Description : What is carborundum? How is it prepared?
Last Answer : Carborundum is chemically silicon carbide. When a mixture of silicon and coke is heated in an electric furnace, silicon carbide is formed.
Description : Carborundum is another name of – (1) Silicon carbide (2) Silicon oxide (3) Calcium carbide (4) Calcium oxide
Last Answer : (1) Silicon carbide Explanation: Silicon carbide, also known as carborundum, is a compound of silicon and carbon with chemical formula SiC. It occurs in nature as the extremely rare mineral moissanite. Silicon carbide powder has been massproduced since 1893 for use as an abrasive.
Description : Which of the following additives are added to plastics to make it impervious to X-rays? (A) Asbestos (B) Barium salt (C) Carborundum (D) Phthalic acid
Last Answer : (B) Barium salt
Description : Hardest material so far found is (A) Diamond (B) Graphite (C) Carborundum (D) Pumice stone
Last Answer : (A) Diamond
Description : The hardest material just prior to diamond in Mho's scale is (A) Topaz (B) Carborundum (C) Corundum (D) Calcite
Last Answer : (C) Corundum
Description : Hardest materials so far found is (A) Diamond (B) Graphite (C) Carborundum (D) Pumice stone
Description : The hardest material just prior to diamond in Mhos scale is (A) Topaz (B) Carborundum (C) Corundum (D) Calcite
Description : The main constituent of carborundum is __________ carbide. (A) Calcium (B) Silicon (C) Boron (D) Aluminium
Last Answer : (B) Silicon
Description : Spark plugs are made of (A) High alumina ceramic (B) Metallic carbides (C) Corundum (D) Carborundum
Last Answer : (A) High alumina ceramic
Description : Out of (a) Graphite and (b) Carborundum which one is harder ?
Last Answer : Carborundum.
Description : Which of the following is not an abrasive material? (A) Bakelite (B) Pumice (C) Corundum (D) Carborundum
Last Answer : (A) Bakelite
Description : Carborundum consists mainly of (A) Bauxite (B) Silicon carbide (C) Boron carbide (D) Calcium carbide
Last Answer : (B) Silicon carbide
Description : Which rotary instrument gives the smoothest enamel cut? a. carborundum stone (green stone) b. aluminum oxide stone (white stone) c. plain fissure bur d. cross-cut fissure bur e. medium diamond bur (great efficiency but roughest cut)
Last Answer : c. plain fissure bur
Description : Carborundum is another name of (1) Silicon carbide (2) Silicon oxide (3) Calcium carbide (4) Calcium oxide
Last Answer : Silicon carbide
Description : Acetic anhydride is prepared in the laboratory by heating sodium acetate with
Last Answer : Acetic anhydride is prepared in the laboratory by heating sodium acetate with A. ethyl chloride B. acetyl chloride C. Conc. `H_(2)SO_(4)` D. zinc dust
Description : `NO_(2)` can be prepared by heating :
Last Answer : `NO_(2)` can be prepared by heating : A. `NH_(4)NO_(3)` B. `NaNO_(3)` C. `Pb(NO_(3))_(2)` D. `KNO_(3)`
Description : `S_(1):(HPO_(3))_(n)` can be prepared by heating phosphorous acid and bromine in a sealed tube. `S_(2)` : dry iodine reacts with ozone and formed yell
Last Answer : `S_(1):(HPO_(3))_(n)` can be prepared by heating phosphorous acid and bromine in a sealed tube. `S_(2)` : ... below 369 K. A. FTF B. TTF C. TTT D. TFF
Description : Forge welding involves heating of parts to elastic stage and joint is prepared by impact force. a) Yes b) No, it is done up to plastic stage c) Heating is done up to boiling point d) None of the listed
Last Answer : b) No, it is done up to plastic stage
Description : Which of the following statements is false about toluene? (a) can be prepared by treating benzene with methyl chloride in the presence of AlCl3. (b) is converted to benzoic acid on refluxing with ... (d) can be nitrated with concentrated nitric acid to give a mixture of ortho and meta nitrotoluene.
Last Answer : can be nitrated with concentrated nitric acid to give a mixture of ortho and meta nitrotoluene
Description : A certain type of mixture is prepared by mixing brand A at Rs. 9/kg with brand B at Rs. 4/kg. If the mixture is worth Rs. 7/kg, how many kgs. of brand A are needed to make 40 kgs. of the mixture?
Last Answer : Answer: Brand A needed is 24 kgs.
