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 : 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
Last Answer : Answer: Option D
Description : The angle of contact in case of a liquid depends upon (A) The nature of the liquid and the solid (B) The material which exists above the free surface of the liquid (C) Both of die above (D) Any one of the above
Last Answer : Answer: Option C
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
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 : What has to happen for Condensation to occur in nature air must be cooled to its dew point and there must be some kind of solid surface present true or false?
Last Answer : 1
Description : When water vapours are passed over aluminium carbide, what do we get? -Do You Know?
Last Answer : 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 : When water vapours are passed over aluminium carbide, what do we get?
Last Answer : Methane
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 : The vapour pressure of deliquescent substance is less or more than that of water vapours in air ?
Last Answer : Ans. Less than that of water vapours in air.
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 : Which substance is found in nature in solid , liquid , gaseous state ?
Last Answer : Water is hard , liquid , gaseous in nature.
Description : Pick out the correct statement. (A) Plastics are good conductors of heat and electricity (B) All the polymers are highly crystalline in nature (C) Polymers can be vaporised by heating to ... D) The liquid polymer becomes greasy, then waxy and finally solid on increasing the degree of polymerisation
Last Answer : (D) The liquid polymer becomes greasy, then waxy and finally solid on increasing the degree of polymerisation
Description : Ionic reactions occur in (A) Solid state only (B) Liquid state only (C) Solutions (D) Any state
Last Answer : (C) Solutions
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 : 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 : 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 : A decrease in water content results in a reduction of the volume of a soil in (A) Liquid state (B) Plastic state (C) Semi solid state (D) All of these
Last Answer : (D) All of these
Description : The water content in a soil sample when it continues to loose weight without loosing the volume, is called (A) Shrinkage limit (B) Plastic limit (C) Liquid limit (D) Semi-solid limit
Description : If the natural water content of soil mass lies between its liquid limit and plastic limit, the soil mass is said to be in (A) Liquid state (B) Plastic state (C) Semisolid state (D) Solid state
Last Answer : Answer: Option B
Description : Plasticity index is defined as the range of water content between (A) Liquid and plastic limit (B) Plastic limit and semi solid limit (C) Semi-solid limit and liquid limit (D) Liquid limit and solid limit
Description : (4) Water drops in a dispersion medium of air Explanation: A colloid is a substance microscopically dispersed evenly throughout another substance. A colloidal system consists of two separate phases: a dispersed ... or gas. Cloud is a colloidal dispersion of Water drops in a dispersion medium of air.
Last Answer : Conduction band electrons have more mobility than holes because they – (1) are lighter (2) experience collision less frequently (3) have negative charge (4) need less energy to move them
Description : (2) Fat is dispersed in water Explanation: A colloid is a substance microscopically dispersed evenly throughout another substance. A colloidal system consists of two separate phases: a dispersed ... Milk is an emulsified colloid of liquid butterfat globules dispersed within a water-based solution.
Last Answer : The presence of ozone in the stratosphere is responsible for – (1) increasing the average global temperature in recent years (2) higher rate of photosynthesis (3) checking the penetration of ultra-violet rays to the earth (4) supplying oxygen for people travelling in jets
Description : A liquid would wet the solid, if adhesion forces as compared to cohesion forces are (A) Less (B) More (C) Equal (D) Less at low temperature and more at high temperature
Description : Capillary action is due to the (A) Surface tension (B) Cohesion of the liquid (C) Adhesion of the liquid molecules and the molecules on the surface of a solid (D) All of the above
Description : Fuels that may classified conveniently in solid, liquid and gaseous. a. Unleaded fuel b. Diesel fuel c. Fossil fuel d. All of the above
Last Answer : Fossil fuel
Description : Though liquid in nature, don't push me too far; for then I will break, and the damage may scar.What am I? -Riddles
Last Answer : Glass.
Description : Dynamic friction as compared to static friction is (A) Same (B) More (C) Less (D) May be less of more depending on nature of surfaces and velocity
Last Answer : (C) Less
Description : Consider the following statements regarding Coulomb's theory of earth pressure: 1. It is based on wedge theory of earth pressure. 2. It assumes the wall surface to be rough. 3. It may or may not satisfy the static equilibrium condition ... 1, 2 & 3 (b) 1 & 2 only (c) 2 & 3 only (d) 1 & 3 only
Last Answer : (b) 1 & 2 only
Description : A critical hydraulic gradient may occur when (A) Flow is in upward direction (B) Seepage pressure is in upward direction (C) Effective pressure is zero (D) All the above
Description : The zone in which transverse bending is likely to occur may be obtained by drawing a line from the (A) 30° (B) 45° (C) 60° (D) None of these
Description : Can fresh water occur as a gasliquidor solid?
Last Answer : Yes. As a gas, it is called water vapor, and is invisible.As a liquid, it is called water, and as a solid, it is calledice.
Description : Explain how the adsorption of gas on solid varies with : a. nature of adsorbate and adsorbent
Last Answer : Explain how the adsorption of gas on solid varies with : a. nature of adsorbate and adsorbent b. surface area of adsorbent
Description : The vapour pressure exerted by the moisture contained in a wet solid depends upon the (A) Nature of the moisture (B) Temperature (C) Nature of the solid (D) All (A), (B) and (C)
Last Answer : (D) All (A), (B) and (C)
Description : In case of a super-cooled solution, which is on the verge of crystallisation, the free energy of the solution as compared to that of the solid is (A) More (B) Less (C) Same (D) More or less; depends on the nature of solution
Last Answer : (A) More
Description : Which of the following terms refers to lung tissue that has become more solid in nature due to a collapse of alveoli or infectious process? a) Consolidation Consolidation occurs during an ... chronic infection. d) Empyema Empyema refers to accumulation of purulent material in the pleural space.
Last Answer : a) Consolidation Consolidation occurs during an infectious process such as pneumonia.
Description : . Photo-chemical reactions occur in presence of (A) Sunlight (B) Darkness (C) Solid catalysts (D) Monochromatic radiation only
Last Answer : (A) Sunlight
Description : Which element that does not occur in nature but can be produced artificially? -General Knowledge
Last Answer : The answer is 'Plutonium '
Description : Consider the following statements. 1. Ozone is an allotropic form of oxygen 2. Phosphorus is present in DNA and RNA 3. Halogens occur in free state in nature. 4. The compounds of chlorine are used as cooling agents. The correct statements are: (a) 1 and 4 (b) 2 and 4 (c) 3 and 4 (d) 1 and 2
Last Answer : Ans:(d)
Description : An element that does not occur in nature but can be produced artificially is – (1) thorium (2) radium (3) plutonium (4) uranium
Last Answer : (3) plutonium
Description : As which one of the following, does carbon occur in its purest form in nature? (1) Carbon black (2) Graphite (3) Diamond (4) Coal
Last Answer : (3) Diamond Explanation: The purest form of carbon is neither diamond nor graphene or graphite . It is 'Fullerene' , the purest form of carbon.
Description : Which element that does not occur in nature but can be produced artificially?
Last Answer : Plutonium