The electronic configuration of cu2+ ion is :The electronic configuration of cu2+ ion is :

Which is the correct order for the listed atoms with increase of the atomic radius :Which is the correct order for the listed atoms with increase of the atomic radius :

A π-bond is the result of :A π-bond is the result of :

What is the ground electronic state of Mn 2+

The capability of alcohols to form intermolecular hydrogen bonds leads to:

Which is the correct order of halogen ions with decrease of reductive properties?

The the element X has an atomic number of 8 and a mass number of 17. The atoms of this element contain :

Which of the following elements exists as a monoatomic gas under standard conditions?

Hydrogen may NOT be obtained by

The industrial process of production of sulphuric acid includes the following stages

Mark the line which includes only salts, whose water solutions are basic:

Chlorine CANNOT be obtained

Increasing the pressure in an equilibrium system containing gas molecules leads to the withdrawal of the chemical equilibrium in the direction of the reaction

At two fold increase of the pressure the rates of the straight and the reverse reaction of the system A(g) + 2B(g) = AB2(g) are changed accordingly

10 moles of benzene contain

In oxidative -reduction processes the reducer

In oxidative-reductive processes the oxidising agent

Oxidative reductive processes could be

The oxidation number for hydrogen in NaH is

When nonspontaneous redox reactions occure by use of a direct electric current, the process is called

The hydroxonium ion is represented as

The chemical elements presented are arranged in order of decrease in their reactivity according to the activity series of metals. Ca , Na , Mg , Zn , Fe , H , Cu , Hg , Ag , Au Which is the best reducing agent ,which is oxidised the easiest?

The cathode in an electrochemical cell is the electrode that is

With addition of a catalyst to a system at equilibrium

The chemical reaction 2Cl2 + H2O —><—O2 + 4HCl is in chemical equilibrium. The rate of the forward reaction is

Hydrogen peroxide is easily decomposed to water and oxygen according to the reaction 2H2O2–> 2H2O + O2 . It’s ability is increased in the presence of H3PO4

How many times the rate of the reaction 2NO + O2 —> 2NO2 will increase if the concentration of all substances is increased two times

The reaction rate of a multistage reaction is determined by

The chemical elements of group IB have

The isotopes

The principal quantum number

There azimuthal quantum number

Finding the permitted states of electrons

Which statement for an equilibrium system is true?

The equilibrium constant of a given reaction depends on

Henry’s law is Is followed when

The Tyndall effect is due to

Indicate the wrong statement

How the degree of electrolyte dissociation(a) and the dissociation constant (KD)of solution of HCN will change upon increasing its concentration

The foam is a system of

If to an aqueous solution of HCN is added NaOH the degree of electrolyte dissociation (a) for HCN

What is the pH value of 0.01M solution of HCl

An aqueous solution of a salt has pH 9. Thus it follows that this is a salt of :

The maximal oxidation state of the atoms of chemical elements is equal to

A colloid of Al(OH)3 with positively charged granules coagulates with the addition of a certain amount of electrolyte. Which of the listed electrolytes, on equal terms( concentration ,volume) will cause the fastest coagulation?

Which of the presented reactions is NOT oxidative-reductive ?

For manufacture of nitric acid two oxides are used :

On combustion of ammonia, the nitrogen is converted to:

Which statement about the four quantum numbers which describe electrons in atoms is INCORRECT?

In reaction A has an activation energy of 250 kJ And reaction Bhas an activation energy of 100 kJ which of the following statements MUST be correct?

In which row against the type of the chemical bond is a suitable listed example?

The crystalline substance X is very soluble in water, it melts when heated, and its (aqueous solution does NOT conduct electricity. Substance X can be:

In which pair of substances is the oxidation number of carbon -4 and +4, respectively?

Which of the following substances is the electrolyte?

At constant temperature an aqueous solution of glucose with concentration of 1mol/L compared to water has

In which of the indicated pairs there is NO correspondence between the chemical formula and the name of the substance?

Interaction does NOT occur between aqueous solutions of

The maximum number of electrons in the third electron shell of atoms is

The rate of a chemical reaction Fe(s) + H2SO4(l) —>FeSO4(l) + H2(g) does NOTdepend on

From the fact that two aqueous solutions of glucose and sucrose have the same osmotic pressure, it can be concluded that the solutions are

The mass of the solute and the mass of water in 150 g of an aqueous solution of potash (K2CO3) with a mass fraction of 5% are, respectively

Two fructose solutions (1) and (2) have concentrations c1 and c2 such that of c1<c2. The boiling points(Tk1 and Tk2) of the solutions can be said that

When AgNO3(l) is added to an aqueous solution, a white precipitate is obtained. This indicates the possible presence of.

Hydrogen is released during which reaction?

The kinetic equation of the reaction 2CO(g) + O2(g) —> 2CO2(g) + Q is

During the hydrolysis of salts, heat is absorbed, which means that the process is

If the pressure in the equilibrium system is lowered :CO2(g)+ C(s) —><— 2CO(g) -Q then

If a salt crystal is placed in a glass of an aqueous salt solution and the size of the crystal does not change over time it can be concluded that the solution is

What is substance X in the transition Ca(HCO3)2–>X—>CaO?

When the concentration of carbon monoxide doubles the rate of the chemical reaction 2CO(g)+ O2(g) —> 2CO2(g) +!Q

In which of the transitions is there a conversation that is NOT possible

Solutions of sulphuric acid and dipotassium sulphate can be distinguished by

Nitrogen is NOT characterised by interaction with

The simple substances of which of the listed chemical elements: A-Cooper, B-iron, C-silver D-aluminium, E-chrome, can react with concentrated sulphuric and nitric acid when heated?

Which electron subshell in the lanthanides is NOT completely filled

Which of the following oxides is the only anhydride of nitric acid?

The basic salts are obtained after

The acidic salts are obtained after

In what container can an aqueous solution of nickel sulphate be stored

What is the reaction of the medium of the aqueous solution of the salt NH4Cl:

Specify the colour of the flame of potassium salt

The hydrolysis constant (Kb) depends on:

Which of the numbers shown below has a value closest to the pH of a sodium base solution with a concentration of 10*-4 mol/l

Which answer consists of salts whose aqueous solutions have a pH close to neutral?

In the reaction: A+B+Q—><—C+D the formation of the products is accompanied by:

In the equilibrium system: N2(g)+3H2(g)—><—2NH3(g) at constant temperature

At a given temperature a saturated solution can become unsaturated when:

In the reaction: SO2(g)+ 2H2S(g)—>3S(s)+2H2O(l) the oxidising agent is

Which of the following interactions does NOT occur?

The process of dissolving concentrated H2SO4 in water is:

The speed of a homogeneous catalytic process depends on:

Which of the statements is false:

What is the electric charge of the pellet?

Which of the reactions will not produce hydroxide:

Which of the following statements is not true about catalysts:

The reaction products of an endothermic process:

In the presence of a catalyst, the chemical equilibrium shifts

How can the value of the degree of electrolyte dissociation (a) be increased for a solution of the weak electrolyte CH3COONa:

The rate constant depends on:

Which of the following statements is not true?