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. What do you call pure substances that are formed from the attraction between positive ions and negative ions?

2. What is the net charge on ferrous ion?

3. Which of the following statements is wrong about isotopes?

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

5. What are the ratios among the volumes of gases of ³²O₂,²H₂, and ¹⁶CH₄ if equal mass of each gas is taken?

6. Which of the following is NOT a pure substance?

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

8. The modern atomic weight scale is based on

9. What are the parts of an atom?

10. 1 mole of CH₄ contains

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

12. Vapor density of a gas is 22. What is its molecular mass?

13. How many number of ions are there in 98 grams of sulphate ions?

14. Diameter of an atom is in the range of

15. Which one of the following is ambiguous?

16. 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,

17. To differentiate between C-12, C-13 and C-14, the instrument that you would use is

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

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

20. Since atoms are neutral, the number of electrons is equal to the number of:

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

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

23. Which of the following could be an empirical formula?

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

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


 

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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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