Kimyo 8-sinf I chorak 10% nitrat kislota hosil qilish uchun 30%50g nitrat kislotaga qancha suv qo’shish kerak?

Kimyo 8-sinf I - Chorak
1. 10% nitrat kislota hosil qilish uchun 30%50g nitrat kislotaga qancha suv qo’shish kerak?

A) 100g B) 15g C) 70g D) 25g

2.Yer qobig’ida kremniy elementi necha foiz uchraydi?

A) 47% B) 27,5% C) 11,11% D) 5,7%

3.Аl sulfat eritmasi natriy karbonat eritmasi bilan ta’sirlashganda qanday moddalar hosil boladi?

A)Al(OH)₃ + CO₂ + Na₂SO₄ B)Al₂(CO₃)₃+ Na₂SO₄

C) Al (HCO₃)₃+ Na₂SO₄ D) Al (HCO₃)₃

4.71,45% metan va 28,55% C(II)-oksid tutgan 7,84m³ aralashmaning massasini toping

A) 6kg B) 6,8kg C) 7,2kg D) 4,3kg

5.Metallmaslarning elektrmanfiyligi kamayish tartibida joylashtiring

1.F 2.P 3.Cl 4.H 5.N 6.O

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