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SAMPLE CHEMISTRY QUESTIONS
If 0.5 g of a solute (molar mass 100 g mol-1) in 25 g of solvent elevates the boiling point by 1 K. the molar boiling point constant of the solvent is?
∆Tb = kbm
M = 1000W2/M2W1 = (1000*0.5) / (100*25) = 1/5
Now 1 = kb * 1/5 or kb = 5
Transition elements from complexes due which of the following reason?
- Para magnetism
- Vacant d-orbitals
- Large nuclear charge
- Small cation size
Vacant orbitals of central metal atom or iron are filled by ligands to form metal complexes.
In Chemistry, a coordination complex or metal complex consists of a central atom or ion which is usually metallic and is called the coordination center and a surrounding array of bound molecules or ions that are in turn known as ligands or complexing agents. Many metal containing compounds, especially those of transition metals are coordination complexes.
500 ml of 0.75 w/v % NaCl solution would contain how many grams of NaCl?
- 0.75 g
- 1.5 g
- 3.75 g
- 4.8 g
w/v % = (mass of solute/volume of solution) * 100
0.75 = (M/500) * 100 = 0.0075 * 100 or M = 0.0075 * 500 = 3.75 g of NaCl