Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
GROUP 14: TIN AND LEAD
Tin and lead give some resemblance to the lighter elements in group 14, especially Ge. Although they are uniquely more metallic in their physical and chemical characteristics, simple cationic chemistry is the exception rather than the rule. As with group 13, two oxidation states MIV and MII are found, the MII form giving more stable for lead.
Both substances have rather low abundance, but are commoner than other heavy metals. They occur in the minerals galena PbS and cassiterite SnO2. They each have various stable isotopes, Sn more than any other element (10). Some Pb isotopes are discovered from the radioactive decay of uranium and thorium. The isotopic composition of Pb (and thus its atomic mass) differs detectably according to the source, and such variations have been used to estimate the age the Earth of and of rocks.
The elements are readily made by reduction of their ores and are soft, low-melting, somewhat unreactive metals. Tin is required for plating, and both elements in low-melting alloys and as many elements. Applications of lead are declining as its substances are very toxic. A continuing major need is in leadacid batteries, which depend on two reactions involving the PbII, Pb0 and PbIV states:
Occurring at different electrodes, these show a cell potential of 2 V, greater than can be obtained easily from any other pair of electrode reactions in aqueous solution
Pb(NO)3 + Na3Po4 --> NaNo3 + PbPO4
THEORY OF MILLON TEST
Which of the following are isoelectronic and isostructural NO - 3 , CO 2- 3 ,ClO - 3 , S O 3 (1) NO - 3 , CO 2 - 3 (2) SO 3 , NO- 3
WHY WE CALCULATE GERM OIL ACIDITY OF WHEAT FLOUR?
INTRODUCTION : In this exercise you will learn various steps and procedures adopted while purchasing lab-related items. This exercise will acquaint you with practices of preparing
just explain a little bite of its sequence that why uranium is used
Separation of alkane, alkene and alkyne The gaseous mixture is passed via ammonical cuprous chloride solution. The alkyne (acetylene) reacts along with and makes a red preci
write the different units of hardness with their relationship
Ratio scales It is also possible to record liking or acceptability using magnitude estimation scaling methods, but consumers may find it difficult to handle the concept of rat
Dichromate titrations - oxidation reduction titrations These are titrations where, potassium dichromate is utilized as an oxidising agent in acidic medium. The medium is organi
Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd