Chemistry 10+2 Answer key download here
10+2 Chemistry Paper held on 22 February 2023 see the answer
(i) What are the functions of enzymes?
Answer: Enzymes are effective catalysts ,that catalyse numerous reactions.
(ii) What are enzymes?
Answer : Enzymes are complex nitrogenous organic compounds
(iii) What are co-enzymes?
Answer: When small m-protein is present along with enzyme it is called co-enzymes
(iv) What is poison?
Answer: Like Ordinary catalyst, enzymes are also inhibited by certain substances which are known as Poison.
(v) What is biochemical catalysis?
Answer: The enzymes are termed as biochemical catalysis.
True/False (vi to x)
(vi) Aliphatic aldehydes show position isomerism. False
(vii) The chemical substances used for the treatment of stress and minor disorders of the mind are called tranquillizers. True
(viii) PVC is an addition polymer. True
(ix) Hormones are chemical substances which are not produced in the body. False
(x) Benzylamine is more basic than aniline. True
(xi)Buna-S is obtained by the polymerization of butadiene and:
Answer : a) Styrene
(xii) Artificial sweetening agent is:
Answer:d) Saccharin
(xiii) The solids which allow the passage of electric current are:
Answer : a) Conductors
(xiv)The molarity of pure water (density of water = 1 g /L) is:
Answer : b) 55. 55 M
(xv) The ideal solution has:
Answer a) : Δmixing H=0
(xvi) Which of the following is independent of temperature?
Answer : a) Molality
(xvii) Rust is a mixture of:
Answer : d) Fe2O3 AND Fe(OH)3
(xviii) Which of the following is not tetrahedral in shape?
Answer: a) SF4
(xix) Which of the following is the strongest acid?
Answer : d) H2Te
(xx) Which of the following is a hexadentate ligand?
Answer : (b) EDTA
xxi
Answer : c) +3
(xxii) Phenol is less acidic than
Answer: (d) o-nitrophenol
(xxiii) Which of the following is most acidic?
Answer: a) CF3COOH
(xxiv) lodoform test is not given by:"
Answer :c) Pentan-3-one
(xxv) The gas evolved when methylamine reacts with nitrous acid is:
Answer: (b) N2
(xxvi) Acid anhydrides on reaction with primary amines give:
Answer : (a)Amide
(xxvii) Biotin is the chemical name of Vitamin:
Answer: b) Biotin is the chemical name of Vitamin H
(xxviii) Which base is present in RNA but not in DNA?
Answer: a) Uracil
