Which of the following metals is used in Space Crafts to withstand high temperatures ? (1) Fe (2) Ti (3) Ni (4) Pb

Which of the following metals is used in Space Crafts to withstand high temperatures ? (1) Fe (2) Ti (3) Ni (4) Pb
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Ti
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Which of the following metals is used in Space Crafts to withstand high temperatures? (1) Fe (2) Ti (3) Ni (4) Pb

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.

Maraging steels derive their strength from the following mechanism: (A) A fine, highly dislocated and strong martensite (B) Fine dispersions of inter-metallic of Fe, Ni, Ti etc (C) Fine dispersions of alloy carbides in a ferrite matrix (D) Fine dispersions of Fe3 C nucleated on dislocations in austenite

Description : Maraging steels derive their strength from the following mechanism: (A) A fine, highly dislocated and strong martensite (B) Fine dispersions of inter-metallic of Fe, Ni, Ti etc (C) Fine ... alloy carbides in a ferrite matrix (D) Fine dispersions of Fe3 C nucleated on dislocations in austenite

Last Answer : Option A

(4) Liquid Hydrogen + Liquid Oxygen Explanation: LOX and liquid hydrogen, used in the Space Shuttle orbiter, the Centaur upper stage of the Atlas V, Saturn V upper stages, the newer Delta IV rocket, the H-IIA rocket, and most stages of the European Ariane rockets. Liquid fueled rocicets have higher specific impulse than solid rockets and are capable of being throttled, shut down, and restarted. Only the combustion chamber of a liquid fueled rocket needs to withstand high combustion pressures and temperatures and they can be regeneratively cooled by the liquid propellant.

Description : (4) Liquid Hydrogen + Liquid Oxygen Explanation: LOX and liquid hydrogen, used in the Space Shuttle orbiter, the Centaur upper stage of the Atlas V, Saturn V upper stages, the ... to withstand high combustion pressures and temperatures and they can be regeneratively cooled by the liquid propellant.

Last Answer : The BOD values of water indicate the (1) amount of organic debris (2) amount of oxygen used for biochemical oxidation (3) amount of oxygen used for biochemical reduction (4) amount of ozone used for biochemical oxidation

How many of the following metals can be extracted buy carbon reduction method ? Na,Al,Mg,Sn,Fe,Pb,Zn,Ca

Description : How many of the following metals can be extracted buy carbon reduction method ? Na,Al,Mg,Sn,Fe,Pb,Zn,Ca

Last Answer : How many of the following metals can be extracted buy carbon reduction method ? Na,Al,Mg,Sn,Fe,Pb,Zn,Ca

Among the metals Na,Mg ,Al,Zn,Cu,Sn ,Fe and Pb number of metals that can be ectreated by the eletroysis ,even from aqueos solution,is………………….

Description : Among the metals Na,Mg ,Al,Zn,Cu,Sn ,Fe and Pb number of metals that can be ectreated by the eletroysis ,even from aqueos solution,is………………….

Last Answer : Among the metals Na,Mg ,Al,Zn,Cu,Sn ,Fe and Pb number of metals that can be ectreated by the eletroysis ,even from aqueos solution,is………………….

Number of metals among following which are obatained by electromentallurgy in molten state are Li, Ba, Na,Al, Fe, Cu, Pb, Sn, Ag, Zn, Ca, Mg.

Description : Number of metals among following which are obatained by electromentallurgy in molten state are Li, Ba, Na,Al, Fe, Cu, Pb, Sn, Ag, Zn, Ca, Mg.

Last Answer : Number of metals among following which are obatained by electromentallurgy in molten state are Li, Ba, Na,Al, Fe, Cu, Pb, Sn, Ag, Zn, Ca, Mg.

Which one of the following statements is not correct? Vulcanisation of rubber makes it - (1) soft and flexible (2) strong and hard (3) chemical resistant (4) withstand higher temperatures

Description : Which one of the following statements is not correct? Vulcanisation of rubber makes it - (1) soft and flexible (2) strong and hard (3) chemical resistant (4) withstand higher temperatures

Last Answer : (1) soft and flexible Explanation: In order to give more strength and more elasticity, natural rubber is heated with sulphur or sulphur compounds at 150°C temperature. Vulcanized rubber has good ... of vulcanized rubber is enhanced up to 100°C. It has good resistance to organic solvents.

