Description : Pick out the wrong statement. (A) 'Green acid' is the other name of phosphoric acid produced by the reaction of phosphate rock & sulphuric acid (B) Chemically unreactive nature of ... in the manufacture of safety matches, is converted into white phosphorous by vaporisation followed by condensation
Last Answer : (C) Red phosphorous is the most reactive allotropic form of phosphorous
Description : The most reactive allotropic form of phosphorus is __________ phosphorus. (A) Red (B) Yellow (C) Violet (D) Black
Last Answer : (B) Yellow
Description : Pick out the wrong statement. (A) Yellow phosphorous which is the most reactive allotropic form of phosphorous is transported under water (B) Apatite is the principal material present in ... fixation means the process of bringing atmospheric nitrogen into combination i.e. into nitrogen compound fo
Last Answer : (C) Urea is more hygroscopic than ammonium nitrate
Description : Allotropic modifications of phosphorus include each of the following EXCEPT: w) red phosphorus x) black phosphorus y) white phosphorus z) green phosphorus
Last Answer : ANSWER: Z -- GREEN PHOSPHORUS
Description : Which allotropic form of sulphur is most stable at room temperature?
Last Answer : Which allotropic form of sulphur is most stable at room temperature? A. Rhombic B. Monoclinic C. Plastic D. Colloidal
Description : Conversion of yellow phosphorous to red phosphorous is done by heating it in covered retorts at __________ °C in absence of air. (A) 50-80 (B) 250-400 (C) 1000-1200 (D) 800-900
Last Answer : (B) 250-400
Description : Conversion of yellow phosphorus to red phosphorous is done in retorts at 250-450°C in the (A) Presence of an inert atmosphere (B) Presence of a reducing atmosphere (C) Absence of air (D) Presence of an oxidising atmosphere
Last Answer : (C) Absence of air
Description : Tanks used for the storage of petroleum products (which are inflammable) should be painted with a __________ paint. (A) Black (B) White (C) Red (D) Yellow
Last Answer : (B) White
Description : Both white phosphorous as well as red phosphorous (A) Are soluble in CS2 (B) Burns when heated in air (C) Reacts with hot caustic soda solution to give Phosphine (D) All (A), (B), and (C)
Last Answer : (B) Burns when heated in air
Description : Red phosphorous is changed into white phosphorous by (A) Heating in presence of light (B) Melting under pressure (C) Vaporisation followed by condensation (D) None of these
Last Answer : (C) Vaporisation followed by condensation
Description : Explain how yellow phosphorous is converted into red phosphorus.
Last Answer : Conversion of Yellow Phosphorous to Red phosphorous Yellow phosphorus is converted into red phosphorous in covered retorts containing a reflux condenser to retain any evolved phosphorous vapors. The vessel is gradually ... as reaction is exothermic. Reaction P4 (Yellow) + heating = P4 (Red)
Description : Define red and yellow phosphorous.
Last Answer : Yellow Phosphorous Phosphorus is a chemical element with symbol P and atomic number 15 with selfimagination property when exposed to air. Red Phosphorous Phosphorus is a chemical element with symbol P and atomic number 15
Description : Heat evolved/absorbed during conversion of a substance from one allotropic form to another is termed as the heat of (A) Fusion (B) Vaporisation (C) Transition (D) None of these
Last Answer : (C) Transition
Description : Absorption/evolution of heat during conversion of a substance from one allotropic form to another is termed as the heat of (A) Sublimation (B) Fusion (C) Transition (D) Vaporisation
Last Answer : C) Transition
Description : Pick out the wrong statement. (A) Tin can be readily and very easily drawn into very fine wire (B) Tin can be severely cold worked without the necessity of annealing due to its low recrystallisation temperature (C) Tin exists in two allotropic forms
Last Answer : (A) Tin can be readily and very easily drawn into very fine wire
Description : Titanium metal (A) Exists in three allotropic forms (B) Cannot be welded (C) Is used in oceanographic and space exploration applications (D) None of these
Last Answer : (C) Is used in oceanographic and space exploration applications
Description : __________ paint has the maximum absorption coefficient. (A) Black (B) Yellow (C) White (D) Grey
Last Answer : (A) Black
Description : Titanium dioxide is a/an __________ colour pigment. (A) White (B) Black (C) Yellow (D) Blue
Last Answer : (A) White
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 : 30%Diamond is an allotropic form of----? Carbon Hydrogen Nitrogen Silicon
Last Answer : Silicon
Description : Natalie had fourteen balls. Each one color. She alternated the colors each day, there was a blue, pink, purple, green, red, yellow, black, white, orange, turquoise, tan, neon pink, and brown. Each day of the ... the week will she go to Arby's? What ball will she have while she is at Arby's? -Riddles
Last Answer : She will go to Arby's on Monday, for that is the first day of the week and A is the first letter of the alphabet. So on Tuesday she would go to Burger King. On Wednesday she would go to Chick- ... because red is the first color of the rainbow. So on Tuesday she would have a Orange ball. And so on.
