Chemistry

The method of zone refining of metals is based on the principle of

The method of zone refining of metals is based on the principle of Options (a) greater mobility of the pure…

Silver is present in

Silver is present in Options (a) limonite (b) magnetite (c) galena (d) dolomite Correct Answer: galenaExplanation:No explanation available. Be the…

The role of cryolite in the metallurgy of extraction of aluminium is to

The role of cryolite in the metallurgy of extraction of aluminium is to Options (a) increase the conductivity of the…

Pyrolusite is an ore of

Pyrolusite is an ore of Options (a) manganese (b) tin (c) lead (d) polonium Correct Answer: manganeseExplanation:No explanation available. Be…

Aluminium is extracted from alumina (Al₂O₃) by electrolysis of a molten mixture

Aluminium is extracted from alumina (Al₂O₃) by electrolysis of a molten mixture of Options (a) Al₂O₃ + HF + NaAlF₄…

Mg is present in

Mg is present in Options (a) chlorophyll (b) haemoglobin (c) vitamin-D (d) vitamin-B Correct Answer: chlorophyllExplanation:No explanation available. Be the…

Method used for obtaining highly pure silicon, used as a semiconductor material,

Method used for obtaining highly pure silicon, used as a semiconductor material, is Options (a) crystallization (b) zone refining (c)…

Roasting is done in

Roasting is done in Options (a) blast furnace (b) reverberatory furnace (c) electric furnace (d) refractory furnace Correct Answer: reverberatory…

Calcination is used in metallurgy to remove

Calcination is used in metallurgy to remove Options (a) CO₂ and H₂S (b) H₂O and SiO₂ (c) H₂O and H₂S…

Colloidal solution of gold is prepared by

Colloidal solution of gold is prepared by Options (a) colloidal mill (b) double decomposition method (c) Bredig's method (d) Peptization…