Which one of the following statements is not correct? Vulcanisation of rubber makes it (1) soft and flexible (2) strong and hard (3) chemical resistant (4) withstand higher temperatures

Description : Which one of the following statements is not correct? Vulcanisation of rubber makes it (1) soft and flexible (2) strong and hard (3) chemical resistant (4) withstand higher temperatures

Last Answer : soft and flexible

The metal that is used as a catalyst in the hydrogenation of oils is - (1) Pb (2) Ni (3) Cu (4) Pt

Description : The metal that is used as a catalyst in the hydrogenation of oils is - (1) Pb (2) Ni (3) Cu (4) Pt

Last Answer : (2) Ni Explanation: The catalyst used in hydrogenation of oils is nickel. It is used to speed up the reaction.

Which of the following statements is correct? (a) Sporopollenin can be degraded by enzymes. (b) Sporopollenin is made up of inorganic materials. (c) Sporopollenin can withstand high temperatures as well as strong acids and alkalis. (d) Sporopollenin can withstand high temperatures but not strong acids.

Description : Which of the following statements is correct? (a) Sporopollenin can be degraded by enzymes. (b) Sporopollenin is made up of inorganic materials. (c) Sporopollenin can withstand high temperatures ... strong acids and alkalis. (d) Sporopollenin can withstand high temperatures but not strong acids.

Last Answer : (c) Sporopollenin can withstand high temperatures as well as strong acids and alkalis

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 or hissing in the ears after exposure. y) a temporary loss of hearing, especially of upper frequencies. z) abdominal discomfort from low frequency noise.

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.

Ceramic remunerators can withstand temperatures up to: a) 600 oC b) 1300 oC c) 1700oC d) 950oC

Description : Ceramic remunerators can withstand temperatures up to: a) 600 oC b) 1300 oC c) 1700oC d) 950oC

Last Answer : 1300 oC

Newlands' table, the elements were placed with the halogens - (1) Mn and As (2) Fe and Se (3) Ce and La (4) Co and Ni

Description : Newlands' table, the elements were placed with the halogens - (1) Mn and As (2) Fe and Se (3) Ce and La (4) Co and Ni

Last Answer : (4) Co and Ni Explanation: Newlands' Law of Octaves suffered from lot of limitations, In order to fit elements into his table, Newlands ad justed two elements in the same slot, but also put some unlike elements under the same note.

A complex compound in which the oxidation number of a metal is zero is - (1) K4 [Fe (CN)6] (2) K3 [Fe (CN)6] (3) [Ni (CO)4] (4) [Pl (NH3)4]Cl2

Description : A complex compound in which the oxidation number of a metal is zero is - (1) K4 [Fe (CN)6] (2) K3 [Fe (CN)6] (3) [Ni (CO)4] (4) [Pl (NH3)4]Cl2

Last Answer : (3) [Ni (CO)4]

The catalyst used in hydrogenation of oils is - (1) Fe (2) V2O5 (3) Ni (4) O2

Description : The catalyst used in hydrogenation of oils is - (1) Fe (2) V2O5 (3) Ni (4) O2

Last Answer : (3) Ni Explanation: The catalyst used in hydrogenation of oils is nickel. It is used to speed up the reaction. Vegetable oils convert into vanaspati after hydrogenation.

Which glowing head-Ti, Ni, Chrome to use with electronic cigarettes and why. I have a Joyetech eVic-VTC Mini

Description : Which glowing head-Ti, Ni, Chromium to use with electronic cigarettes and why. I have a Joyetech eVic-VTC Mini. Which glowing head do you recommend and what are the individual Ti, Ni, Chrome heads intended for? Thank you for the explanation.

