Description : Why lime stone is added in the extraction of lead from galena?
Last Answer : Why lime stone is added in the extraction of lead from galena? A. It prevents the formation of ... moves the impurity of iron oxide as fusible slag.
Description : What happens when lime stone is not added during the extraction of iron?
Last Answer : If limestone is not added to charge during the extraction of iron, the blast furnace will get blocked.
Description : State the role of lime stone in the extraction of iron from haematite. Or Why is lime stone added during the extraction of iron?
Last Answer : Limestone reacts with the sand present as impurity in the ore forming calcium silicate which is taken out of the blast furnace as slag.
Description : In the extraction of iron from haematitie, the charge used is haematite, coke and lime stone in the following weight ration
Last Answer : In the extraction of iron from haematitie, the charge used is haematite, coke and lime stone in the following weight ration ... C. `8:1:4` D. `1:4:8`
Description : Which of the following diagram is correctly related to extraction of pb from galena?
Last Answer : Which of the following diagram is correctly related to extraction of pb from galena? A. Galena ... ("Electrolytic ") underset(" reduction")rarrPb`
Description : If the iron ore contains clay as an impurity, the flux added during calcination, is (A) Clay (B) Lime stone (C) Argillaceous iron ore (D) All the above
Last Answer : Answer: Option B
Description : Main source of lead is galena `(PbS)`. It is converted to Pb by `:` Self`-` reduction process is `:`
Last Answer : Main source of lead is galena `(PbS)`. It is converted to Pb by `:` Self`-` reduction process is `:` A. A B. B C. both D. none
Description : Galena (PbS) on heating in limited supply of air gives lead metal. This is known as
Last Answer : Galena (PbS) on heating in limited supply of air gives lead metal. This is known as A. ... B. Calcination C. Self reduction D. Sulphatizing roasting
Description : Which of the following is also known as 'Galena'? (1) Lead sulphate (2) Lead oxide (3) Lead sulphide (4) Calcium sulphate
Last Answer : (3) Lead sulphide Explanation: Galena, also called lead glance, is the natural mineral form of lead sulfide. It is the most important ore of lead and an important source of silver.
Description : The most important ore of lead is – (1) Galena (2) Magnetite (3) Pyrolusite (4) Siderite
Last Answer : (1) Galena Explanation: Galena is the natural mineral form of lead sulfide. It is the most important lead ore mineral. Galena is one of the most abundant and widely distributed sulfide minerals.
Description : __________ is an ore of lead. (A) Quartz (B) Galena (C) Siderite (D) Chalcopyrite
Last Answer : (B) Galena
Description : Which of the following minerals is a source of lead? w) Bauxite x) Hematite y) Malachite z) Galena
Last Answer : ANSWER: Z -- GALENA
Description : Galena is a primary ore of which of the following metals? w) zinc x) tungsten y) lead z) silver
Last Answer : ANSWER: Y -- LEAD
Description : The most important ore of lead is (1) Galena (2) Magnetite (3) Pyrolusite (4) Siderite
Last Answer : Galena
Description : Galena is a mineral of (1) iron (2) gold (3) lead (4) calcium
Last Answer : lead
Description : Which plain formed due to the weathering of lime stone? -Do You Know?
Last Answer : answer:
Description : In conversion of lime-stone to lime, `CaCO_(3(s)) to CaO_((s)) + CO_(2(g))` the values of `DeltaH^@` and `DeltaS^@` are `+179.1 kJmol^(-1)` and `160.2
Last Answer : In conversion of lime-stone to lime, `CaCO_(3(s)) to CaO_((s)) + CO_(2(g))` the values of `DeltaH^@` and ... : A. 1008 K B. 1200 K C. 845 K D. 1118 K
Description : Lime stone, Sand stone and Dolomite are
Last Answer : Ans. Sedimentary rocks
Description : Which mineral is mostly found in northern and western mountains of Pakistan? A. Chromite B. Lime-stone C. China Clay D. Gypsum
Last Answer : ANSWER: B
Description : Hyderabad has deposits of _____. A. Chromite B. Gypsum C. Fire Clay D. Lime-stone
Last Answer : ANSWER: D
Description : Minerals Hyderabad has deposits of _____. A. Chromite B. Gypsum C. Fire Clay D. Lime-stone
Description : What is used in making of alloys? A. Lime-stone B. Chromium C. Granite D. Gypsum
Description : Which plain formed due to the weathering of lime stone?
