Acid, Base & Salt-2

35. ________ is used for making Vinegar. (A) Tartaric acid (B) Malic acid (C) Oxalic acid (D) Acetic acid Ans. (D) 36. Which of the following induces souring of milk? (A) Acetic

Acid, Base & Salt-1

1. Which of the following is the strongest acid? (A) CF3COOH (B) CBr3COOH (C) CH3COOH (D) CCl3COOH Ans. (A) 2. Which of the following is the weakest acid? (A) C6H5OH (B) CH3COOH

Redox Reactions

1. What happens in an Oxidation reaction? (A) Protons are lost (B) Electrons are lost (C) Neutrons are lost (D) Electrons are gained Ans. (B) 2. Wh ich among the fo llowing

Radioactivity & Nuclear Chemistry-2

42. The radiation that can penetrate deepest in our body (A) UV-radiation (B) Alpha-particles (C) -particles (D) Gamma-particles Ans. (D) 43. The isotope of Uranium used [in atomic reactors is (A) U235

Atomic Structure- 4

94. If r is the radius of first orbit, the radius of nth orbit of the hydrogen atom will be : (A) rn2 (B) rn (C) r/n (D) r2n2 Ans. (A) 95.

Atomic Structure-3

66. The photoelectric effect is described as the ejection of electrons from the surface of a metal when— (A) It is heated (B) It is placed in strong electric field (C) Electrons

Atomic Structure-2

33. Cathode rays are– (A) Stream of a-particles (B) Stream of electrons (C) Electromagnetic waves (D) Radiations Ans. (B) 34. When cathode rays strike a target of high atomic weight, they give

Atomic Structure-1

1. ‘Atomic theory’ of matter was given by (A) Avogadro (B) Dalton (C) Newton (D) Pascal Ans. (B) 2. Atomic size is of the order of— (A) 10–8 cm (B) 10–10 cm