Last Answer : Need Answer

Amongst `[TiE_(6)]^(2-), [CoF_(6)]^(3-), Cu_(2)Cl_(2)` and `[NiCl_(4)]^(2-)` [Atomic no. `Ti = 22, Co = 27, Cu = 29, Ni = 28`] the colourless species

Description : Amongst `[TiE_(6)]^(2-), [CoF_(6)]^(3-), Cu_(2)Cl_(2)` and `[NiCl_(4)]^(2-)` [Atomic no. `Ti = 22, Co = 27, Cu = 29, Ni = 28`] the colourless species

Last Answer : Amongst `[TiE_(6)]^(2-), [CoF_(6)]^(3-), Cu_(2)Cl_(2)` and `[NiCl_(4)]^(2-)` [Atomic no. `Ti = 22, ... (2)Cl_(2)` D. `TiF_(6)^(2-) and Cu_(2)Cl_(2)`

Which of the following is heaviest metal? Pb, As, Al, Ni -Chemistry 9th

Description : Which of the following is heaviest metal? Pb, As, Al, Ni -Chemistry 9th

Last Answer : lead(pb) hope this helps u

The metal that is used as a catalyst in the hydrogenation of oils is (a) Ni (b) Pb (c) Cu (d) Pt

Description : The metal that is used as a catalyst in the hydrogenation of oils is (a) Ni (b) Pb (c) Cu (d) Pt

Last Answer : Ans:(a)

Cold dil. `H_(2)SO_(4)` will completely dissolve : (i) Pb (ii) `Fe_(3)O_(4)` (iii) Fe (iv) Cu (v) Mg (vi) MgO (vii) `CoCO_(3)` (viii) `CuCO_(2)` (ix)

Description : Cold dil. `H_(2)SO_(4)` will completely dissolve : (i) Pb (ii) `Fe_(3)O_(4)` (iii) Fe (iv) Cu (v) Mg (vi) MgO (vii) `CoCO_(3)` (viii) `CuCO_(2)` (ix)

Last Answer : Cold dil. `H_(2)SO_(4)` will completely dissolve : (i) Pb (ii) `Fe_(3)O_(4)` (iii) Fe (iv) Cu (v) ... ) `CoCO_(3)` (viii) `CuCO_(2)` (ix) `SrCO_(3)`

Cold conc. `HNO_(3)` will completely dissolve: (i) Pb (ii) `Pb_(3)O_(4)` (iii) Fe (iv) Sn (v) Mg (vi) MgO (vii) Hg (viii) Au (ix) Ag (x) Pt

Description : Cold conc. `HNO_(3)` will completely dissolve: (i) Pb (ii) `Pb_(3)O_(4)` (iii) Fe (iv) Sn (v) Mg (vi) MgO (vii) Hg (viii) Au (ix) Ag (x) Pt

Last Answer : Cold conc. `HNO_(3)` will completely dissolve: (i) Pb (ii) `Pb_(3)O_(4)` (iii) Fe (iv) Sn (v) Mg (vi) MgO (vii) Hg (viii) Au (ix) Ag (x) Pt

Cold dil. `H_(2)SO_(4)` will completely dissolve : (i) Pb (ii) `Fe_(3)O_(4)` (iii) Fe (iv) Cu (v) Mg (vi) MgO (vii) `CoCO_(3)` (viii) `CuCO_(2)` (ix)

Description : Cold dil. `H_(2)SO_(4)` will completely dissolve : (i) Pb (ii) `Fe_(3)O_(4)` (iii) Fe (iv) Cu (v) Mg (vi) MgO (vii) `CoCO_(3)` (viii) `CuCO_(2)` (ix)

Last Answer : Cold dil. `H_(2)SO_(4)` will completely dissolve : (i) Pb (ii) `Fe_(3)O_(4)` (iii) Fe (iv) Cu (v) ... ) `CoCO_(3)` (viii) `CuCO_(2)` (ix) `SrCO_(3)`

Cold conc. `HNO_(3)` will completely dissolve: (i) Pb (ii) `Pb_(3)O_(4)` (iii) Fe (iv) Sn (v) Mg (vi) MgO (vii) Hg (viii) Au (ix) Ag (x) Pt

