General Science MCQ – 11 (Chemistry)

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1. According to Bohr Theory, which of the following transitions in the hydrogen atom will give rise to the least energetic photon?
(A) n = 7 to n = 5
(B) n = 6 to n = 5
(C) n = 6 to n = 4
(D) n = 7 to n = 4

2. Consider a 3dxz orbital. Which of the following statements is incorrect?
(A) The xy plane divides the electron probability distribution into two identical mirror-image halves
(B) The yz plane divides the electron probability distribution into two identical mirror-image halves
(C) The nucleus is located at a node
(D) The xz plane is a nodal surface

3. The electronic configuration of the element whose atomic number is 26 is?
(A) 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁶
(B) 1s³ 2s³ 2p⁶ 3s² 3p⁶ 4s² 3d⁶
(C) 1s² 2s² 2p⁶ 3s³ 3p³ 4s² 3d⁶
(D) 1s² 2s³ 2p⁶ 3s² 3p⁷ 4s² 3d⁶

4. In Bohr’s model of the hydrogen atom, the radius of an orbit?
(A) It is smallest for the lowest energy state
(B) It is smallest for the highest energy state
(C) is proportional to n²
(D) All of the above

5. Which of the following statements about periodic properties is incorrect?
(A) Atomic size increases to the right across a period
(B) Atomic size increase down a group
(C) Atomic size increase top a group
(D) Ionization energy increases to the right across a period

6. The metal used to recover copper from a solution of copper sulphate is?
(A) Ag
(B) Fe
(C) Na
(D) Hg

7. The ore which is found in abundance in India is?
(A) Monazite
(B) Magnetite
(C) Monazite
(D) None of these

8. Which of the following is used to control the inherited traits of an organism?
(A) DNA molecules
(B) RNA molecules
(C) Nucleotides
(D) All of the above

9. The heat energy produced when the human body metabolisms 1 gram of fat is?
(A) 40 KJ
(B) 39 KJ
(C) 30 KJ
(D) 29 KJ

10. What are the number of moles of CO2 which contains 16g of oxygen?
(A) 0.3 mole
(B) 0.2 mole
(C) 0.1 mole
(D) 0.5 mole

General Science MCQ – 152 (Biology)