Zinc and its compounds

which of the following is /are true about the zinc

• non typical transition metal

• completely filled d orbitals

• mainly extracted from Zinc blende

• common oxidation state is +3

the major chemical reaction that occurs during roasting of Zns ore are

• Zns+O2 gives ZnO+SO2

• ZnCO3 gives ZnO+CO2

• oxidation of s,P,C as their oxides

• oxidation of non volatile impurities as oxides

which of the following is the process of reduction of ZnO in the extraction of Zinc ?

• Continuopus vertical retort process

• Belgian method

• selesian process

• all of the above

the correct statement about the spelter zinc is/are

• it is obtained after the condensation of zinc vapour in the vertical retort process

• pure zinc is obtained from spelter zinc when it is poured into cold water

• zinc dust and granulated zinc can be obtained from spelter zinc

• speter zinc is 99.5% pure

which of the following is not the product formed when zinc is exposed to moist air

• ZnO

• Zn(OH)2

• ZnCO3

• ZNCO3.ZnO

• ZnCO3.Zn(OH)2

philosopher's wool or pompholyx is

• Zn(OH)2

• ZNCO3

• ZnSO4

• ZnO

the products obtained by the acton of zinc with hot and conc. solution of Caustic soda are

• sodium hydroxide and hydrogen

• sodium zincate only

• sodium zincate and water

• sodium zincate and hydorgen

which of the following salts/chemicals can be kept in the zinc container for a long time safely

• CuSO4

• AgNO3

• HCl

• H2SO4

• none

the correct statement about filter ash test is/are

• is used for the detection of Zinc ion in the compound

• cobalt zincate is formed as a major product

• CoO.ZnO is called rinman's green

• Zinc oxide is formed while heating the zinc compounds

----- can be used to prepare white vitriol with dilute

sulphuric acid

• Zinc

• ZnO

• Zn(OH)2

• all of the above