Embibe Experts Solutions for Exercise 1: SAT 2019

Read the following statements.
Statement I: Sodium metal reacts violently with water to produce heat and fire.
Statement II: Potassium metal reacts violently with water to form potassium hydroxide and hydrogen gas.
 Select the correct answer from the option given below

Which of the following set of reactions will NOT occur?

I. ${\mathrm{MgSO}}_4\left(\mathrm{aq}\right) + \mathrm{Fe}\left(\mathrm{s}\right) \to {\mathrm{FeSO}}_4\left(\mathrm{aq}\right) + \mathrm{Mg}\left(\mathrm{s}\right)$

II. ${\mathrm{CuSO}}_4\left(\mathrm{aq}\right) + \mathrm{Fe}\left(\mathrm{s}\right) \to {\mathrm{FeSO}}_4\left(\mathrm{aq}\right) + \mathrm{Cu}\left(\mathrm{s}\right)$

III. ${\mathrm{MgSO}}_4\left(\mathrm{aq}\right) + \mathrm{Cu}\left(\mathrm{s}\right) \to {\mathrm{CuSO}}_4\left(\mathrm{aq}\right) + \mathrm{Mg}\left(\mathrm{s}\right)$

IV. ${\mathrm{CuSO}}_4\left(\mathrm{aq}\right) + \mathrm{Zn}\left(\mathrm{s}\right) \to {\mathrm{ZnSO}}_4\left(\mathrm{aq}\right) + \mathrm{Cu}\left(\mathrm{s}\right)$

The following observations are given for four metals:
 I. Metal H does not react with dilute $\mathrm{HCl}$.
 II. Metal K reacts with warm water.
 III. Metal L does not react with water but displaces metal H from its aqueous salt solution.
 IV. Metal M reacts with cold water.
 Choose the correct decreasing order of reactivity of these metals amongst the following. 

Consider the electrochemical cells(I and II) shown in the following figures and select the correct statement about these cells 

Read the following table:

Based on the above table consider the following statements
 I. Reaction of Y with ${\mathrm{CuSO}}_4$ solution produces $\mathrm{Cu}$ metal.
 II. Z is the most reactive element and X is the least reactive.
 III. Y is more reactive than X and less reactive than Z.
 IV. Metal Y produces $\mathrm{Zn}$ on reaction with ${\mathrm{ZnSO}}_4$ solution.

Which of the following options gives the correct statements?

Two beakers A and B contain iron(II) sulphate solution. In the beakers A and B, small pieces of copper and zinc are placed respectively. It is found that a grey deposit forms on the zinc but not on the copper. From these observations, it can be concluded that: