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For preparation of 500 g of hypertensive solution of the sodium chloride

with mass percent 10% must be taken:

• 0,150g NaCl

• 50g NaCl

• 150g NaCl

• 0,50g NaCl

Solubility of gases in water at the increase of temperature:

• Decrease

• Increase

• formation

. Solubility of gases in water at the increase of pressure:

• Increase

• Decrease

• Formation

A heterogeneous mixture containing dispersed particles that are heavy enough to

settle out under the influence of gravity is:

• Suspension

• Not suspension

Quantum number of an electron represents the main energy level or shell or orbit

to which the electron belongs:

• principal quantum number

• Magnetic quantum number

• spin magnetic quantum number

Which quantum number represents the subshell of orbital to which the electron is

associated?

• Orbital or azimuth quantum number

• Magnetic quantum number

• spin magnetic quantum number

Which quantum number represents the orbitals of a given subshell?

• Magnetic quantum number

• spin magnetic quantum number

• Orbital or azimuth quantum number

The direction of rotation of electrons about it axis is represented by:

• spin magnetic quantum number

• Magnetic quantum number

• principal quantum number

All elements of periodic system can be classified on s-, p-, d-, and f-electronic

families. Which of the specified elements belong only to p– electronic family

• Cl,S,N

• Fe,Cu,Au

• Zn,Na,Cl

For “M” main energy level the maximum number of electrons are:

• 18

• 2

• 32