ECAT Chemistry Basic Concepts Test Online

Chemistry Basic Concepts MCQS Online Test

ECAT Chemistry Basic Concepts Chapter Online Test

Total Questions: 71
Time Allowed: 30 Minutes
Total Marks: 71
How to Attempt Test: Please choose the right Option in MCQ-type question.
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ECAT Chemistry Basic Concepts Test

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1. The volume occupied by 28 gram of N₂ at STP?

2. Most atoms are neutral, to become a positive ion the atom must:

3. What is the net charge on ferrous ion?

4. Which of the following represents an element?

5. How many moles of KBrO₃ are required to prepare 0.0700 moles of Br₂ according to the reaction: KBrO₃ + 5KBr + 6HNO₃ → 6KNO₃ + 3Br₂ + 3H₂O

6. Calculate the number of moles of CaCO₃ (Formula weight = 100) in a sample that weighs 25.0 grams.

7. An anhydrous salt of copper is found to contain 52.7% chlorine and 47.3% copper by mass. What is the empirical formula for this salt?

8. An oxide of nitrogen contain 36.8% nitrogen and 63.2% oxygen by mass. Calculate its empirical formula.

9. What is a multivalent ion?

10. Calculate the weight, in grams, of one molecule of carbon dioxide, CO₂.

11. Balance the following equation using minimum integral coefficients: (NH₃ + O₂ → NO₂ + H₂O) Find the stoichiometric coefficient for oxygen gas O₂:

12. The modern atomic weight scale is based on

13. Indicate the incorrect statement form the following

14. The empirical formula of a compound is CH₂O and its molecular mass is 120. The molecular formula of the compound is

15. Bromine has two isotopes having the relative abundances as ⁷⁵₃₉Br = 50.51% and ⁸¹₃₅Br= 49.49%. The average atomic mass of bromine is

16. If the empirical formula of compound is CH₂. Which of the following is true about its molecular formula?

17. What is the percent water in hydrated calcium chloride (CaC1₂ 2H₂O)?

18. What are the two different types of ions?

19. Which of the following is an element?

20. If Na is Avogadro’s number, then number of valence electrons in 4.2 g of nitride ions N³¯ is

21. Which law directly explains the law of conservation of mass?

22. The hydrogen phosphate of certain metal has formula MHPO₄. The formula of metal chloride would be

23. Molecular compounds can be found in all three states of matter at room temperature. Which molecule compound is a liquid at room temperature?

24. The Number of oxygen atoms in 4.4 g of CO2 is approximately

25. One of the substances is used to absorb CO₂ gas in combustion analysis. Which is that substance?


 

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22 Comments

  1. The relative atomic mass of chlorine is 35.5. What is the mass of 2 moles of chlorine gas?
    chlorine gas has 2 atom so, the mass of two moles of chlorine gas is 142 not 71

    1. Sir please ap bta skty Hain k ma apni entry test ki tyari Ghar ma rah kr kis tareeky say kr skti ho. Please guide me

  2. A few questions don’t make any sense with their choices, not to mention that broken/wrong answers to them are also there. For instance, the question where 2 moles of Cl2 gas are asked. The answer is 142g however the answer, set by the creator of these tests, is 71g. Apart from that, the test is quite helpful.

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