Description : Cones are prepared from Options: 1) Milk Sugar 2) Mixture of Glucose and distilled water 3) Mixture of Cane Sugar and Egg albumin 4) Dextrose
Last Answer : Correct Answer: 3) Mixture of Cane Sugar and Egg albumin
Description : A mixture of two organic compound gives red coloured precipitate with cuprous chloride and silver mirror on heating with Zn and `NH_(4)Cl` followed by
Last Answer : A mixture of two organic compound gives red coloured precipitate with cuprous chloride and silver mirror on heating ... mixture contains : A. B. C. D.
Description : Carbylamine test is performed in alcoholic `KOH` by heating a mixture of:
Last Answer : Carbylamine test is performed in alcoholic `KOH` by heating a mixture of: A. chloroform and silver ... amine D. an alkyl cyanide and a primary amine
Description : P is an alcohl which on heating with `Al_(2)O_(3)` forms an alkene Q.Q on ozonolysis produces R and S. When the mixture of R and S is heated with NaOH
Last Answer : P is an alcohl which on heating with `Al_(2)O_(3)` forms an alkene Q.Q on ozonolysis produces R and S. When ... ))overset(|)(C)-CH_(2)-CH=O+CH_(2)=O`
Last Answer : P is an alcohl which on heating with `Al_(2)O_(3)` forms an alkene Q.Q on ozonolysis produces R and S. ... (|)overset(CH_(3))overset(|)(C)-CH=CH_(2)`
Last Answer : P is an alcohl which on heating with `Al_(2)O_(3)` forms an alkene Q.Q on ozonolysis produces R and S. ... (3))overset(|)(CH)-CH_(2)-COCl+CH_(3)MgCl`
Description : Heating mixture of `Cu_(2)O` and `Cu_(2)S` will give
Last Answer : Heating mixture of `Cu_(2)O` and `Cu_(2)S` will give A. `Cu_(2)SO_(3)` B. `CuO+CuS` C. `Cu+SO_(3)` D. `Cu + SO_(2)`
Description : Heating mixture of `Cu_(2)O`and `Cu_(2)S` will give
Last Answer : Heating mixture of `Cu_(2)O`and `Cu_(2)S` will give A. `Cu+SO_(2)` B. `Cu+SO_(3)` C. `CuO+CuS` D. `Cu_(2)SO_(3)`
Description : A mixture of haematite, coke and limestone on heating in blast furnace gives molten iron metal. This is known as
Last Answer : A mixture of haematite, coke and limestone on heating in blast furnace gives molten iron metal. ... Smelting B. Calcination C. Roasting D. Liquition
Description : Cement is formed by strongly heating a mixture of – (1) limestone and graphite (2) limestone and clay (3) chalk and graphite (4) clay and graphite
Last Answer : (2) limestone and clay Explanation: Cement is made by heating limestone (calcium carbonate) with small quantities of other materials (such as clay) to 1450 degree C in a kiln, in a process known as ... , or quicklime, which is then blended with the other materials that have been included in the mix.
Description : Cement is formed by strongly heating a Mixture of –
Last Answer : Lime Stone and clay
Description : Steam distillation is not recommended to be used, if the (A) Azeotropic mixture is to be separated and the final product is miscible with water (B) Liquids decompose, if ... unstable or has the tendency to react with other components associated with it, at the boiling temperature
Last Answer : (A) Azeotropic mixture is to be separated and the final product is miscible with water
Description : Which of the following is not used as a medium for high temperature heating ? (A) Dowtherm (B) Mercury (C) Liquid metal (e.g. molten sodium) (D) Fused salts (e.g., an eutectic mixture of 53% KNO3 , 40% NaNO2and 7% NaNO3 )
Last Answer : (B) Mercury
Description : Heating a mixture of phosphate rock, coke and sand in an electric furnace produces (A) Phosphoric acid (B) Ammonium phosphate (C) Phosphorous (D) Superphosphate
Last Answer : (C) Phosphorous
Description : Propionamide on heating with a mixture of bromine and sodium hydroxide gives (a) Propane (b) Propylamine (c) Propanol (d) Ethylamine
Last Answer : Ethylamine
Description : Carbylamine test involves heating a mixture of (a) alcoholic KOH, methyl iodide, and sodium metal (b) alcoholic KOH, methyl iodide, and primary amine (c) alcoholic KOH, chloroform, and primary amine (d) alcoholic KOH, methyl alcohol, and primary amine
Last Answer : alcoholic KOH, chloroform, and primary amine
Description : Cement is formed by strongly heating a Mixture of
Last Answer : Limestone and clay
Description : Cement is formed by strongly heating a mixture of (1) limestone and graphite (2) limestone and clay (3) chalk and graphite (4) clay and graphite
Last Answer : limestone and clay