which of the following equations accurately expresses the first law of thermodyn

Question

which of the following equations accurately expresses the first law of thermodynamics An apparatus in which a lightbulb and two graphite rods are connected in series to a source of electricity is constructed so that the bulb lights up only when enough electric cument flows between the rods. What image would represent the lightbulb's glow when the rods are put into each of the following? (a) (b) (c) 1) HCl(aq) 2) NaNO3(aq) 3) CaSO4 (s) 4) H2CO3(aq) 5) glucose (aq) 6) CuCl2() O (a) CO (a) O (a) O (a) O (a) O (a) O (b) O (b) O (b) (b) O (b) O (b) CO (c) O (c) O (c) (c) O (c) (c) View Solu Save Answer 01 13 51 -1Exit Activity

Explanation / Answer

(a) HCl being a strong acid underoges complete ionisation, gives abundant number of H+ and Cl- ions which carry electricity easily.

So, it represents image (b)

(2) NO2 (aq.) when dissolved in water forms a weak acid HNO2 which underoges partial ionisation. So, it conducts electricity moderately, so, the bulb lights dim.

(c)

(3) CuSO4 (s), as it does not allow its ions to migrate in solid state. It is a non electrolyte in solid state. So, no light glows.

(a)

(4) H2SO3 (aq.) is weak acid undergoes partial ionisation. SO, it represents (c)

(5)

Sucrose is a non electrolyte which does not give any ions in its aqueous solution. So, it represents (a)

(6)

CrCl2(l) is weak electrolyte because in liquid state the moment of ions is slow. So, it represents (c)

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