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Tl? ³ is less stable than Tl? ¹ (inert pair effect). Going down the group 13, stability of lower oxidation state increases. In case of B, Al, Ga and In, higher O.S. +3 remains more stable than lower O.S. +1 . But, in last stable element, thallium (Tl), lower O.S. +1 become more stable than higher O.
The para-magnetism of solution of alkali metals in liquid ammonia and its deep blue color is due to ammoniated electrons. Which absorb energy in visible region of light.
Ca plays important role in Neuromuscular function and interneuronal transmission. The daily requirement of Mg and Ca in the human body is estimated to be 200 – 300mg. All enzymes that utilise ATP in phosphate transfer require Mg as the cofactor. The bone in human body is NOT an inert and unchanging
A, B and C are correct statements. The H-H bond dissociation enthalpy is the highest for a single bond between two atoms of any element. Hydrogen does not reduce oxides of metals that are more active than iron.
PV = nRT P = nRT . (1/V) Plot of P vs (1/V) would be straight line passing through origin having slope = nRT. At high temperatures, P vs (1/V) would have greater slope.
20 g of 20% CaCO? = 20 × (20/100) = 4 g CaCO? CaCO? (100 g) - (1200 K)-> CaO + CO? (44 g) According to the reaction, 100 g of CaCO? → 44 g of CO? 4 g CaCO? → (4×44)/100 g of CO? = 1.76 g of CO?
n (B) = 3/2 n (B) = 3, n (O) = 2 n (Total) = 3 + 2 = 5 X (B) = n (B) / n (T) = 3/5 X (O) = n (O) / n (T) = 2/5 P (S) = P° (B)X (B) + P° (O)X (O) P (S) = 280 * (3/5) + 420 * (2/5) = 336 mm of Hg
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