Description : Cold conc. `HNO_(3)` will completely dissolve: (i) Pb (ii) `Pb_(3)O_(4)` (iii) Fe (iv) Sn (v) Mg (vi) MgO (vii) Hg (viii) Au (ix) Ag (x) Pt

Last Answer : Cold conc. `HNO_(3)` will completely dissolve: (i) Pb (ii) `Pb_(3)O_(4)` (iii) Fe (iv) Sn (v) Mg (vi) MgO (vii) Hg (viii) Au (ix) Ag (x) Pt

Among the sulphide oers of Ag,Hg,Pb,Fe Cu anZn how many of them can be extracted by self reduction process.

Description : Among the sulphide oers of Ag,Hg,Pb,Fe Cu anZn how many of them can be extracted by self reduction process.

Last Answer : Among the sulphide oers of Ag,Hg,Pb,Fe Cu anZn how many of them can be extracted by self reduction process.

IN which set do all elements tend to form anions in binary ionic compounds Question 3 options N S I Ca B K K Ga Pb Fe Hg Na?

Description : IN which set do all elements tend to form anions in binary ionic compounds Question 3 options N S I Ca B K K Ga Pb Fe Hg Na?

Last Answer : Need answer

Radioactive materials should be kept in the container made of : (1) Fe (2) Al (3) Pb (4) Steel

Description : Radioactive materials should be kept in the container made of : (1) Fe (2) Al (3) Pb (4) Steel

Last Answer : (4) Steel Explanation: Radioactive materials are first encased in resin or concrete and sealed in steel drums. The drums are then packed into concrete casks and placed in concrete trenches up to 18 metres deep.

Radioactive materials should be kept in the container made of : (1) Fe (2) Al (3) Pb (4) Steel

Description : Radioactive materials should be kept in the container made of : (1) Fe (2) Al (3) Pb (4) Steel

Last Answer : Steel

Transformer cores are normally made from (A) Soft ferrites (B) High purity iron (C) Grain oriented Fe-Si alloy (D) Al-Ni-Co alloy

Description : Transformer cores are normally made from (A) Soft ferrites (B) High purity iron (C) Grain oriented Fe-Si alloy (D) Al-Ni-Co alloy

Last Answer : (C) Grain oriented Fe-Si alloy

Why are Ti+2 and other transition metals and their ions paramagnetic ?

Description : Why are Ti+2 and other transition metals and their ions paramagnetic ?

Last Answer :  Ans: These ions have unpaired electrons in d- subshell. 

Which of the following has highest melting point? Ni, Fe, Pt, W. -Chemistry 9th

Description : Which of the following has highest melting point? Ni, Fe, Pt, W. -Chemistry 9th

Last Answer : i think all are equal

Which one of the following has a square planar geometry? `(Co=27, Ni=28, Fe=26, Pt=78)`

Description : Which one of the following has a square planar geometry? `(Co=27, Ni=28, Fe=26, Pt=78)`

Last Answer : Which one of the following has a square planar geometry? `(Co=27, Ni=28, Fe=26, Pt=78)` A. `[NiCl_(4)]^(2-) ... `[CoCl_(4)]^(2-)` D. `[FeCl_(4)]^(2-)`

The correct statement (s) regarding the binary transition metal carbonyl compounds is (are) (Atomic numbers: Fe = 26, Ni = 28)

Description : The correct statement (s) regarding the binary transition metal carbonyl compounds is (are) (Atomic numbers: Fe = 26, Ni = 28)

Last Answer : The correct statement (s) regarding the binary transition metal carbonyl compounds is (are) (Atomic ... the oxidation state of the metal is increased

Among the following complexes : `K_(3)[Fe(CN)_(6)],[Co(NH_(3))_(6)]Cl_(3)` , `Na_(3)[Co ( o x )_(3)],[Ni(H_(2)O)_(6)]Cl_(2)`, `K_(2)[Pt(CN)_(4)]` and

