Description : Among the metals Ti,V,W,Zr th and Au the number of metals purified van arkel method are…….
Last Answer : Among the metals Ti,V,W,Zr th and Au the number of metals purified van arkel method are…….
Description : Assertion : Zirconium can be purificed by Van Arkel method. Reason : `ZrI_(4)` is volatile and decomposed at `1800 K`.
Last Answer : Assertion : Zirconium can be purificed by Van Arkel method. Reason : `ZrI_(4)` is volatile and decomposed at `1800 K`.
Description : Which method of purification is represented by the following equations `Ti +2I_(2) overset(523K)rarr TiI_(4) overset(1700K)rarr Ti +2I_(2)`
Last Answer : Which method of purification is represented by the following equations `Ti +2I_(2) overset(523K)rarr TiI_( ... B. Poling C. Can arkel D. zone refining
Description : Assertion : Nickel can be purified by Mond process. Reason : `Ni(CO)_(4)` is a volatile compound which deomposed at `460K` to give pure `Ni`.
Last Answer : Assertion : Nickel can be purified by Mond process. Reason : `Ni(CO)_(4)` is a volatile compound which deomposed at `460K` to give pure `Ni`.
Description : (4) Decomposition of manganese dioxide Explanation: One of the two chemical methods starts from natural manganese dioxide and converts it using dinitrogen tetroxide and water to manganese nitrate ... 400°C, the salt decomposes, releasing N2O4 and leaving a residue of purified manganese dioxide.
Last Answer : The mass number of a nucleus is - (1) always less than its atomic number (2) the sum of the number of protons and neutrons present in the nucleus (3) always more than the atomic weight (4) a fraction
Description : Van Arkel method of purification of metals involves converting the metal to
Last Answer : Van Arkel method of purification of metals involves converting the metal to A. Volatile ... stable compound D. non-volatile unstable compound
Last Answer : Van Arkel method of purification of metals involves converting the metal to A. Volatile stable ... . Volatile unstable compound D. None of these
Description : Pick out the correct statement. (A) If an insoluble gas is passed through a volatile liquid placed in a perfectly insulated container, the temperature of the liquid will increase (B) A ... compound is defined as the heat of reaction leading to the formation of the compound from its reactants
Last Answer : (D) The heat of formation of a compound is defined as the heat of reaction leading to the formation of the compound from its reactants
Description : Why Li2CO3 decomposes at a lower temperature whereas Na2CO3 at higher temperature ?
Last Answer : Ans.Li2CO3 is a salt of a weak acid (CO2) and a weak base (LiOH). Since the weak base cannot attract CO2 Strongly, therefore, Li2CO3 decomposes at a lower temperature.On the other hand ,NaOH is a Much stronger base than LiOH and hence can attract CO2 more strongly.
Description : During the manufacture of sulphuric acid, the temperature of molten sulphur is not increased beyond 160°C, as (A) It is very corrosive at elevated temperature (B) Its viscosity is not reduced on ... be further reduced) (C) It decomposes on further increasing the temperature (D) None of these
Last Answer : (B) Its viscosity is not reduced on further heating (hence pressure drop on pumping it, cannot be further reduced)
Description : Bonneville, Early Badger, Arkel are the improved varieties of (A) Frenchbean (B) Pea (C) Sunflower (D) Soybean
Last Answer : (B) Pea
Description : Heavy water used in the nuclear reactors to slow down the speed of neutrons is (A) Highly purified water (B) A compound of oxygen and deuterium (C) Water having dissolved salts of heavy metals (D) None of these
Last Answer : (B) A compound of oxygen and deuterium
Description : A liquid with high boiling point decomposes on simple distillation but it can be steam distilled for its purification .Explain how is it possible?
Last Answer : In steam distillation boiling occurs when vapour pressure of organic compound & steam becomes equal to atmospheric pressure. As vapour pressure of water is higher than the organic liquid. ... organic liquid vaporizes at a temperature below its boiling point in steam distillation without decomposing.
