46. Consider the molecules CH4,NH3 and H2O. Which of the given statements is false?
(1)The H – C – H bond angle in CH4, the H – N – H bond angle in NH3, and the H – O – H bond angle inH2O are all greater than 90°.
(2)The H – O – H bond angle in H2O is larger than the H – C – H bond angle in CH4.
(3)The H – O – H bond angle in H2O is smaller than the H – N – H bond angle in NH3.
(4)The H – C – H bond angle in CH4 is larger than the H – N – H bond angle in NH3.
47.
(1) X = 1 – Butyne ; Y = 3 – Hexyne
(2) X = 2 – Butyne ; Y = 3 – Hexyne
(3) X = 2 – Butyne ; Y = 2 – Hexyne
(4) X = 1 – Butyne ; Y = 2 – Hexyne
48. Among the following, the correct order of acidity is:
(1) HClO3 < HClO4 < HClO2 < HClO
(2) HClO < HClO2 < HClO3 < HClO4
(3) HClO2 < HClO < HClO3 < HClO4
(4) HClO4 < HClO2 < HClO < HClO3
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NEET-UG 2015 Chemistry Question Paper with Answer Key
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NEET-UG 2013 Chemistry Question Paper with Answer Key
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NEET-UG 2010 Chemistry Question Paper with Answer Key
49. The rate of a first-order reaction is 0.04 mol l−1s−1 at 10 second and 0.03 mol l−1s−1 at 20 seconds afterinitiation of the reaction. The half-life period of the reaction is:
(1)24.1 s (2)34.1 s
(3)44.1 s (4)54.1 s
50. Which one of the following characteristics is associated with adsorption?
(1)ΔG is negative but ΔH and ΔS are positive
(2)ΔG,ΔH and ΔS all are negative
(3)ΔG and ΔH are negative but ΔS is positive
(4)ΔG and ΔS are negative but ΔH is positive
51. In which of the following options the order of arrangement does not agree with the variation of propertyindicated against it?
(1)Al3+ < Mg2+ < Na+ < F− (increasing ionic size)
(2)B < C < N < O (increasing first ionization enthalpy)
(3)I < Br < Cl < F (increasing electron gain enthalpy)
(4)Li < Na < K < Rb (increasing metallic radius)
52. Which of the following statements is false?
(1)Mg2+ ions form a complex with ATP.
(2)Ca2+ ions are important in blood clotting.
(3)Ca2+ ions are not important in maintaining the regular beating of the heart.
(4)Mg2+ ions are important in the green parts of plants.
53. Which of the following statements about hydrogen is incorrect?
(1) Hydrogen has three isotopes of which tritium is the most common.
(2) Hydrogen never acts as cation in ionic salts.
(3) Hydronium ion, H3O+ exists freely in solution.
(4) Dihydrogen does not act as a reducing agent.
54. The correct statement regarding a carbonyl compound with a hydrogen atom on its alpha carbon, is:
(1) A carbonyl compound with a hydrogen atom on its alpha-carbon never equilibrates with its correspondingenol.
(2) A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its correspondingenol and this process is known as aldehyde-ketone equilibration.
(3) A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its correspondingenol and this process is known as carbonylation.
(4) A carbonyl compound with a hydrogen atom on its alpha-carbon rapidly equilibrates with its correspondingenol and this process is known as keto-enol tautomerism.
55. MY and NY3, two nearly insoluble salts, have the same Ksp values of 6.2×10−13 at room temperature. Whichstatement would be true in regard to MY and NY3?
(1) The molar solubilities of MY and NY3 in water are identical.
(2) The molar solubility of MY in water is less than that of NY3.
(3) The salts MY and NY3 are more soluble in 0.5 M KY than in pure water.
(4) The addition of the salt of KY to solution of MY and NY3 will have no effect on their solubilities.
57. Nutural rubber has:
(1) All cis – configuration
(2) All trans – configuration
(3) Alternate cis – and trans – configuration
(4) Random cis – and trans – configuration
58.
(1) (a) – (iv) (b)- (ii) (c) – (iii) (d) – (i)
(2) (a) – (ii) (b)- (iii) (c) – (i) (d) – (v)
(3) (a) – (i) (b)- (ii) (c) – (iii) (d) – (iv)
(4) (a) – (iii) (b)- (iv) (c) – (v) (d) – (i)