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A flask of ammonia is connected to a flask of an unknown acid HX by a 1.34 m glass tube (where "X" represents a halogen). As the two gases diffuse down the tube, a white ring of NH4X forms 91.8 cm from the ammonia flask. Identify element X (Name or symbol).
suppose we are preparing a solution of potassium permanganate KMno⁴ and need about 0.10 mol of the compound (that is 0.10 mol KMno⁴) How many grams of the compound do we need
Q5. A water sample is alkaline to both phenolphthalein and methyl orange. 200ml of water sample on
titration with N/25 HCl required 5ml of the acid up to phenolphthalein end point. When a few drops of
methyl orange are added to the same solution and titration was further continued to yellow color of
the solution just turn orange after the addition of another 12 ml of acid. Calculate the type and extent of
alkalinity present in water sample in different units.
suppose the temperature was lowered to 18C. How do you think this would affect the solubility of each solute?
Write the four quantum numbers corresponding to the electron described below:
1. 11th electron in 5f14
2. 8th electron of 4d10
3. 5th electron of 4p6
4. 4th electron of 3p4
5. 11th electron of sodium
The temperature increase of 225 mL of water at 25°C contained in a Styrofoam cup is noted when a 125g sample of a metal at 75°C is added. The greatest temperature increase will be noted if the metal is (a) lead; (b) aluminum; (c) iron; (d) copper.
1. Initial concentration of N2H4CO fertilizer, is 1.95 M and K = 1.5x 10^ -14
N2H4CO (aq) + H2O(l) ⇋ H2NCONH3 ^+ (aq) + OHˉ(aq)
2. Initial concentration of 4.25 M aniline, C6H5NH2 with Kb = 3.8 x 10^-10
C6H5NH2 (aq) + H2O(l) ⇋ C6H5NH3 ^+(aq) + OHˉ(aq)
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Using Valence shell Electron Pair Repulson (VSEPR) theory, predict the molecular geometry of Xenon tetrafluoride, XeF4
Using Valence shell Electron Pair Repulson (VSEPR) theory, predict the molecular geometry of Sufur trioxide, SO3
