پرسیاری وزاری کیمیا 2020-2021 خولی دووەم ، خوێندنی ئینگلیزی

 The pH of an aqueous solution composed 2×10^-4 mol of ⁺ H₃O
ions in 250 mL of its solution is equal to

Which of the following is the equilibrium constant for an anion hydrolysis reaction

The solution that contains the precisely known concentration of a solute is known as

A solution made from ethanol ,C₂H₅OH,and water is 1.76m in ethanol

? How many moles of ethanol are contained per 250g of water

The rate of the slow reaction increases by

In the following reaction :( BFe_3(aq)+F^–_(aq)→BF₄^–_(aq) ) which of the following is Lewis base

the spectator ion in the following reaction

      Al_(S)+H₂SO_{4(aq)  →}

Which one of the following statements is incorrect

All of the following statements are true about the collision theory except

The strength of an acid does not depend on

A reaction has ∆H=-74.8kJ/mol , ∆S=-0.081kJ/mol.K at 27^oC which of the following is correct

The boiling point of a solution is higher than that of a pure solvent because

The rate law of the following reaction: A+2B→2AB₂ ,is  R=K[B]²   , what happens to the reaction rate when the
concentration of both reactants is doubled

The concentration of H3O+ ions in aqueous solution of Ba(OH)₂ is1x10^-11M,

? what is the molar concentration of solution

A substance that can react as an acid or a base

 A proposed mechanism for the reaction is

2NO+H₂→N₂O+H₂O  :slow

N2O+H₂→N₂+H₂O    : fast

? which of the following is correct

How much energy would be absorbed as heat by 75g of iron when heated from 295K to 301K if its specific heat
is 0.449J/g.K

? Which of the following solutions with the same concentrations has lower [⁺H₃O]

The energy required to raise the reactant to the level of the activated complex is

The enthalpy change that occurs during the complete combustion of one mole of an element or compound is
called

In the following an exothermic gaseous reaction :( 2CO+O₂→2CO₂ ) , which of the following statements is true
about the reaction

A substance that formed when a strong acid has lost a proton

Which of the following represents the formation equation

In the following hypothetical reaction :(A₂+B₂→2AB+30KJ), the activation energy for the forward reaction equal
50kJ/mol ,the activation energy for reverse reaction is equal to

Calculate the moles of NaOH if 100 mL of its solution neutralized with 200 mL of 0.01M HB

The entropy increases at

In the following reaction :( 2HCl_(g)+184.6KJ→H_2(g)+Cl_2(g) ), the standard formation enthalpy of HCl equals

 For an exothermic dissolution process, the increasing of the temperature causes

The value of equilibrium constant for this gaseous reaction :(N₂O₄ ⇒2NO₂) is 0.1 at a specified temperature,
what would be the value of that constant for the reverse reaction at the same condition

Adding NH₄Cl to NH₃ solution leads to

In equilibrium gaseous reaction: 2NO+Cl₂ 2NOCl +energy, which of the following shift the reaction to the
right

In the following gaseous reaction:( N₂+3H₂↔2NH₃) it was found the [NH3]=0.62 M ,[H2]=0.14 M, [N2]=0.45 M
the value of the equilibrium constant equals:

How many moles of ammonium sulfate must be dissociate to produce 0.4 mol of sulfate ion

Unknown liquid miscible with toluene and immiscible with water which of the following statements is correct

The solubility product of cadmium carbonate, CdCO₃ , is 1.0×10^-12 .In a saturated solution of this salt, the
concentration of carbonate ions is

The net ionic equation for the precipitation Nickel ( II )sulfide is

All of them are correct except

In aqueous solution contains, Ca⁺²,SO₄^-2 ions, CaSO₄ precipitates if

When barium chloride solution is mixed with sodium nitrate

The boiling-point elevation of a solvent is 2.4oC, when the concentration of the solution containing a
nonelectrolyte solute is 3.1m, what is the value of molal boiling-point constant

Which of the following ions hydrolyze in aqueous solution

Aqueous solution of NH3 is an Arrhenius base because

The following reaction :(2A+B→A₂B ) is occur by one step mechanism the rate law for the reaction is

The common-ion causes

While mixing a small quantity of water with a large quantity of ethanol, water considered as

When polar compound ionizes completely in water the compound is

? Which of the following is homogenous mixture

:The methyl orange is used to determine the equivalence point in one of the following titration

If the pH range for transition interval is (3.1- 4.4)

The dilute aqueous solution of a weak acid contains

?Which of the following is a binary acid