Grams of solute per mililiter of solution

The oxidation number of N in NaNO2 is:

+3

In which of the following compounds is the bonding most covalent?

F2

The elements in group 1A of the periodic table are called:

Alkali metals

The elements in group IIA of the periodic table are called:

Alkaline earths

The bond in hydrogen chloride is which of the following types? Is it:

Polar covalent

The bond in Fluorine is which of the following types? Is it:

Nonpolar covalent

The process of conversion of solid into vapour directly is known as:

Sublimation

The first law of thermodynamics is also known as:

Law of conservation of energy

The total charges before and after the reaction is conserved. This relation is given by:

Law of conservation of atomic number

The factors on which the rate of reaction depends is:

All of these

The rate of reaction depends upon the molar concentration of reactants which:

Keep on decreasing with passage of time

The role of catalyst in a chemical reaction is to change:

Activation energy

The ionic reactions are very fast because:

It does not involve bond breaking

The catalyst used for heterogeneous catalysis is:

Solid

The value of Ebullioscopic constant or boiling point elevation constant depends on:

Nature of solvent

The value of Vant Hoff factor (i) = 2 is for:

Sodium chloride

The value of Vant Hoff factor (i) = 1 is for:

Glucose

The molarity of 4.6 N H2SO4 solution is:

M

The ratio of elevation in boiling point to molality of solution is known as:

Molal elevation constant

The quantity of electricity required to liberate or deposit 1 gram equivalent of a substance from its solution during electrolysis is known as:

Faraday

The constitute of a Danlell cell is:

Zn - Cu cell

The chemical equivalent of the metal is 19.3. When 3A of electric current is passed for 50 min. What will be the amount of metal deposited from an electrolyte?

G

The dissociation and ionization are partically same as both results in giving …………… of the substance.

Both free cations and anions

The degree of dissociation (a) does not depend upon:

Pressure

This type, of corrosion occurs due to direct chemical attack of environment or atmospheric gases like oxygen halogens, hydrogen sulphide, sulphurdioxide, nitrogen or anhydrous inorganic liquid with metal surfaces in immediate proximity. What is the corrosion type?

Chemical corrosion

This type of corrosion occurs when the metal comes in contact with a conducting liquid or when two dissimilar metals are immersed or dipped partly in a solution. There is the formation of a galvanic cell on the surface of metals. Some parts of the metal surface act as anode and rest act as cathode. Water must be present to serve as a medium for the transport of ions. What is the corrosion type?

Electrochemical corrosion

The reaction of the salt with water, whereby the salt is dissociated and decomposed to form a weak electrolyte is called ……………

Hydrolysis

Using IUPAC norms write the formula for the following: Hexaamminecobalt(III) sulphate

 [Co(NH3)6]2 (SO4)Use the activity series given to you to determine which of the following reactions will NOT take place:Cu + HCl -->

Unit of molarity is:mol / litre

Vant-Hoff rule is described by following equation:

 

Variation of chemical elements that have the same number of protons but different number of total neutrons is known as:

Isotopes

What is the equivalent weight of the compound Ca3(PO4)2 (g-eq/mol)? Name it

  51,6 (calcium phosphate)

 

What is the equivalent weight of the compound Fe(OH)3 (g-eq/mol)? Name it

 35,6 (trihydroxide iron)

What is the equivalent weight of the compound PbO2 (g-eq/mol)? Name it4)

 59,75 (lead dioxide)

What is the equivalent weight of the compound H3PO4  (g-eq/mol)? Name it4

 32,6

What is the equivalent weight of the compound   Al2(SO4)3  (g-eq/mol)? Name it

 57 (dialuminium trisulfate)

What is the equivalent weight of the compound Na2SiO3 (g-eq/mol)? Name it

 61 (disodium silicate)

What is the equivalent weight of the compound MnO3 (g-eq/mol)? Name it

 17,16 (manganese trioxide)

What is the equivalent weight of the compound NH4ОН (g-eq/mol)? Name it

 35 (ammonium hydroxide)

What is the eqiuvalen weight of compound Н2SO4  (g-eq/mol)? Name it

 49 (sulfuric acid)

Write down the law of mass action for the given direct reaction:

V = k [O2]

"When a system at equilibrium is subjected to change in concentration, temperature, volume, or pressure, then the system readjusts itself to (partially) counteract the effect of the applied change and a new equilibrium is established" This definition conforms to the law:

Le Châtelier's principle

Write down the law of mass action for the given direct reaction:

V= k[C O2 ]2

When the pressure increases and the concentration of hydrogen in the system:   , the equilibrim will be shifts to ............

to right

When the temperature and the concentration of ammonium increases in the system:  (∆H<O) , the equilibrim will be shifts to ............                                         

To left

What is the osmotic pressure, in kilopascal of 0,1M benzene  solution at Celsius?

251,9kPa   

What is the osmotic pressure, in atmospheres of 2M ethanol solution at Celsius (R=0,082 L atm/mol K)?

44,772 atm

 

What is the boiling point elevation of 2m formalin aqueous solution (ЕН2О= 0,52˚C)?

1,04˚ С       

What is the freezing point of 1m glycerol  aqueous solution (КН2О=1,86˚)?

-1,86˚ С     

What is the heat of reaction:        :

                 -264,45 0 0 -393,5

-135,4 кДж / моль       

 

What is the enthalpy change of the reaction:

                                    +763  0    0 -786

-2335,0 кДж / моль

 

What is the entropy change of the reaction (J/mol*K):

                                6        131 33    131

+27,0 Дж / моль * град

 

What is the change in Gibbs energy of reaction:               

D G298 kL/mol      -244,30 -137,15 0 -393,37

-11,92 кДж / моль

Which salt is hydrolyzed by cation?