Description : Among the following complexes : `K_(3)[Fe(CN)_(6)],[Co(NH_(3))_(6)]Cl_(3)` , `Na_(3)[Co ( o x )_(3)],[Ni(H_(2)O)_(6)]Cl_(2)`, `K_(2)[Pt(CN)_(4)]` and

Last Answer : Among the following complexes : `K_(3)[Fe(CN)_(6)],[Co(NH_(3))_(6)]Cl_(3)` , `Na_(3)[Co ( o x )_(3)],[Ni(H_( ... ,M,N B. K,N,O,P C. L,M,O,P D. L,M,N,O

Low pressure Zeigler process for the manufacture of polythene uses a catalyst which is (A) Ni (B) V2O5 (C) Fe (D) Aluminium triethyl combined with titanium tetrachloride

Description : Low pressure Zeigler process for the manufacture of polythene uses a catalyst which is (A) Ni (B) V2O5 (C) Fe (D) Aluminium triethyl combined with titanium tetrachloride

Last Answer : (D) Aluminium triethyl combined with titanium tetrachloride

Constantan is an alloy of (A) Cu (55%) & Sn (45%) (B) Cu (55%) & Ni (45%) (C) Pt (95%) & Rh (10%) (D) Fe (80%) & Ni (20%)

Description : Constantan is an alloy of (A) Cu (55%) & Sn (45%) (B) Cu (55%) & Ni (45%) (C) Pt (95%) & Rh (10%) (D) Fe (80%) & Ni (20%)

Last Answer : (B) Cu (55%) & Ni (45%)

The core metal of chlorophyll is (a) Ni (b) Cu (c) Fe (d) Mg.

Description : The core metal of chlorophyll is (a) Ni (b) Cu (c) Fe (d) Mg.

Last Answer : d) Mg.

The deficiencies of micronutrients, not only affect growth of plants but also vital functions such as photosynthetic and mitochondrial electron flow. Among the list given below, which group of three elements shall affect most, both photosynthetic and mitochondrial electron transport?(a) Co, Ni, Mo (b) Ca, K, Na (c) Mn, Co, Ca (d) Cu, Mn, Fe

Description : The deficiencies of micronutrients, not only affect growth of plants but also vital functions such as photosynthetic and mitochondrial electron flow. Among the list given below, which group of three elements shall affect most, both ... , Mo (b) Ca, K, Na (c) Mn, Co, Ca (d) Cu, Mn, Fe

Last Answer : d) Cu, Mn, Fe

Consider the production of ammonia from methene and air as raw materials. The catalysts used are: (i) __________ for steam reforming of methane and (ii) __________ for ammonia synthesis. (A) (i) - Ni/Al2O3 ; (ii) - Cu - ZnO/Al2O3 (B) (i) - Fe/Al2O3 ; (ii) - Cu - ZnO/Al2O3 (C) (i) - Ni/Al2O3 ; (ii) - Fe/Al2O3 (D) (i) - Fe/Al2O3 ; (ii) - Ni/Al2O3

Description : Consider the production of ammonia from methene and air as raw materials. The catalysts used are: (i) __________ for steam reforming of methane and (ii) __________ for ammonia synthesis. (A) (i) - Ni/Al2O3 ; (ii) - Cu - ZnO/ ... (i) - Ni/Al2O3 ; (ii) - Fe/Al2O3 (D) (i) - Fe/Al2O3 ; (ii) - Ni/Al2O3

Last Answer : (C) (i) - Ni/Al2O3 ; (ii) - Fe/Al2O3

The trace metal present in insulin is (A) Cu (B) Zn (C) Fe (D) Ni

Description : The trace metal present in insulin is (A) Cu (B) Zn (C) Fe (D) Ni

Last Answer : (B) Zn

Which of the following metals are present in hemoglobin and chlorophyll, respectively? (1) Fe and Mg (2) Fe and Zn (3) Mg and Zn (4) Zn and Mg

Description : Which of the following metals are present in hemoglobin and chlorophyll, respectively? (1) Fe and Mg (2) Fe and Zn (3) Mg and Zn (4) Zn and Mg

Last Answer : (1) Fe and Mg Explanation: Fe and Mg metals are present in hemoglobin and Chlorophyll respectively.