Last Answer : Karst plains
Description : The gas let out when the: lime stone is heated?
Last Answer : Carbon dioxide
Description : The product obtained when lime stone is heated?
Last Answer : Quicklime and Carbondioxide
Description : What is used in making of alloys? A. Gypsum B. Granite C. Chromium (Answer) D. Lime-stone
Last Answer : C. Chromium (Answer)
Description : Which stone floats on water? A. Pumice stone (Answer) B. Lime stone C. Basalt stone D. Quartzite stone
Last Answer : A. Pumice stone (Answer)
Description : Out of the following substances, one ton of __________ will store the maximum heat for a rise of 30°C in temperature. (A) Steel (B) Lignite (C) Water (D) Lime stone
Last Answer : (C) Water
Description : Pavement is said to be flexible if it contains (A) Water bound macadam surface (B) Stabilised soil base constructed of lime cement or tar (C) Bitumen-bound stone layer of varying aggregates (D) All the above
Last Answer : Answer: Option D
Description : The commonly used material in the manufacture of cement is (A) Sand stone (B) Slate (C) Lime stone (D) Graphite
Last Answer : (C) Lime stone
Description : The rock which is not calcareous, is: (A) Lime stone (B) Chalk (C) Laterite (D) None of these
Last Answer : (D) None of these
Description : Ordinary Portland cement is manufactured from (A) Lime stone and clay (B) Gypsum and lime (C) Pozzolana (D) Lime, pozzolana and clay
Description : The commonly used raw material in the manufacture of cement, is (A) Slate (B) Sand stone (C) Lime stone (D) Basalt
Last Answer : Answer: Option C
Description : Dolomite is a lime stone which contains carbonate of magnesia upto (A) 15 % (B) 20 % (C) 25 % (D) 45 %
Description : If the ore impurities is (A) Clay, lime stone is used as flux (B) Lime stone, clay is used as flux (C) Quartz, lime stone and argillaceous iron ores are used as flux (D) All the above
Description : Lime stone is not a (A) Sedimentary rock (B) Stratified rock (C) Aqueous rock (D) Metamorphic rock
Description : Plaster of Paris is obtained by calcining (A) Bauxite (B) Gypsum (C) Lime stone (D) None of these
Description : Quick lime (or caustic lime) (A) Is obtained by the calcination of pure lime stone (B) Has great affinity to moisture (C) Is amorphous (D) All the above
Description : Which of the following metamorphic rocks has the most weather resisting characteristics? (A) Marble (B) Quartzite (C) Slate (D) Lime stone
Description : Three basic raw materials which are needed in large quantities for production of steel are (A) Iron ore, coal and sulphur (B) Iron ore, carbon and sulphur (C) Iron ore, coal and lime stone (D) Iron ore, carbon and lime stone
Description : Slate is formed by metamorphic action on (A) Shale (B) Lime stone (C) Sand stone (D) Granite
Last Answer : Answer: Option A
Description : Pick up the correct statement from the following: (A) The free quartz suddenly expands at a temperature lower than 600°C (B) The lime stone resists fire upto about 800°C and at higher temperature it splits into ... (C) The sand stone with silicates resist a fire in a better way (D) All the above
Description : Which of the following sedimentary rocks changes into quartzite by metamorphic action? (A) Sand stone (B) Lime stone (C) Shale (D) Gypsum
Description : Which of the following stone is best suited for construction of piers and abutments of a railway bridge? (A) Granite (B) Sand stone (C) Lime stone (D) Quartze
Description : Hydraulic lime is obtained by (A) Burning of lime stone (B) Burning of kankar (C) Adding water to quick lime (D) Calcination of pure clay
Description : Which of the following pairs gives a correct combination of the useful and harmful constituents respectively of a good brick earth? (A) Lime stone and alumina (B) Silica and alkalies (C) Alumina and iron (D) Alkalies and magnesium
Description : Pick up the correct statement from the following: (A) Quick lime is obtained by burning pure lime stone (B) Hydraulic lime is obtained by burning lime stone containing clay 5% to 30% (C) Poor lime is obtained by burning lime stone containing impurities more than 5% (D) All the above
Description : Which of the following has more fire resisting characteristics? (A) Marble (B) Lime stone (C) Compact sand stone (D) Granite