it contains maximum content of water vapour (2) its pressure is minimum (3) its thickness is maximum (4) it blows over the barren land
Last Answer : it contains maximum content of water vapour
Description : If the dew point is greater than 0°C (A) Dew will be formed (B) Frost will be formed (C) Vapours will be formed (D) None of these
Last Answer : Answer: Option A
Description : When water vapours are passed over aluminium carbide, what do we get? -Do You Know?
Last Answer : answer:
Description : When water vapours are passed over aluminium carbide, what do we get?
Last Answer : Methane
Description : In nature water may occur as (A) Liquid (B) Solid (C) Vapours (D) All the above
Description : Pick up the correct statement from the following: (A) Rivers, lakes, oceans and springs get water from the rains (B) Rain water is obtained by evaporation from rivers, lakes and oceans (C) Water remains in atmosphere as vapours (D) All the above
Description : When a mixture of solid NaCl, solid `K_(2)Cr_(2)O_(7)` is heated with conc. `H_(2)SO_(4)` orange red vapours are obtained. These are of the compound
Last Answer : When a mixture of solid NaCl, solid `K_(2)Cr_(2)O_(7)` is heated with conc. `H_(2 ... B. chromyl chloride C. chromic chloride D. chromic sulphate
Description : A Unknown salt (S) when heated with dil `H_(2)SO_(4)` does not evolve brown vapours but with conc. `H_(2)SO_(4)` brown vapours are obtained. The vapou
Last Answer : A Unknown salt (S) when heated with dil `H_(2)SO_(4)` does not evolve brown vapours but with conc. `H_(2)SO_(4)` ... 3)^(-)` C. `I^(-)` D. `Br^(-)`
Description : When vapours of an alcohol are passed over hot reduced copper, it gices an alkene. The alcohol is
Last Answer : When vapours of an alcohol are passed over hot reduced copper, it gices an alkene. The alcohol is A. Primary B. Secondary C. Tertiary D. None of these
Description : A safety lamp when inserted in the upper portion of a manhole causes flames. It indicates the presence of A. Carbondioxide gas B. Hydrogen sulphide gas C. Methane gas D. Petrol vapours
Last Answer : ANS: C
Description : Lead acetate test in sewer manhole is done to test the presence of A. Methane gas B. Hydrogen sulphide C. Carbondioxide gas D. Diesel vapours
Last Answer : ANS: B
Description : Give reason: Lead vapours or D.D.T is a non-biodegradable pollutant.
Last Answer : Lead vapours or D.D.T cannot be converted into harmless substance by any known biological activity hence they are referred to as non-biodegradable pollutants.
Description : Why excessive heating and repeated use of cooking oil is most undesirable? (1) The oil vapours can cause indoor pollution (2) Carcinogenic substances like benzpyrene are produced (3) Nutrient value of food is lost (4) Loss and wastage of oil
Last Answer : Carcinogenic substances like benzpyrene are produced
Description : Pick out the wrong statement. (A) Surface tension of a substance vanishes at critical point, as there is no distinction between liquid and vapour phases at its critical point (B) Entropy of ... is negative for exothermic reactions (D) The eccentric factor for all materials is always more than one
Last Answer : (D) The eccentric factor for all materials is always more than one
Description : True vapour pressure of a petroleum fraction __________ Reid vapour pressure. (A) Is less than (B) Is more than (C) Is same as (D) May be either more or less than
Last Answer : (D) May be either more or less than
Description : In Azeotropic mixture, the equilibrium vapour composition is (A) More than liquid composition (B) Less than liquid composition (C) Same as liquid composition (D) Independent of pressure
Last Answer : (C) Same as liquid composition
Description : The siphon will work satisfactorily, if the minimum pressure in the pipe is __________ vapour pressure of liquid. (A) Equal to (B) Less than (C) More than (D) None of these
Last Answer : Answer: Option C
Description : Water always boils when its (A) Temperature reaches 100° C (B) Vapour pressure equals 76 cm of Hg (C) Saturated vapour pressure equals the external pressure on its surface (D) Saturated vapour pressure is less than the atmospheric pressure
Last Answer : (C) Saturated vapour pressure equals the external pressure on its surface
Description : Which one of the following statements is correct ? a) For water at 100o Celsius at sea level, the vapour pressure is equal to atmospheric pressure b) Surface energy (or tension) is caused by ... it both in static and in dynamic conditions d) Air is 50,000 times more compressible than water