Description : Some statement about Ellingham diagram (a) Increase in the slope of the line on +ve side indicates the phase ransformation (b) Metal oxide decomposes
Last Answer : Some statement about Ellingham diagram (a) Increase in the slope of the line on +ve side indicates the phase ... C. Only b and c D. a,b and c
Description : Number of volums of `O_(2)` formed when 3 volumes of Ozone decomposes
Last Answer : Number of volums of `O_(2)` formed when 3 volumes of Ozone decomposes A. 2 B. `4.5` C. 6 D. `1.5`
Description : How do decomposes help recycle minerals and nutrients?
Last Answer : Need answer
Description : What is the relationship between decomposes and plants?
Last Answer : The relationship between decomposers and plants are that decomposers give plants nutrients and minerals.
Description : Calcium carbonate decomposes into calcium oxide & carbon dioxide Her results:Mass of calcium carbonate before heating = 2.00 g Mass of calcium oxide left after heating = 1.12 g work out the mass of carbon dioxide released during the decomposition?
Last Answer : I am not sure of the answer so can someone help me pls
Description : Suggest a method to purify a liquid which decomposes at its boiling point.
Last Answer : The process Distillation under reduced pressure is used to purify a liquid which decomposes at its boiling point.
Description : Iron is not used alone as a catalyst in ammonia synthesis, because (A) Its activity declines rapidly, if heated to above 520°C (B) It decomposes ammonia (C) It gets oxidised above 500°C (D) None of these
Last Answer : (A) Its activity declines rapidly, if heated to above 520°C
Description : What is the unit of the rate constant in a chemical reaction in which 10% of the reactant decomposes in one hour, 20% in two hours, 30% in three hours and so on? (A) Litre/mole.second (B) Moles/litre.second (C) Litre/mole (D) Litre/second
Last Answer : (A) Litre/mole.second
Description : A liquid decomposes by irreversible first order kinetics and the half life period of this reaction is 8 minutes. The time required for 75% conversion of the liquid will be __________ minutes. (A) 4 (B) 8 (C) 12 (D) 16
Last Answer : (D) 16
Description : Decomposition rate of a liquid 'X' which decomposes as per the reaction as shown in the bellow figure is given by: (A) K1 . CX (B) (K1 + K2 + K3 ) CX (C) (K1 + K2 ) CX (D) (K2 + K3 ) CX
Last Answer : (C) (K1 + K2 ) CX
Description : In the extraction of aluminium by Hall-Heroult process purified `Al_(2)O_(3)` is mixed with `CaF_(2)` to
Last Answer : In the extraction of aluminium by Hall-Heroult process purified `Al_(2)O_(3)` is mixed with `CaF_(2)` to A ... ^(3+)` into Al(s)` D. acts as catalyst
Description : Sea water can be purified by the process of
Last Answer : Desalination
Description : Camphor can easily be purified by the process of (a) Sublimation (b) Distillation (c) Crystallisation (d) Sedimentation
Last Answer : Ans:(a)
Description : Sea water can be purified by the process of – (1) distillation (2) evaporation (3) filtration (4) fractional distillation
Last Answer : (1) distillation Explanation: The traditional process used in desalination operations is vacuum distillation- essentially the boiling of water at less than atmospheric pressure and thus a much ... when the vapor pressure equals the ambient pressure and vapor pressure increases with temperature.
Description : Brackish water which contains mostly dissolved salt, can be purified by the __________ process. (A) Reverse osmosis (B) Sand filter (C) Lime soda (D) Permutit
Last Answer : (A) Reverse osmosis
Description : Sea water can be purified by the process of (1) distillation (2) evaporation (3) filtration (4) fractional distillation
Last Answer : distillation
Description : One of the following metals froms a volatile corbony1 compound and this property is taken advantage of its extraction. This metal is
Last Answer : One of the following metals froms a volatile corbony1 compound and this property is taken advantage of its ... . Nickel B. Iron C. Cobalt D. Vanadium
Description : In which of the following method of purification metal is converted to its volatile compound which is decomposed to give pure metal?
