7-sinflar uchun kimyo fanidan test savollari. Iii-chorak uchun 1-variant

9.Davriy qonunni kim kashf qilgan?

A)D.Mendeleyev B)M.Lomonosov C)M.Butlerov D)Franklend

10.Alyuminiyning tartib raqami 13 ga teng.Uning atomida nechta proton (p)va electron (e) bor?

A)14p,12p B)13p,13e C)26p,13e D)14p,26e

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12.Oksidlanish darajasi nima?

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13.Gidroliz so’zini ma’nosi nima?

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14.Dissotsiatsiyalanish darajasi qanday harf bilan belgilanadi?

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15.Oksidlanish-qaytarilish reaksiyasi deb nimaga aytiladi?