1
Osh tuzining kimyoviy formulasi qaysi?
- ANaNO₃
- BKCl
- CNaCl
- DCaCO₃
Show the answer and explanation
Correct answer: C
Osh tuzi — natriy xlorid, NaCl. CaCO₃ — bo‘r (ohaktosh).
Milliy sertifikat · Chemistry
Chemistry tests - every mistake explained.
30-question papers, the exam's timer and a result as a percentage with an estimated grade. Your result page shows which topics you miss most.
In the Trylab bank: 1 test · 30 questions · 1 free
30 questions · 60 minutes
Every paper has 30 questions and an exam-style timer.
A+ to C
Your percentage becomes an estimated grade: A+ ≥ 70%, A ≥ 65% and so on.
Every question explained
A worked solution or a short explanation - not just right or wrong.
Question types
The questions in our bank - by type and count.
- Moles and calculations5 questions
- Organic chemistry5 questions
- Chemical reactions4 questions
- Inorganic compounds3 questions
- Solutions3 questions
- The periodic law2 questions
- Atomic structure2 questions
- Metals2 questions
- Non-metals2 questions
- Chemical bonding1 question
- Oxidation states1 question
Sample questions
From our free tests - with the answer and the explanation.
2
200 g eritmada 20 g tuz erigan. Tuzning massa ulushi qancha?
- A11%
- B20%
- C10%
- D9%
Show the answer and explanation
Correct answer: C
ω = m(tuz) / m(eritma) · 100% = 20 : 200 · 100% = 10%. Erituvchi massasiga (180 g) bo‘lish xato.
3
Lakmus kislotali muhitda qanday rangga kiradi?
- Abinafsha
- Brangsiz
- Cko‘k
- Dqizil
Show the answer and explanation
Correct answer: D
Lakmus kislotali muhitda qizil, ishqoriy muhitda ko‘k, neytral muhitda binafsha rangda bo‘ladi.
Preparation tips
- 01
Start with one timed paper - that's your baseline.
- 02
Use the topic breakdown on your result to find your weakest topic.
- 03
Read the explanations for your mistakes and redo that topic two or three days later.
- 04
Keep to time: about 2 minutes a question.
- 05
Check uzbmb.uz for official requirements and format changes.
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FAQ
Does the chemistry test match the official exam?
The questions are original material based on the school curriculum and Milliy sertifikat topics. The official format can differ by subject and year - Trylab's result is an estimate.
How is the grade calculated?
From your percentage: A+ ≥ 70%, A ≥ 65%, B+ ≥ 60%, B ≥ 55%, C+ ≥ 50%, C ≥ 46%. It's an estimate; the official certificate may be scored differently.
Is there a free paper?
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