kimyo sinovi test savollari

7-sinf chsb-2 2-variant 1.(b) quyidagi qaysi element 3-davr va iva guruhga tegishli? a) si b) c c) o d) na 2.(b) natriy sulfat (na₂so₄) birikmasida oltingugurtning valentligi nechaga teng? a) 6 b) 2 c) 3 d) 4 3.(b) kislorodning agregat holati oddiy sharoitlarda qanday bo‘ladi? a) qattiq b) gaz c) suyuq d) qaynoq 4. (q) havodagi asosiy gaz qaysi? a) kislorod b) azot c) karbonat angidrid d) ozon 5. (q) quyidagi reaksiya tenglamasida 2h₂ + o₂ → 2h₂o kislorodning koeffisiyenti nechaga teng. a )1 b) 2 c) 3 d) 4 6. (q) viia guruh elementlari qanday nomlanadi? a) ishqoriy metallar b) galogenlar c) inert gazlar d) o‘tkir metallar 7. (q) 1 mol magniyda qancha atom mavjud? a) 6,02 × 10²³ …

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