Beryllia (which is used in making crucibles for melting uranium & thorium) is superior to alumina in all respects for high temperature (> 1900°C ) use, except______________?

Related Mcqs:

A sample of well water contains 140 gm/m3 Ca2+ ions and 345 gm/m3 Na+ ions. The hardness of the sample of water, expressed in terms of equivalent CaCO3 in gm/m3 is (assuming atomic masses of Ca :40, Na : 23, C : 12, O : 16) ?

A. 350 B. 485 C. 140 D. 345...

Heat of neutralisation of a strong acid and strong base is always a constant value, i.e., 57 KJ/Kg mole. This is because_________________?

A. The strong base and strong acid reacts completely B. The salt formed does not hydrolyse C. Only OH- and H+ ions react in every case D. The strong base and strong acid reacts in aqueous solution...

Addition of a non-volatile solute to a solvent produces a ______________ in its solvent?

A. Freezing point elevation B. Boiling point depression C. Vapor pressure lowering D. All A., B. & C....

The vapour pressure of water is given by, in Psat = A – (5000/T), where A is a constant, Psat is the vapour pressure in atm. and T is the temperature in K. The vapor pressure of water in atm. at 50°C is approximately__________________?

A. 0.07 B. 0.09 C. 0.11 D. 0.13...

80 kg of Na2SO4 (molecular weight = 142) is present in 330 kg of an aqueous solution. The solution is cooled such that. 80 kg of Na2SO4 .10H2O crystals separate out. The weight fraction of Na2SO4 in the remaining solution is_________________?

A. 0.00 B. 0.18 C. 0.24 D. 1.00...