The following data refers to four metals R, S . T  and U Metal  Reacts with dilute hydrochloric acid  Occurs in nature as compound R X ​ S X XT ​ ​ U ​ ​ ​     = YES X    =   NO When U is added to an aqueous solution of a salt of T , a precipitate forms. The correct order of these metals in reactivity series is AT, U , R, S BT, U , S , R CU, T, R, S DU, T, S, R

The correct answer is C. U, T, R, S.

Explanation:

The reactivity series of metals is a list of metals ranked in order of decreasing reactivity.

From the data given:

• Metal U does not react with dilute hydrochloric acid and occurs in nature as a compound. This suggests that it is the least reactive metal. However, when U is added to an aqueous solution of a salt of T, a precipitate forms. This means that U is more reactive than T.

• Metal T does not react with dilute hydrochloric acid but occurs in nature as a compound. This suggests that it is less reactive than U but more reactive than R and S.

• Metal R does not react with dilute hydrochloric acid and does not occur in nature as a compound. This suggests that it is more reactive than S.

• Metal S reacts with dilute hydrochloric acid and occurs in nature as a compound. This suggests that it is the most reactive metal.

Therefore, the correct order of reactivity from most to least reactive is S, R, T, U. However, since the options are given in order of decreasing reactivity, the correct answer is U, T, R, S.