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.
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
Description : Brass is an alloy of : (1) Cu, Al and Zn (2) Cu and Sn (3) Cu and Zn (4) Al and Mg
Last Answer : (3) Cu and Zn Explanation: Brass is an alloy made of copper and zinc. The proportions of zinc and copper can be varied to cre-ate a range of brasses with varying properties. By comparison, bronze is principally an alloy of copper and tin.
Last Answer : Cu and Zn
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
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)`
Description : Soils with high pH are generally deficient in:? a Zn and Mn b B and Fe c Cu and Mo d Ca and Mg
Last Answer : a Zn and Mn
Description : Hot dipping process is used for coating a low melting point metal (e.g. Pb, Sn, Zn) on iron, steel & copper having relatively higher melting points. Which of the following is not a hot dipping process? (A) Galvanising (B) Tinning (C) Sherardizing (D) None of these
Last Answer : (C) Sherardizing
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.
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.
Description : German Silver is an alloy of------? A. Zn + Ni B. Cu + Zn C. Cu + Ni (Answer) D. Cu + Sn E. None of these
Last Answer : C. Cu + Ni (Answer)
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%)
Description : Identify the type of reaction(s) in the following equations. (i)CH4 + 2O2 CO2 + 2 H2O (ii) Pb(NO3)2 + 2KI ——–>Pbl2 + 2KNOs (iii) CaO + H2O ——–> Ca(OH)2 (iv) CuSO4 + Zn ——–> ZnSO4 + Cu -Chemistry
Last Answer : Answer. (i) Combustion reaction and oxidation reaction. (ii)Double displacement reaction and precipitation reaction. (iii) Combination reaction. (iv) Displacement reaction.
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
Description : Gray spots of oat are caused by deficiency of (a) Cu (b) Zn (c) Mn (d) Fe.
Last Answer : (c) Mn
Description : The trace metal present in insulin is (A) Cu (B) Zn (C) Fe (D) Ni
Last Answer : (B) Zn
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))
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
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.
Last Answer : Steel
Description : Citrate is converted to isocitrate by aconitase which contains (A) Ca++ (B) Fe++ (C) Zn++ (D) Mg++
Last Answer : B
Description : Which of the following is an electrolytic cell A. lron * (ll) * (Fe) oxidized, aluminum (Al) reduced O B. Silver (Ag) oxidized, gold (Au) reduced C. Aluminum () oxidized (Zn) reduced LithiumD. (Li) oxidized, (Zn) reduced?
Last Answer : The answer is not c.
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 : 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 : A cofactor required for the activity of the enzyme ALA dehydratase is (A) Cu (B) Mn (C) Mg (D) Fe
Last Answer : Answer : A
Description : The core metal of chlorophyll is (a) Ni (b) Cu (c) Fe (d) Mg.
Last Answer : d) Mg.
Description : Mineral associated with cytochrome is (a) Cu (b) Mg (c) Cu and Mg (d) Fe.
Last Answer : (d) Fe.