Last Answer : c) Viscosity of a fluid is the property exhibited by it both in static and in dynamic conditions
Description : Net positive suction head (NPSH) of a centrifugal pump must be (A) Greater than the vapour pressure of the liquid (B) Less than the vapour pressure of the liquid (C) Equal to the vapour pressure of the liquid (D) Less than barometric pressure
Last Answer : (A) Greater than the vapour pressure of the liquid
Description : Cavitation occurs in a centrifugal pump when the suction pressure is (A) Less than the vapour pressure of the liquid at that temperature (B) Greater than the vapour pressure of the liquid at that temperature (C) Equal to the vapour pressure (D) Equal to the developed head
Last Answer : (A) Less than the vapour pressure of the liquid at that temperature
Description : The vapour pressure over the concave surface is (A) Less man the vapour pressure over the plane surface (B) Equal to the vapour pressure over the plane surface (C) Greater than the vapour pressure over the plane surface (D) Zero
Description : In order to obtain spectrum from the emitted radiation, the atomic gas or vapour must be excited at a) much less than atmospheric pressure b) much high than atmospheric pressure c) atmospheric pressure d) high pressure and temperature
Last Answer : a) much less than atmospheric pressure
Description : i)Vapour pressure increases with increase in temperature. ii)Giycerine is more viscous than water.
Last Answer : Ans. i) At higher temperature inter particle attraction weakens and more number of mole cules escape to vapour. ii) As interparticle forces are stronger in glycerine.
Description : At triple point (for one component system), vapour pressure of solid as compared to that of liquid will be (A) More (B) Less (C) Same (D) More or less; depending on the system
Last Answer : (C) Same
Description : Conversion of a substance directly from solid to vapour state is known as (a) Vaporisation (b) Sublimation (c) Decomposition (d) Ionisation
Last Answer : Ans:(b)
Description : The process of conversion of substance directly from solid to vapour state?
Last Answer : Sublimation
Description : Any substance above its critical temperature exists as (A) Saturated vapour (B) Solid (C) Gas (D) Liquid
Last Answer : (C) Gas
Description : At the critical point of a substance (A) The surface tension vanishes (B) Liquid and vapour have the same density (C) There is no distinction between liquid and vapour phases (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : In case of steam distillation, the steam leaving the liquid is not completely saturated with distillate vapour, because (A) Temperature is less (B) Total pressure is less (C) Mixing of steam ... not so intimate as to result in equilibrium condition (D) Saturated steam is used for steam distillation
Last Answer : (C) Mixing of steam with the material being vaporised is not so intimate as to result in equilibrium condition
Description : Mercury is often used in barometer because (A) It is the best liquid (B) The height of barometer will be less (C) Its vapour pressure is so low that it may be neglected (D) Both (B) and (C)
Description : Choose the wrong statement. Alcohol is used in manometer, because (A) Its vapour pressure is low (B) It provides suitable meniscus for the inclined tube (C) Its density is less (D) It provides longer length for a given pressure difference
Description : The dew point is the: a. Dry bulb temperature on a psychrometer b. Temperature at which water vapour will start to be absorbed into the air c. Temperature below which water vapour will start to ... vapour will start to condense out of the air e. Temperature at which water will start to evaporate
Last Answer : Answer: C
Description : An air-water vapour mixture has a dry bulb temperature of 60°C and a dew point temperature of 40°C. The total pressure is 101.3 kPa and the vapour pressure of water at 40°C and 60°C are 7.30 kPa and 19.91 kPa respectively ... air is: (A) 0.048 (B) 0.079 (C) 0.122 (D) 0.152
Last Answer : (D) 0.152
Description : When an unsaturated air-water mixture is heated at constant pressure, then (A) The partial pressure of water vapour increases (B) The specific humidity decreases (C) The relative humidity increases (D) The relative humidity decreases
Last Answer : D) The relative humidity decreases
Description : 5. In "Imperial Smelting Process" for extraction of zinc, zinc vapour thus produced is quenched in the external condenser by the use of the following: (A) Jet of water at high pressure (B) Blast of air (C) Mixture of water and air (D) Rain of molten lead
Last Answer : Option D