2a list of techniques used to separate mixtures is given below.
fractional
distillation
simple
distillation crystallization filtration diffusion
from the list choose the most suitable technique to separate the following.
water from aqueous copper(ii)
helium from a mixture of helium and
copper(ii) sulphate from aqueous copper(ii)
ethanol from aqueous
barium sulphate from a mixture of water and barium

explanation: no but i do not usually comment

alkaline metals are lithium, sodium, rubidium, potassium, cesium and francium.

alkali metals have electronegativity from 0.7 to 1, lowest in periodic table of elements, which means that alkali metals (i group in periodic table) has positive oxidation number in compounds.

electronegativity is a chemical property that describes the tendency of an atom to attract a shared pair of electrons towards itself.

alkaline metals (far left in main group) have lowest ionizations energy and easy remove valence electrons,

for example, potassium is the alkali metal and has a single valence electron in the outer electron shell.

electron configuration of potassium is: ₁₉k 1s²2s²2p⁶3s²3p⁶4s¹.

they can not exist alone in nature, because they are very reactive.

cytokinesis is the splitting of a cell membrane to form 2 identical daughter cells. it's similar to mitosis as both cells have identical copies of dna and cytokinesis is a step in the mitotic cycle.

i think that the answer is c