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8-sinf Kimyo olimpiada №3

Yanvar 3, 2023

45 Ko'rishlar 0

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8-sinf Kimyo olimpiada №3

30.12.2022 yil oo.uzedu.uz

Online olimpiada savollari!

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+2zaryadli ion hosil qiluvchi metaldan yasalgan va massasi bir xil ikkita plastinkaning birini mis (II)xlorid eritmasiga , ikkinchisini kumush nitrat eirtmasiga tushurib qo’yiladi . Bir oz vaqt o’tgandan keyin mis(II)xlorid eritmasiga tushurilgan plastinkaning massasi 0.02% ga kamaydi , ikkinchi plastinkaning massasi esa 4 % ortdi . Mis (II) xlorid va kumush nitratning molyar konsentratsiyalar bir xilda kamaydi. Metalni aniqlang.

Zn

Cd

Fe

Cr

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18g temir(II)-gidroksid parchalanganda qancha gramm temir(II)-oksid va suv hosil bo’ladi?

14,4g; 1,8g

3,6g; 14,4g

14,4g; 3,6g

4,5g ;7,2g

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C

D

A

B

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B

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A

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B

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B

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B

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B

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A

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C

B

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