List of practice Questions

When 4A of current is passed through a 1.0L, 0.10 M Fe\(^3+\)(aq) solution for 1 hour, it is partly reduced to Fe(s) and partly to Fe\(^2+\)(aq). Identify the incorrect statement.
Which one of the following electrolytes is most effective for the coagulation of $Fe(OH)_3$ sol?
Which of the following choices represents \(^{239}_{94}Pu\) producing a positron?
Calculate the mass percent of 60 g H2SO4 dissolved in the solution of 180 mL of water.
Among all the given compounds, which will have D-configuration?
All of the following may be true concerning catalysts and the reaction which catalyse except,
\(\text{NH}_3\) has a \( K_b \) of \( 1.8 \times 10^{-3} \). Which of the following has a \( 5.6 \times 10^{-10} \)?
Among \( [\text{Ni(CN)}_4]^{2-} \), \( [\text{NiCl}_4]^{2-} \), and \( [\text{Ni(CO)}_4] \), which one has the following:
Which of the following expressions represents the solubility product for Cu(OH)$_2$?
Beryllium gives a compound X with the following percentage composition: Be = 6.1%, N = 37.8%, Cl = 48%, H = 8.1%. The molecular weight of X is 148 g/mol and that of Be is 9 g/mol. The molecular formula of the compound is:
An object experiences a greater buoyant force in seawater than in fresh water. The most likely reason for this is
The reaction below represents the Haber process for the industrial production of ammonia, \[ N_2(g) + 3H_2(g) \rightleftharpoons 2NH_3(g); \Delta H^\circ = -92 \, {kJ} \] The optimum conditions of temperature and pressure are chosen as a compromise between those that favour a high yield of ammonia and those that favour a fast rate of production. Economic considerations are also important. Which statement is correct?
Ammonia reacts with water to form the ammonium ion and hydroxide ion. \[ {NH}_3 + {H}_2{O} \longrightarrow {NH}_4^+ + {OH}^- \] According to the Bronsted-Lowry definition of acids and bases, what is the conjugate acid of ammonia?

The first step in producing pure lead from galena $(PbS)$ is as follows: $ 2{PbS}(s) + 3{O}_2(g) \longrightarrow 2{PbO}(s) + 2{SO}_2(g) $. 
All of the following are true concerning this reaction except:

When the solids Ba(OH)2 and NH4SCN are mixed, a solution is produced and the temperature drops. \[ {Ba(OH)}_2(s) + 2{NH}_4{SCN}(s) \rightarrow {Ba(SCN)}_2(aq) + 2{NH}_3(g) + 2{H}_2{O}(l) \] Which statement about the energetics of this reaction is correct?
Argon crystallises in fcc arrangement and the density of solid and liquid Ar is 1.59 g/cm\(^3\) and 1.42 g/cm\(^3\), respectively. The percentage of empty space in liquid Ar is
A student wished to produce only carbon from the dioxide and water vapour combustion of methane, CH\(_4\). To accomplish this the student should
Which of the following elements is the most chemically similar to Na?
Calculate the rate constant for the radioactive disintegration of an isotope that has a half-life of 6930 yr.

The following data was obtained for the reaction, 

Which of the following are true statements? 
I. The heat capacity of a substance is the amount of heat that substance can hold per unit of temperature. 
II. The specific heat for a single substance is the same for all phases of that substance. 
III. When heat is added to a fluid, its temperature will change less if it is allowed to expand.

Compared to an electron with a principal quantum number of 1, an electron with a principal quantum number of 2 will have a

Which species have delocalised electrons? 

Arrange the following compounds in the increasing order of their reactivity towards HCN: 
I. Acetaldehyde 
II. Acetone 
III. Di-tert-butyl ketone

Choose the most appropriate options. The magnetic moment of M^{x+} (atomic number = 25) is $\sqrt{5}$ BM. Then, the oxidation number x of M is: