General Science MCQ – 61 (Chemistry)

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1. Elements X and Y combine to form two compounds XY and X₂Y. Find the atomic weight of X and Y, if the weight of 0.1 moles of XY is 10g and 0.05 moles of X₂Y is 9g?
(A) 30, 20
(B) 80, 20
(C) 60, 20
(D) 20, 30

2. Which one will have the maximum numbers of water molecules?
(A) 18 molecules of water
(B) 1.8 grams of water
(C) 18 grams of water
(D) 1.8 molecules of water

3. The number of atoms present in 0.1 moles of a triatomic gas is?
(A) 1.806 x 10²³
(B) 1.806 x 10²²
(C) 3.600 x 10²³
(D) 6.026 x 10²²

4. Find the volume of O2 required to burn 1 L of propane completely, measured at 0o C temperature and 1 atm pressure?
(A) 10 L
(B) 7 L
(C) 6 L
(D) 5 L

5. A gas X has Cp and Cv as 1.4, at NTP 11.2 L of gas X will contain ____ number of atoms?
(A) 1.2 X 10²³
(B) 3.01 X 10²³
(C) 2.01 X 10²³
(D) 6.02 X 10²³

6. Which of the species is not paramagnetic?
(A) As⁺
(B) Cl^–
(C) Ne2⁺
(D) Be⁺

7. Pressure has the same dimension as?
(A) Energy per unit volume
(B) Energy
(C) Force per unit volume
(D) Force

8. A container has an equal mass of H₂, O₂, and CH₄ at 27^o C, the ratio of their volume is?
(A) 16:8:1
(B) 8:1:2
(C) 16:1:2
(D) 8:16:1

9. There are two chlorides of sulfur S₂CI₂. What is the equivalent mass of S in SCI₂?
(A) 64.8 g/mole
(B) 32 g/mole
(C) 16 g/mole
(D) 8 g/mole

10. Boron exists as two stable isotopes; ¹⁰B(19%) and ¹¹B(81%). Find out the average atomic weight of boron in the periodic table?
(A) 10.0
(B) 11.2
(C) 10.2
(D) 10.8

General Science MCQ – 60 (Biology)