Which of the following reactions do not
involve electrons being either lost or gained
by any of the reactants involved in the
reaction?
a 2 na + 2 h2o → 2 naoh + h2
b k20→2 k+ o2
c ca + f2 + caf2
d agno3 + licl → agcl + lino3

It's D.

Explanation:

That would be choice D which might be called a double decomposition reaction - an exchange of ions where no electrons are lost or gained. The silver chloride appears as a white precipitate.

The correct answer is AgNO₃ + LiCl → AgCl + LiNO₃ (option D)

Explanation:

A double displacement reaction is that two elements found in different compounds exchange positions, forming two new compounds. These chemical reactions do not present changes in the number of oxidation or relative load of the element.  Generally the exchange occurs between reagents that are ionic compounds in solution, where the anions and cations of the compounds are exchanged.

Double displacement reactions follow the following general chemical equation:

AB + CD → AD + CB

The initial compounds AB and CD react by exchanging "their partners" and thus form two new compounds: AD and CB.

AgNO₃ + LiCl → AgCl + LiNO₃ is a double displacement reaction,  where the anions and cations that exchange positions are Ag⁺, Li⁺, NO₃⁻ and Cl⁻.

state the principle of separating two immiscible liquids by separating funnel. describe an activity with diagram to separate a mixture of water and kerosene oil. answer: immiscible layers separate out in layers depending on their densities in separating funne

given:

mass of na = 115 g

excess cl2

to determine:

mass of nacl produced

explanation:

given reaction is-

2na(s) + cl2(g) → 2nacl(s)

since cl2 is in excess, na will be the limiting reagent

as per the reaction stoichiometry na: nacl = 1: 1

i.e. moles of na reacted = moles of nacl formed

now, # moles of na = mass of na/atomic mass

                                  = 115 g/23 g.mol-1 = 5 moles

therefore, moles of nacl = 5

molar mass of nacl = 58 g/mol

mass of nacl = 5 moles * 58 g.mol-1 = 290 g

ans: amount of nacl produced = 290 g