Which of the following redox reactions do you expect to occur spontaneously in the forward direction?

check all that apply.

ni(s)+pb2+(aq)→ni2+(aq)+pb(s)
al(s)+3ag+(aq)→al3+(aq)+3ag(s)
ni(s)+zn2+(aq)→ni2+(aq)+zn(s)
fe2+(aq)+cd(s)→fe(s)+cd2+(aq)

The correct answer is Option 1 and Option 2.

Explanation:

Redox reactions are termed as the reactions in which reduction and oxidation reactions occur simultaneously.

Reduction reactions are the ones where a substance gains electrons. The oxidation state of the substance gets reduced.

Oxidation reactions are the ones where a substance looses electrons. The oxidation state of the substance is increased.

All the given reactions are a type of single displacement reactions. In this, a more reactive metal displaces a less reactive metal from its chemical reaction. The reactivity is determined from a series known as reactivity series. A metal which lies above in the series is more reactive than the metals which lie below in the series.

From the given options:

Option 1:

Here, nickel lies above in the series than lead. Thus, it will easily replace lead from its chemical reaction.

Option 2:

Here, aluminium lies above in the series than silver. Thus, it will easily replace silver from its chemical reaction.

Option 3:

Here, nickel lies below in the series than zinc. Thus, it will not easily replace zinc from its chemical reaction.

Option 4:

Here, cadmium lies below in the series than iron. Thus, it will not easily replace iron from its chemical reaction.

Thus, the correct answer is Option 1 and Option 2.

the answer is minerals.

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

hope this : )