Description : The large plates of solar panels are painted _____. A. White B. Yellow C. Black D. Red
Last Answer : ANSWER: C
Description : 23 Which one of the following sets of colour combinations is added in colour vision in TV? A. Red, green and blue B. Orange, black and violet C. White, red and Yellow D. Green, Yellow and Blue
Last Answer : ANSWER: A
Description : What are the primary colours? (a) Blue, green, yellow (b) Yellow, red, blue (c) Red, blue, green (d) Green, white, black
Last Answer : Ans:(b)
Description : Persons who are colour-blind cannot distinguish between – (1) yellow and white (2) green and blue (3) red and green (4) black and yellow
Last Answer : (3) red and green Explanation: A person with colour-blindness has trouble seeing red, green, blue, or mixtures of these colours. The most common type is redgreen colours - blindness, where red and green are as the same colour.
Description : Person who is colorblind cannot distinguish between – (1) Black and yellow (2) Red and green (3) Yellow and white (4) Green and blue
Last Answer : (2) Red and green Explanation: Color blindness is the decreased ability to see color or differences in color. The most common form of colour blindness is known as red/green colour blind-ness and ... red and green hues due to the absence or mutation of the red or green retinal photoreceptors.
Description : What are the primary colors of Pigment? A. White, Black, Blue B. Red, Yellow, Blue (Answer) C. Red, Orange, Blue D. Red, Green, Blue
Last Answer : B. Red, Yellow, Blue (Answer)
Description : What are the primary colors of Light? 33 A. White, Black, Blue B. Red, Yellow, Blue C. Red, Orange, Blue D. Red, Green, Blue (Answer)
Last Answer : D. Red, Green, Blue (Answer)
Description : The large plates of solar pannels are painted? A. Red B. White C. Yellow D. Black (Answer)
Last Answer : D. Black (Answer)
Description : Person who is colourblind cannot distinguish between (1) Black and yellow (2) Red and green (3) Yellow and white (4) Green and blue
Last Answer : Red and green
Description : Which combination of colour is the most convenient during day and night time ? (1) Organe and blue (2) White and black (3) Yellow and blue (4) Red and green
Description : ction of calcium Fluorapatite with sulphuric acid produces (A) Ortho-phosphoric acid (B) Simple superphosphate (C) Triple superphosphate (D) Red phosphorous
Last Answer : (B) Simple superphosphate
Description : Heavy duty bearings are usually made of (A) White metal (B) Phosphorous bronze (C) Monel (D) Zinc
Last Answer : (A) White metal
Description : Bearings subjected to light load are made of (A) White metal (B) Phosphorous bronze (C) Monel (D) Silicon bronze
Last Answer : (B) Phosphorous bronze
Description : Bush bearings are made of (A) Mild steel (B) Phosphorous bronze (C) White metal alloys (D) None of these
Description : Maximum stability of white phosphorous is at (A) Very high pressure (B) Atmospheric pressure (C) Room temperature (D) > 600°C
Last Answer : (D) > 600°C
Description : Reaction of phosphate rock with 98% H2SO4 produces (A) Ortho-phosphoric acid (B) Superphosphate (C) White phosphorous (D) None of these
Last Answer : (A) Ortho-phosphoric acid
Description : White phosphorous is stored under water, because (A) It does not react with water (B) It is poisonous (C) Its kindling temperature in dry air is very low (D) It is unstable
Last Answer : (C) Its kindling temperature in dry air is very low
Description : Which of the following is the most important rubber compounding ingredient which is used to improve wearing qualities of both natural rubber & SBR by imparting toughness? (A) Phosphorous (B) Carbon black (C) Pine oil (D) Rosin
Last Answer : (B) Carbon black
Description : When a single gene controls the expression of more than one character, it is said to be - (1) Heterotrophic (2) Autotrophic (3) Allotropic (4) Pleiotropic
Last Answer : (4) Pleiotropic Explanation: When a single gene has an effect on the expression of two or more phenotypic traits, it is said to have a pleiotropic effect on the traits. For example ... effect on the expression of many secondary sexual traits which are morphological, as well as behavioral.
Description : Name the allotropic forms of carbon
Last Answer : Crystalline carbon – Diamond & graphite Amorphous carbon
Description : The two allotropic forms of silicon are
Last Answer : amorphous and crystalline.
Description : Name the two allotropic forms of silicon.
Last Answer : a) Amorphous silicon b) Crystalline silicon
Description : When a single gene controls the expression of more than one character, it is said to be (1) Heterotrophic (2) Autotrophic (3) Allotropic (4) Pleiotropic
Last Answer : Pleiotropic
Description : On the official flag of Canada, we can see __________ (A) a green birch leaf. (B) a yellow star. (C) a red maple leaf. (D) white stripes.
Last Answer : (C) a red maple leaf.
Description : __________ is added in low carbon steel to raise its yield point. (A) Sulphur (B) Phosphorous (C) Silicon (D) Manganese
Last Answer : (D) Manganese