C(s) + 2H2(g) → CH4(g) C(s) + 2Cl2(g) → CCl4(g)

H2(g) + Cl2(g) → 2HCl(g)

its B

p. s those are the equation breakdown

the second one is
Which statement is true?
✔ The first equation must be reversed and the third equation doubled.

atomic number of carbon is 6

electronic configuration of carbon is 1s²2s²2p²

orbital diagram of c is as shown here in the image.

the dissociation of nickel hydroxide is follows:

the concentration of hydroxide ion is

the equilibrium constant value of nickel hydroxide is = 6.1 * 10^-^1^6 and thus equilibrium equation can be written as:

thus, concentration of ni is 0.23 * 10^-^4 mol /l