2) which of the following is a synthesis reaction?
(1) cu + 2agno3 → cu(no3)2 + 2ag
(2) 2cu +02→ 2cuo
(3) cucoo3 → cuo + co2
(4) cuo + h2 → cu + h2o

(4) CuO + H₂ → Cu + H₂O.

Explanation:

(1) Cu + 2AgNO₃ → Cu(NO₃)₂ + 2Ag.

It is considered as a single replacement reaction that Cu replaces Ag in its salt AgNO₃.

(2) 2Cu + O ₂ → 2CuO.

It is a combustion reaction that Cu reacts with oxygen results CuO.

(3) CuCO₃ → CuO + CO₂.

It is a decomposition reaction that CuCO₃ is decomposed to CuO and CO₂.

(4) CuO + H₂ → Cu + H₂O.

It is considered as a synthesis reaction that two reactants CuO and hydrogen are reacted to produce Cu and H₂O.

So, the right choice is: (4) CuO + H₂ → Cu + H₂O.

i don t now

answer: option (b) is the correct answer.

explanation:

a covalent bond is formed by sharing of electrons. whereas polarity arises due to difference in electronegativity of two atoms.

therefore, more is the electronegativity of an atom which combines with the titanium, more readily it will induce a partial positive and negative charge.

thus, out of the given options fluorine is most electronegative and has an incomplete octet. therefore, it will readily combine with titanium to share the electrons and complete its octet.