Which of the following statement is incorrect ?a)Oxide of aluminium `(Al_(2)O_(3))` and arsenic `(As_(2)O_(3))` are amphoteric.b)Oxide of chlorine `(Cl_(2)O_(7))` is less acidic than oxide of nitrogen `(N_(2)O_(5))`.c)Oxide of carbon `(CO_(2))` is more acidic than oxide of silica `(SiO_(2))`.d)The correct increasing order of basic character of various oxides is `H_(2)O lt CuO lt MgO lt CaO`.A. Calamine and siderite are carbonatesB. Argentite and cuprite are oxidesC. Zinc blende and pyrites are sulphidesD. Malachite and azurite are ores of copper

Which of the following statement is incorrect ?a)Oxide of aluminium `(

1.	Which of the following statement is incorrect ?a)Oxide of aluminium `(Al_(2)O_(3))` and arsenic `(As_(2)O_(3))` are amphoteric.b)Oxide of chlorine `(Cl_(2)O_(7))` is less acidic than oxide of nitrogen `(N_(2)O_(5))`.c)Oxide of carbon `(CO_(2))` is more acidic than oxide of silica `(SiO_(2))`.d)The correct increasing order of basic character of various oxides is `H_(2)O lt CuO lt MgO lt CaO`.A. Calamine and siderite are carbonatesB. Argentite and cuprite are oxidesC. Zinc blende and pyrites are sulphidesD. Malachite and azurite are ores of copper
Answer» Correct Answer - B

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Consider the following statements and arrange in the order of true/false as given in the codes. `S_(1)`:Cuprite, Limonite and Zincite are oxide ares `S_(2)` Magnesite and carnallite are magnesium ores `S_(3)`: Chalcocyte and azurite are ores of copper `S_(4)` Feldspar an mica minerals contain aluminium.A. TTTTB. FTFFC. FFTTD. TTFT
Which of the following statements is correct about the role of substances addedd in the froth floatation process?A. Collectors enhance the non-wettability of the mineral particlesB. Collectors enhance the wettaability of gangue particlesC. By using depressents in the process two sulphides ores can be sepreatedD. Froth stablisers decrease wettability of gangue.
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the common impurities present in bauxite areA. CuOB. ZnOC. `Fe_(2)O_(3)`D. `SiO_(2)`
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The chemical composition of salg formed during the smelting process in the extraction of copper is :A. `Cu_(2)O+FeS`B. `FeSiO_(3)`C. `CuFeS_(2)`D. `Cu_(2)S++FeO`
Which of the following statement is incorrect about the extractive metallurgy of coper?A. Matte chiefly consists of cuprous sulphide and some ferrous sulphide.B. Most of the impurity of iron sulphide is removed as fusible slag during roasting.C. The copper pyrites is concentrated by froth floatiation process.D. The copper obtained from Bessomer converter is called as blister copper.
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