Description : Bessemerization is carried out for (I) Fe (II) Cu (III) Al (IV) silver
Last Answer : Bessemerization is carried out for (I) Fe (II) Cu (III) Al (IV) silver A. I,II B. II,III C. I,III D. All
Description : Bessemerisation is carried out for: (P) Fe, (Q) Cu, (R )Al, (S) Ag
Last Answer : Bessemerisation is carried out for: (P) Fe, (Q) Cu, (R )Al, (S) Ag A. I,II B. II,III C. III,IV D. I,III
Description : Among the following, the number of elements showing only one non-zero oxidation state is: O,Cl,F,N,P,Sn,Tl,Na,Ti
Last Answer : Among the following, the number of elements showing only one non-zero oxidation state is: O,Cl,F,N,P,Sn,Tl,Na,Ti
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)
Description : The emf of a Deniell cell “Zn | Zn2+|| Cu2+| Cu” can be increased by (A) Decreasing the surface area of the electrodes (B) Increasing the concentration of zinc sulphate solution (C) Increasing the surface area of the electrodes (D) Increasing the concentration of copper sulphate solution
Last Answer : (D) Increasing the concentration of copper sulphate solution
Description : Which mineral is an essential part of thyroxin a. Fe b. Mg c. Iodine d. Na
Last Answer : Iodine
Description : `Pb` and `Sn` are exerted from their chief ores by:
Last Answer : `Pb` and `Sn` are exerted from their chief ores by: A. Carbon reduction and self ... and self reduction D. Self reduction and electrolysis
Description : Arrange the following order of the property indicated: (a). F, Cl, Br and I (negative electron gain enthalpy) (b). Mg, Al, Si and Na (ionization enthalpy) (c). C, N, O and F (second ionization enthalpy)
Last Answer : Ans. (a). I
Description : Which of the following materials is ferrimagnetic? a) Fe b) Sn c) Fe 2 O 3 d) FeCl
Last Answer : c) Fe 2 O 3
Description : How many of following metals impart a characteristic colour to the Bunsen flame ? `(i) Na " " (ii) Li " " (iii) K " " (iv) Ba` `(v) Sr " " (vi) Mg " "
Last Answer : How many of following metals impart a characteristic colour to the Bunsen flame ? `(i) Na " " (ii) Li " " (iii) K ... ix) `Be " " (x )Ca " " (x i)Cu`
Description : The metal used to recover copper from a solution of copper sulfate is - (1) Na (2) Ag (3) Hg (4) Fe
Last Answer : (4) Fe Explanation: The metal used to recover copper from a solution of copper sulfate is Fe.
Description : The following compounds are heated (i) `KNO_(3)` (ii) `Cu(NO_(3))_(2)` (iii) `Pb(NO_(3))_(2)` (iv) `NH_(4)NO_(3)` . Which of the following statement/s
Last Answer : The following compounds are heated (i) `KNO_(3)` (ii) `Cu(NO_(3))_(2)` (iii) `Pb(NO_(3)) ... and (iii) liberate `O_(2)` D. All statements are correct
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)
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.
Description : (a) What are fuel cells? Explain the electrode reactions involved in the working of H2 – O2 fuel cell. (b) Represent the galvanic cell in which the reaction Zn (s) + Cu2+ (aq) → Zn2+ (aq) + Cu (s) takes place. -Chemistry
Last Answer : (a) Fuel cells : These cells are the devices which convert the energy produced during combustion of fuels like H2, CH4, etc. directly into electrical energy. The electrode reaction for H2 – O2 fuel cell : (b) The galvanic cell may be represented as Zn (s) | Zn2+ (1M) || Cu2+ (1M) | Cu (s)
Description : Assertion :- `Zn(s)+Cu^(+2)(aq)rarr Zn^(+2)(aq)+Cu(s)` can be spilt into following half reactions `{:(Zn(s)rarrZn^(+2)+2e^(-),),(,"(Oxidation half rea
Last Answer : Assertion :- `Zn(s)+Cu^(+2)(aq)rarr Zn^(+2)(aq)+Cu(s)` can be spilt into following half ... Reason is False. D. If both Assertion & Reason are False.
Description : Assertion :- In the reaction `Zn(s)+cu^(+2)(aq)rarrZn^(+2)(aq)+Cu(s)` `Cu^(+2)` ions act as oxidising agent and Zn atoms act as a reducing agent. Reas
Last Answer : Assertion :- In the reaction `Zn(s)+cu^(+2)(aq)rarrZn^(+2)(aq)+Cu(s)` `Cu^(+2)` ions ... the Reason is False. D. If both Assertion & Reason are False.
Description : When the sample of Cu with Zn as impurity is to be purified by electrolysis, the appropriate electrodes are :
Last Answer : When the sample of Cu with Zn as impurity is to be purified by electrolysis, the appropriate electrodes are ... 4)","Impure zinc","Impure sample"):}`
Description : Cytosolic superoxide dismutase contains (A) Zn only (B) Cu only (C) Zn and Cu (D) Mn
Last Answer : Answer : C
Description : Trace elements are a. Zn+2, Cu+2, Mn+2 b. MO6+, Ni2+, B3+ and CO2+ c. Both a and b d. None of these
Last Answer : Ans: D