Answer:
Chlorine is the element located in period 3, group 17 of the periodic table.
Explanation:
 
        
                    
             
        
        
        
Answer:
The correct answer is 160.37 KJ/mol. 
Explanation:
To find the activation energy in the given case, there is a need to use the Arrhenius equation, which is,  
k = Ae^-Ea/RT
k1 = Ae^-Ea/RT1 and k2 = Ae^-Ea/RT2
k2/k1 = e^-Ea/R (1/T2-1/T1)
ln(k2/k1) = Ea/R (1/T1-1/T2)
The values of rate constant k1 and k2 are 3.61 * 10^-15 s^-1 and 8.66 * 10^-7 s^-1.  
The temperatures T1 and T2 are 298 K and 425 K respectively.  
Now by filling the values we get:  
ln (8.66*10^-7/3.61*10^-15) = Ea/R (1/298-1/425)
19.29 = Ea/R * 0.001
Ea = 160.37 KJ/mol
 
        
             
        
        
        
<u>Answer:</u> The true statement is iron can reduce  to gold metal
 to gold metal
<u>Explanation:</u>
Single displacement reaction is defined as the reaction in which more reactive element displaces a less reactive element from its chemical reaction.
The reactivity of metal is determined by a series known as reactivity series. The metals lying above in the series are more reactive than the metals which lie below in the series.

Metal A is more reactive than metal B.
We are given:
Iron can reduce copper, silver can reduce gold, sodium can reduce iron and copper can reduce silver metal.
The increasing order of reactivity thus follows:

where, sodium is most reactive and gold is least reactive
For the given options:
<u>Option 1:</u>  Copper cannot easily reduce sodium ion to sodium metal because it is less reactive.

<u>Option 2:</u>  Iron cant easily reduce gold ion to gold metal because it is more reactive.

<u>Option 3:</u>  Silver cannot easily reduce iron ion to iron metal because it is less reactive.

Hence, the true statement is iron can reduce  to gold metal
 to gold metal
 
        
             
        
        
        
Answer:
there is no shift in the state 
Explanation:
The correct answer is - There is no shift in the state.
Reason -
If K > Q, a reaction will proceed forward, converting reactants into products.  If K < Q, the reaction will proceed in the reverse direction, converting products into reactants.  If Q = K then the system is already at equilibrium. 
where Q, is the reaction Quotient
 
        
             
        
        
        
Answer:
D
Explanation:
 Mendeleev periodic table predicted the properties of undiscovered element like the eka-aluminium.