8-sinf uchun kimyo fanidan test 1-v Tarkibida 67. 98 metan va 32. 02 uglerod (II) – oksid bo`lgan 96 m

10. Malaxit formulasini aniqlang.
A) Cu(OH)₂*CuCО₃ B) Cu(H₂PO₄)
C) CuSO₄*6H₂O D) Cu(NO₃)₂*HCl
11. Qaysi olim kimyoviy elementlarning lotin xarflarning 1 va 2 xarfi bilan nomlanishini taklif etgan?
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12. Bertole tuzidan kislorod olish reaksiyasini yozing.
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13. Gaysi gaz tabiiy gaz hisoblanadi?
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14. K₂Cr₂O₇ tarkibidagi xromning oksidlanish darajasini aniqlang.
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15. Cu + 4HNO₃ = Cu(NO₃)₂ + 2NO₃ + 2H₂O ushbu tenglamadagi oksidlovchini aniqlang.
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8-sinf uchun kimyo fanidan test 2-v
1. Reaksiyaning tezlik koeffitsenti 2 ga teng bo`lganda harorat 70 <sup>0</sup>C dan 110 <sup>0</sup>C ga ko`tarilsa , reaksiya tezligi necha marta ortadi. Ushbu reaksiya dastlabki haroratda 3 minut 45 sekuntda tugaydigan bo`lsa ,keyingi haroratda qancha vaqtda tugaydi ?

1. 
   14 sekund
   
2. 
   9 sekund
   
3. 
   15 sekund
   
4. 
   30 sekund
   

2. 90 g ohaktosh qattiq qizdirilganda 34 g CaO olindi. Ohaktosh tarkibida necha foiz CaCO₃ bo`lgan?

1. 
   78.6 %
   
2. 
   67.4 %
   
3. 
   54.2%
   
4. 
   48.6 %