1. Who fully explains the essence of isomerism? *A butlerov b bersellius

12-variant

1. Who fully explains the essence of isomerism?

*A) Butlerov B) Bersellius
C) Mendelleyev D) Dalton
2. Arrange the items in ascending order of purity?
1) technically clean; 2) special clean; 3) chemically pure; 4) clean for analysis; 5) pure clean;
A) 1,2,3,4,5* B) 1,5,4,3,2 C) 1,2,3,4,5 D) 1,3,4,5,2
3. NaOH + H3PO4 = Na3PO4 + H2O Equate the following reaction and calculate the sum of the coefficients?
*A) 8; B) 10; C) 9; D) 15;
4. Find the substance formed after the reaction Na + O2 = *?
A) Na2O; B) NaOH; C) H2O;* D) Na2O2
5. Fe3 [Fe (CN) 6] 2 Determine the line given the molar mass of matter?
*A) 592; B) 560; C) 480; D) 600;
6. Who was the first to introduce the theory of the structure of organic matter?
A) Mendeleev 1869 B) Kolbe 1845
*C) Butlerov 1861 D) Kekule 1857
7. How many molecules of gas are released from the decomposition of 200 g of CaCO3?
A) 6.02 * 1023 B) 18.06 *1023
C) 9.03 *1023 * D) 12.04 * 1023
8. C2H5OC2H5 ,, Who first synthesizes the anesthetic ether?
A) Kekule and Cooper; *B) Jackson and Marton;
C) Völler and Libi* D) Kekule and Kolbe
9. How many (n.sh.l) liters of gas are released when NaH and 36 g of water are e*posed?
A) 22.4l H2 B) 33.6l H2 *C) 44.8l H2 D) 67.2l H2
10. Find the mass gr of one molecule of nitrogen?
A) 14 gr; *B) 46.5 * 10-24;
C) 28 gr; D) 2.32 * 10-23
11. What is an object of chemistry?
a)* a matter b) reaction c) element d) salt

12. Who make up a periodic system?

a) Lomonosov b) Rezerford
c)* Mendelev d) Dalton
13. How many groups in periodic system?
a) 8* b) 7 c) 10 d) 6
14. What families in periodic system?
a) s,p,d,f * b) s,p,d c) here is not….. d) K, Na, Mg
15. O*ygen what kind of element?
a) methane b) * it is not methane c) half methane d) radioaktiv
16. What is NaCl?
a) * salt b) acid c) base d) gas
17. Find halogens?
a) H₂, Cl₂, Br₂ b) O₂, Br₂, N₂ c) *Cl₂, Br₂, F₂ d)H₂, O₂, J₂
18. What is H2SO4?
a) salt b) * acid c) base d) alcohol
19. Find the elements of S-family
a) K, Mg, Fe b) O, Cl, F c) Al, P, S d) * H, He, Na
20. How many periods in periodic system?
a) 3 b) 4 c) * 7 d) 8
21. raincoat A. palto * B. plash C. ko`ylak D. sharf
22. thunder *A. momaqaldiroq B. do`l C. shamol D. bo`ron
23. afraid A. *ursand B. xafa *C. qo`rquv D. qo`rqinchlik
24. beach A. daryo *B. sohil C. ko`l D. sohilda
25. swimming *A. cho`milish B. cho`milmoq
C. cho`mildi D. suzish
26. COLUMN * A) ustun B) dalil C) manba D) voqea
27. MI*TURE *A) aralashma B) tayyor mahsulot C) qurol D) voqea
28. REVIEW * A) maqola, takrorlamoq B) hujjat C) dalolatnoma D) voqea
29 HUNTER * A) ovchi B) ochlik
C) kinoya D) voqea
30. PRIVATE A) odatiy * B) xususiy
C) sirli D) xavf