Basic Concepts MCQs 11

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A test from chapter 1 i.e Basic Concepts Chemistry part 1. This is Free online test for FSc and Entry test Preparation for UET, NUST, FAST, GIKI, PIEAS, NFC, Punjab University, UHS, other Engineering Universities and Medical Colleges.

1. ¹⁶O, ²⁴Mn, ²⁸Si, ⁴⁰Ca and ⁵⁶Fe make up of earth crust (%)

A) 25
B) 50
C) 75
D) 100

2. The pressure in torr of vapours in mass spectroscopy is kept

A) 10^-6 to 10^-7
B) 10^-5 to 10^-6
C) 10^-4 to 10^-3
D) None

3. 1 gm ion of carbonates (CO₃^-2) is

A) 64 g
B) 56 g
C) 60 g
D) 48

4. 44 g of CO₂ produced from one mole of Carbon and one mole of O₂ is called

A) Percentage yield
B) Actual yield
C) Yield
D) Theoretical yield

5. Which one is not the isotope of carbon?

A) ₆C¹²
B) ₆C¹³
C) ₆C¹⁴
D) ₆C¹⁵

6. Which molecular ions are more abundant in mass spectrum?

A) Cationic ions
B) Anionic ions
C) Halide ions
D) Alkali metal ions

7. What is the volume in cm_{3 of 3.01 x 10²³ molecules of O2 gas at S.T.P.}

A) 1000 cm³
B) 11000 cm³
C) 11212 cm³
D) 22.4 cm³

8. The empirical formula of glucose is

A) CH
B) CH₂O
C) C₆H₆
D) CHO

9. The S.I units for energy are

A) Joule
B) Calorie
C) Kelvin
D) Candela

10. Which of the following salts will have greater positive charges in its 1 molar aqueous solution?

A) Ca (OH)₂
B) KOH
C) NH₄OH
D) NaOH