Description : What are amphoteric oxides? Choose the amphoteric oxides from amongst the following oxides: Na2O, ZnO, Al2O3, CO2, H2O -Chemistry
Last Answer : Those oxides which reacts with acids as well as bases to produce salts and water are called amphoteric oxides, e.g. Na2O, ZnO, are amphoteric oxides among given oxides.
Description : Givecn that : `Zn+1//2O_(2)rarr ZnO+84000` cal ……………1 `Hg+1//2O_(2)rarr HgO+21700` cal …………2 The heat of reaction `(Delta H)` for, `Zn+HgO rarr ZnO+Hg
Last Answer : Givecn that : `Zn+1//2O_(2)rarr ZnO+84000` cal 1 `Hg+1//2O_(2)rarr HgO+21700` cal 2 ... cal B. 62300 cal C. `-105700` cal D. `-62300` cal
Description : Which of the following is produced during the following reaction ? `CO(g)+H_(2)overset(575K)underset(ZnO,Cr_(2)O_(3))rarr` ……?
Last Answer : Which of the following is produced during the following reaction ? `CO(g)+H_(2)overset(575K)underset(ZnO,Cr_(2)O_ ... 3)COOH` C. `HCOOH` D. `CH_(3)OH`
Description : Assertion : Reduction of ZnO with carbon is done at `1100^(@)C`. Reason : At this temperature, `DeltaG^(@)` is negative and the process is spontaneous
Last Answer : Assertion : Reduction of ZnO with carbon is done at `1100^(@)C`. Reason : At this temperature, ... ^(@)` is negative and the process is spontaneous.
Description : Extraction of Zn is based on the following thermodynamic reaction. (A)` 2ZnS + 3O_(2) to 2ZnO+ 2SO_(2)` (B) `ZnO + C to Zn + CO" " DeltaG_(f)^(0)` are
Last Answer : Extraction of Zn is based on the following thermodynamic reaction. (A)` 2ZnS + 3O_(2) to 2ZnO+ 2SO_(2)` (B) ... (5) J//"mol"` The value of X a will be
Description : Go through the following graph and answer the following questions. To make the following reduction process spontaneous, temprature should be : `ZnO+C
Last Answer : Go through the following graph and answer the following questions. To make the following reduction process spontaneous, ... )C " but " lt 1000^(@)C`
Description : In Belgan process, for reduction of ZnO to Zn reductant is
Last Answer : In Belgan process, for reduction of ZnO to Zn reductant is A. Water gas B. Coal or Coke C. Al D. `H_(2)`
Description : In the following reaction: `ZnS+O_(2)overset(Delta)rarrA+ZnO` `4HCl+O_(2)overset(CuCl_(2))rarrB+2H_(2)O` `A+B overset(hv)rarrC` Then A, B and C are:
Last Answer : In the following reaction: `ZnS+O_(2)overset(Delta)rarrA+ZnO` `4HCl+O_(2)overset(CuCl_(2))rarrB+2H_(2)O` ` ... SOCl_(2)` D. `SO_(3),HClO_(3),HClO_(4)`
Description : Plants take zinc in the form of (a) ZnSO4 (b) Zn++ (c) ZnO (d) Zn.
Last Answer : (b) Zn++
Description : __________ is used as a catalyst in fat splitting. (A) ZnO (B) Ni (C) V2O5 (D) FeO
Last Answer : (A) ZnO
Description : Co-efficient of thermal expansion of glass is decreased by the addition of __________ during its manufacture. (A) CaO (B) MnO2 (C) ZnO (D) FeS
Last Answer : (C) ZnO
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
Description : Fat splitting catalyst is (A) CaCO3 (B) ZnO (C) Al2O3 (D) Fe
Last Answer : (B) ZnO