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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Chemistry

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

2. Copper (II) oxide is mixed with organic compound during combustion. The purpose is

3. What is a chemical compound?

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

5. How many moles of Helium gas occupy 22.4 L at 0°C at 1 atm. Pressure?

6. Which of the following method is used to estimate oxygen in an organic compound?

7. The coefficient of viscosity η of a fluid moving steadily between two surfaces is given by the formula, f = η dV/dx where f is the frictional force on the fluid. A is an area in the fluid and dV/dx is the velocity gradient inside the fluid at that area. The S.I. unit of viscosity coefficient η is given as,

8. How many moles of CO₂ are present in 220 mg?

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

10. Irrespective of the source, pure sample of water always yields 88.89% mass of oxygen and 11.11% mass of hydrogen. This is explained by the law of

11. Water (H₂O) is a common compound made up of:

12. The empirical formula of the compound having 50% sulphur and 50% oxygen by mass is

13. Which of the following is a pure substance made up of two or more types of atoms or elements?

14. Ayesha required an aqueous solution of sodium chloride. She made the solution by dissolving salt in:

15. What is the net charge on ferrous ion?

16. 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?

17. How can you separate the mixture of two gases of different atomic masses?

18. How will you separate a mixture of two gases?

19. What is correct relationship between empirical and molecular formulas?

20. Which one of the following is ambiguous?

21. What are the two different types of ions?

22. The compound having highest percent of oxygen is

23. Among the following pairs, the one which illustrates the law of multiple proportions is

24. A gaseous mixture contains 50% helium and 50% methane by volume. What is the percent by weight of methane in the mixture?

25. A compound contains 6.0 g of carbon and 1.0 g of hydrogen. The percent composition of the compound is:


 

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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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