Chemistry
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New answer posted
a year agoContributor-Level 10
Ba (OH)? ? Ba? ² + 2 (OH)?
Initial: 0.005M, 0, 0
Final: 0, 0.005, 0.010
[OH? ] = 0.01 M = 10? ² M
Kw = [H? ] [OH? ]
[H? ] or [H? O? ] = Kw/ [OH? ] = 10? ¹? /10? ² = 10? ¹² M
∴ [H? O? ] = 1 * 10? ¹² M
New answer posted
a year ago
Contributor-Level 10
NaOH - Base
Be (OH)? - Amphoteric
Ca (OH)? - Base
B (OH)? - Acidic
Al (OH)? - Amphoteric
New answer posted
a year agoNumber of electrons present in 4f orbital of Ho³? ion is __________.
(Given atomic number of Ho = 67)
Contributor-Level 10
? Ho = [Xe] 4f¹¹ 6s²
∴ Ho? ³ = [Xe] 4f¹? 6s?
Number of electrons in 4f- subshell = 10
New answer posted
a year agoContributor-Level 9
When positive charge increases, ionic radii decreases in isoelectronic ions
Al?³ < Mg? < Na? < K?
New answer posted
a year agoContributor-Level 10
Δx . Δp = h/4π
Δx . mΔv = h/4π
Δv = 5 * 10? * 0.02/100 = 1000 m/s
∴ Δx = h/ (4πmΔv) = 6.63*10? ³? / (4*3.14*9.1*10? ³¹*1000)
= 5.8 * 10? m
= 58 * 10? m.
New answer posted
a year agoContributor-Level 10
CH? + I? CH? I + HI
It is reversible due to reducing nature of HI but it can be irreversible by addition of oxidizing agents like, HNO? , HIO? , HgO, etc. which will oxidize HI into I?
New answer posted
a year agoContributor-Level 10
P? = 300 kPa = 3 * 10? Pa = 3 bar
T? = 300 K
P? = 1.2 * 10? Pa = 12 * 10? Pa = 12 bar
T? =?
P? /T? = P? /T?
3/300 = 12/T?
T? = (12 * 300)/3 K = 1200 K
∴ T in °C = 1200 - 273 = 927°C
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