Among the metals Ti,V,W,Zr th and Au the number of metals purified van arkel method are…….

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…….

Leaching can be used for the extraction of which metals (i) Pb (ii) Al (iii) Ag (iv) Au

Description : Leaching can be used for the extraction of which metals (i) Pb (ii) Al (iii) Ag (iv) Au

Last Answer : Leaching can be used for the extraction of which metals (i) Pb (ii) Al (iii) Ag (iv) Au A. (ii) (iii) and ... iii) C. (ii) and (iv) D. (iii) and (iv)

Various fungi are known to accumulate considerable quantities of divalent metals, e.g. (a) Cd (b) Zn (d) All of these (c) Pb

Description : Various fungi are known to accumulate considerable quantities of divalent metals, e.g. (a) Cd (b) Zn (d) All of these (c) Pb

Last Answer : Ans. ((d))

Superconductors are those elements – (1) Whose conductivity is intermediate between metals and insulators (2) Whose resistance falls almost to zero at very low temperature (3) Which conduct electricity only at super-high temperature (4) Which conduct electricity only, at super-high temperatures

Description : Superconductors are those elements – (1) Whose conductivity is intermediate between metals and insulators (2) Whose resistance falls almost to zero at very low temperature (3) Which conduct electricity only at super-high temperature (4) Which conduct electricity only, at super-high temperatures

Last Answer : (2) Whose resistance falls almost to zero at very low temperature Explanation: Superconductivity is a phenomenon of exactly zero electrical resistance and expulsion of magnetic fields occurring in ... lines from the interior of the superconductor as it transitions into the superconducting state.

Superconductors are those elements (1) Whose conductivity is intermediate between metals and insulators (2) Whose resistance falls almost to zero at very low temperatures (3) which turn into insulators at very low temperatures (4) which conduct electricity only at super-high temperatures

Description : Superconductors are those elements (1) Whose conductivity is intermediate between metals and insulators (2) Whose resistance falls almost to zero at very low temperatures (3) which turn into insulators at very low temperatures (4) which conduct electricity only at super-high temperatures

Last Answer : Whose resistance falls almost to zero at very low temperatures

Do you think that with all the space crafts going up into space is damaging the ozone?

Description : Do you think that with all the space crafts going up into space is damaging the ozone?

Last Answer : I don’t think it works like that. The ozone layer is gas. It’s not like a balloon where the rockets are punching wholes in it. It’s more like a submarine in the ocean. As it goes down, the water just takes it’s place. Same concept applies here. The gasses don’t stay torn apart.

The metal used for making air crafts and rockets is – (1) Lead (2) Aluminium (3) Nickel (4) Copper

Description : The metal used for making air crafts and rockets is – (1) Lead (2) Aluminium (3) Nickel (4) Copper

Last Answer : (3) Nickel Explanation: Nickel-based super alloys are an unusual class of metallic materials with an exceptional combination of high temperature strength, toughness, and resistance to degradation in ... These materials are widely used in aircraft and power-generation turbines, rocket engines, etc.

Benzene undergoes Friedel-Crafts reaction with isopropyl alcohol in the presence of H2SO4 catalyst to give (a) n-Propylbenzene (b) Benzophenone (c) Isopropylbenzene (d) Nothing happens

Description : Benzene undergoes Friedel-Crafts reaction with isopropyl alcohol in the presence of H2SO4 catalyst to give (a) n-Propylbenzene (b) Benzophenone (c) Isopropylbenzene (d) Nothing happens

Last Answer : Isopropylbenzene

Which of the following reactions can be used to prepare alkanes? (a) Corey-House synthesis (b) Williamson synthesis (c) Friedel-Crafts reactions (d) None of these

Description : Which of the following reactions can be used to prepare alkanes? (a) Corey-House synthesis (b) Williamson synthesis (c) Friedel-Crafts reactions (d) None of these

Last Answer : Corey-House synthesis