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Q. Illustrate Uses of f-block element?
Lanthanides and many of their complexes have received wide industrial applications. For example, europium derivatives are used as phosphors in TV screen; samarium-cobalt alloys are used for making magnets, Nd2O3 and Pr2O3 are used for making welder's goggles, yttrium-aluminium garnets (YAG are used both in electronic equipment and as synthetic gems. Several lrtixed oxides are used as catalysts in cracking of petroleum. Cerium in the +4 oxidation state is used as an oxidising agent in quantitative analysis. Thorium nitrate has been used for more than a century in gas mantles. Till 1940, the only industrial application of uranium was as a colouring material in the manufacture of yellow glass. At present, the principal use of uranium and thorium is as a nuclear fuel.
Compounds with similar molecular formula but different properties are known as Isomers and the phenomenon is known as Isomerism.
Prepare an assignment on the topic commercial cells
Q. Show the rate of decrease in atomic radius? The rate of decrease in atomic radius along the lanthanide series and also along the actinide series is even less than that in th
K+O2=
How many atomic number does have Ne Because Ne has atomic number = 10 and F has atomic number = 9, the neon species that has 9 electrons is Ne+
Question 1: (i) What are the main physical properties of hydrogen sulphide? (ii) Which occupational group of workers is often exposed to hydrogen sulphide? (iii) O
Explain Newman projections The systematic name for "pullane" is 1,1-di-tert-butyl-2,4-diethylcyclopentane. Hence, structures B and C are Newman projections of the same compo
Q. What are the diffrent forms of energy? Ans: Kinetic energy is energy of motion. Gas molecules of a given substance move much more rapidly than do the molecules in the soli
The frequency of a wave of light is 12x 10 14 s -1 . The wave number associated with this light is: (1) 5x10 -7 m (2) 4x 10 -8 cm -1
Q. Explain about Atomic Radius? The atomic size decreases with increase in atomic number along any period in the long form of the periodic table due to increase in effective n
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