Tasdiqlayman” S. Boltayev Kimyo fanidan yakuniy nazorat testlari

b)natriyning uchuvchan tuzlari rangsiz alangani sariq rangga bo’yaydi
c)natriyning uchuvchan tuzlari rangsiz alangani qizil rangga bo’yaydi
d)natriyning uchuvchan tuzlari rangsiz alangani ko’k rangga bo’yaydi
15.Temir kationi Fe⁺² ga xos reaksiyalarni ko’rsating?
1)Ammoniy sulfide yordamida Fe⁺² ni qora rangli temir sulfide sifatida cho’ktiriladi:
1)FeCI₄+H₂SO₄=FeSO₄+2HCI
2)FeSO₄+BaCI₂=BaSO4 +FeCI₂
3)FeSO₄+(NH₄)₂S=FeS +(NH₄)₂SO₄
4)FeSO₄+2KOH=Fe(OH)₂ +K₂SO₄
5)2FeCI₃+3(NH₄)₂S=Fe₂S₃ +6NH₄CI
a)1, 2 b)3, 4 c)4, 5 d)1, 3
16.Xrom Cr+3 kationiga xos reaksiyani ko’rsating.
a)Cr+2HCI=CrCI₂+H₂
b)CrCI₃+3NaOH=Cr(OH)₃ +3NaCI
c)2CrCI₃+3H₂SO₄=Cr₂(SO₄)₃+6HCI
d)2Cr₇CI₃+(NH₄)₂S=Cr₂S₃ +6NH₄CI
17.Kumush kationi Ag⁺ ga xos reaksiyalarni ko’rsating.
1)AgNO₃+HCI=AgCI+HNO₃
2)AgNO₃+2KOH=Ag₂O+H₂O+2KNO₃
3)2Na₂HPO₄+3AgNO₃=Ag₃PO₄ +3NaNO₃
a)2, 3 b)1, 2, 3 c)3, 4 d)1, 2
18.Qadim zamonlarda odamlar nechta metallni bilishgan.
a)7 ta; Au, AI, Cu, Fe, Sn, Pb, Hg b) 7 ta; Au, Ag, Cu, Fe, Sn, Pb, Hg c)8 ta; C, Zn, Fe, Au, Sn, Pb, Na, Ca d) 9 ta Au, Fe, C, Zn, Ag, P, AI, Sn, Cu
19.Odam va hayvon suyaklari, tishlari asosini tashkil etuivchi element qaysi?
a)F4 b)F2 c)Ca d)Mg