1. Elektronining kvant sonlari n, 1, m,, m

ma'lum bo'lsa, suyak tarkibidagi kalsiyning. massa ulushini (%) Jiniqlang.

A) 14 B)8 C)21,33 D)10,67

29. Chumoli, sianid va karbonat kislotalarda uglerodning oksidlanish darajalarini yozing.

A) 0. +4, +4 B) +2. +2, +4

C) 0, +2, +4 D) +2, -f4, +2

30. 7 g natriy nitrat eritmasida 192,64-10²¹ ta kislorod bor. Ushbu eritma to'yinishi uchun 1,1 g tuz qo'shilishi kerak. Tuzning shu temperaturadagi eruvchanligini toping.

A) 108 B)125 C) 150 D)90

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