Last Answer : In which of the following method of purification metal is converted to its volatile compound ... Heating with iodine C. Liquidation D. Distillation
Description : ti tle: At what temperature does water boil ?
Last Answer : Water boils at a temperature of 100 degrees Celsius.
Description : Rate of low temperature oxidation of coal due to bad storage conditions (A) Decreases with increase in surface area (B) Does not vary with increase in surface area (C) Is more for low volatile ... to high volatile coal (D) Is accelerated by storage in large heaps with small surface to volume ratio
Last Answer : (D) Is accelerated by storage in large heaps with small surface to volume ratio
Description : A coal containing high amount of volatile matter will have (A) Low ignition temperature (B) Very little ash content (C) High fusion point of its ash (D) Low adiabatic flame temperature
Last Answer : (A) Low ignition temperature
Description : Pick out the wrong statement. (A) Pulverised fuel can be completely burnt with less percentage of excess air compared to lump coal (B) Low grade coal can be used, but generally high volatile ... and atmosphere (oxidising or reducing) is easily possible with pulverised fuel firing (D) None of these
Last Answer : (D) None of these
Description : Presence of free moisture in coal during its high temperature carbonisation (A) Reduces the coking time (B) Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls (C) Increases the loss of fine coal dust from the ovens when charging (D) None of these
Last Answer : (B) Protects the volatile products from pyrolysis (cracking) in the presence of hot coke and hot oven walls
Description : Pick out the correct statement. (A) Angle of repose is always greater than the angle of slide (B) A hopper is a small bin with a sloping bottom (C) A silo is a short height ... used as a 'modifying agent' (for activating or depressing the adsorption of filming agents) in froth floatation process
Last Answer : (B) A hopper is a small bin with a sloping bottom
Description : Which of the following metals is used in Space Crafts to withstand high temperatures? (1) Fe (2) Ti (3) Ni (4) Pb
Last Answer : (2) Ti Explanation: Titanium alloy, which has high corrosion resistance, high specific strength, and good heat resistance, is used for different spacecraft parts including outer fuel tank sheathing and wings. It is extremely strong at high temperatures.
Description : One of the potential health effects of exposure to high levels of noise is called tinnitus (pron: ti - NI - tes), which means: w) a permanent loss of hearing. x) a persistent ringing ... ) a temporary loss of hearing, especially of upper frequencies. z) abdominal discomfort from low frequency noise.
Last Answer : ANSWER: X -- A PERSISTENT RINGING OR HISSING IN THE EARS AFTER EXPOSURE.
Description : Which of the following metals is used in Space Crafts to withstand high temperatures ? (1) Fe (2) Ti (3) Ni (4) Pb
Last Answer : Ti
Description : What is the role of purified linseed oil in oil painting?
Last Answer : It makes the paint flow better. It’s the equivalent of using water with watercolors or acrylics.
Description : Mass spectrometry- how to identify if the mass spectrograph of a purified sample is a certain chemical given main mass components?
Last Answer : I really should know how to do that. I’m glad my AP Chem teacher doesn’t Fluther.
Description : How schools in Nazi Germany were 'cleansed' and 'purified'? -History 9th
Last Answer : 1.Jew teachers were removed. 2. Students were separated on the basis of race. 3. Undesirable kids were later removed from the school and killed. 4. School books were re-written. 5. Students were taught to ... join . The 10 year old had to join ‘Jungvolk' and 14 year old ‘Hitler Youth'.
Description : In which plant phytochrome is isolated and purified? -Biology
Last Answer : answer:
Description : Which purified oil does Aviation fuel for jet aeroplanes consist? -General Knowledge
Last Answer : The answer is 'Kerosene'
Description : Sewage water is purified by
Last Answer : Sewage water is purified by A. Microorganisms B. light C. Fishes D. Aquatic plants.
Description : A colloidal solution can be purified by the following method :
Last Answer : A colloidal solution can be purified by the following method : A. dialysis B. peptization C. filtration D. oxidation