Kimyo 8-sinf i-variant

Reaksiya tezligi yana avvalgi qiymatga (v₀) ega bo’lishi uchun bosim qanday o’zgarishi kerak?

A)2 marta oshadi B) 4 marta kamayishi C) 8 marta ortishi D) 16 marta kamayishi

10. 4,16 g. ikki valentli metal oksidi 191, 04 g suvda eritilganda hosil bo’lgan moddalarning massa ulushi 2, 5 % ni tashkil qilsa, metallni toping.

A) Sr B) Ca C) Mg D) Ba

11. Qaysi kislotalardan nordon tuz olish mumkin? 1) xlorid 2) nitrit 3) sulfid 4) ortofosfat 5) yodid 6) karbonat 7) sulfit

A) 2,3,5,6 B) 3,6,7 C) 1,3,4,5 D) 3,4,5,6