ZnCl2

What salt is not hydrolyzed?

BaCl2

What salt aqueous solution will have alkaline medium (pH>7)?

К2S

Which salt is hydrolyzed by anion?

CH3COONa

Where does the acid base indicator - litmus gain of red colour?

CuCl2

Where does the acid base indicator phenolphthalein gain of crimson (purple) colour?

Na2 С O3

Weak basis and weak acid that form salt XA, if such ionic - molecular equation X+ + A- + H2O = XOH + HA correspond to its hydroysis. What salt is it?

NH4NO2

What is the pH value of the solution, with a content of [OH-] = 10-3 mol /L?

 11

What is the pOH of the solution, with a content of [H+] = 10-4 mol /L?

 10

What kind of water is obtained by passing the natural water through a system of cation and anion exchangers:

distilled water

What is the total hardness of water (mmol/L), if its 1 liter contains 40,04 mg of calcium (Ca2+) ions and 48.24 mg magnusium (Mg2+) ions?

6

Water hardness is characterized by the presence of dissolved salts of calcium and magnesium bicarbonates, called...

temparary hardness

What is the temporary hardness of water, if for titration of 100 ml of water was consumed 5.65 mL of 0.02 N hydrochloric acid solution (mmol / L)? 1,13         

What is the total hardness of water, if for titration of 50 ml of water was consumed 2.5 ml of 0.025 N solution of EDTA (mmol / L)?

1,25       

What is the electrode potential of a half cell consisting of zinc electrode in 0,01М ZnCl2 aqueous solution at 25°C :

-0,819 В

What will be the electrode potential at an aluminium electrode, dipped in a 0,001М AlCl3 aqueous solution at 25°C :

-1,719 В          

What the metal cations will be recovered from their salt solutions by iron?

Sn, Pb       

What the metal cations will be recovered from their salt solutions by magnesium?

Zn, Mn         

What metals will react with diluted acids, as HCl and H2SO4, and produce hydrogen gas?

Al, Zn       

What metals will not react with diluted acids?

 Pt, Au                

Which of the following metal ions will discharge first at electrode?

 Ag+ (E ° = +0,80V)

Which of the following metal ions, as Al3+, Na+, Mg2+, Ag+, will discharge first at electrode during molten electrolysis?

  Ag+, Al3+, Mg2+, Na+,

Which metals will serve as the anode for lead?

Cr, Ni       

Which metal will serve as the cathode for iron?

Cu, Ni

Which metals acts as a protector for the iron and steel constructions?

 Zn, Mg               

When the value of the electrode potential of the metal increases in the electrochemical series, we observe that .....

 reducing ability of the metal cation increasesWhat is the oxidation state of the central metal atom in the complex [Cu(NH3)4]SO4 :

 +2

What is the oxidation state of the central metal atom in the complex Na2[Co(NH3)2Cl4] :

 +2

What is a name this compound NaH2PO4?

sodium dihydrogenphosphate

Which group contains only the salts?

 KBr, Na2SO4, FeCl3, CaCl2

What is the oxidation state (OS) of the central metal atom and the coordination number (CN) in the complex [Co(NH3)5 Cl ]Cl ? Name it

 OS = +2, CN = 6. Pentaaminochloridocobalt (II) chloride

What is the oxidation state (OS) of the central metal atom and the coordination number (CN) in the complex Na3[Co(H2O)2Cl2PO4] :

OS =+2; CN = 5

Who is the author of this law?

 Raoult‘ s 2nd law:

What is the molarity of 400 ml of a solution wherein dissolved 20g barium chloride BaCl2 (mol/L)?

0,240 М     

What net ionic equation is corresponds to a given molecular reaction?

Ba2+ +2OH- +2H+ + SO42- →BaSO4+2H2 О         

What net ionic equation is corresponds to a given molecular reaction?

2H+ + S2- → H2S

Which net ionic equation is corresponds to a given molecular reaction?

Al3+ + 3OH- =Al(OH)3                 

What pair of substances will interact with greater velocity if it is known, that concentrations of solutions of acids in all cases are equal?

 Mg and HCl

What is Van’t-Hoff factor for KCl in aqueous solution?

 2

What is Van’t-Hoff factor for Na3PO4 in aqueous solution?

 4

Why it is advised to add ethylene glycol to water in a car radiator while driving in a hill station?

 As an antifreeze to lower the freezing point of water

What is the expected Van’t Hoff’s factor ‘i’ value for K3[Fe(CN)6] ?

 4

Write down the IUPAC name for each of the following complex [Co(NH3)5Cl]Cl2 and indicate the oxidation state and coordination number.

 Pentaamminechloridocobalt (III) dichloride. Oxidation state of Co = +3; Coordination number = 6

What is the percent of MgCl2 by mass in a 0,01M salt solution that has a density of 1,09g/ml?

 0,087%

Which of the following scientists was awarded the Nobel Prize in 1911 for the discovery of the radioactive elements, radium and polonium?

Marie Curie

Which of the following terms refers to the number of molecules or ions attached to a central metallic atom?

Coordination number

Which of the following pairs do NOT show similar chemical properties?

Fluorine-argon

Which of the following is NOT a general property of hydroxide bases in aqueous solution?

High solubility

 

Which of the following concentration expressions is defined as the number of moles of solute per kilogram of solvent:

Molality

Which of the following concentration expressions is defined as the number of moles of solute per liter of solution:

Molarity

Which of the following reactions involve NEITHER oxidation nor reduction?

Дата: 2018-12-28, просмотров: 64.