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71. 1 mole of a hydrocarbon 'X' undergoes complete saturation with 1 mole of hydrogen in presence of a heated catalyst. What would be the formula of 'X? (NTSE West Bengal, Stage-I, 2014-15)
C2H6
C2H2
C5H10
C7H16
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72. Which of the following are isomers? (NTSE West Bengal, Stage-I, 2014-15)
Butane and Isobutene
Ethane and Ethene
Cyclopropane and Propene
Butane and Isobutane
73. Hard water does not easily produce lather with soap because it contains (NTSE Chandigarh, Stage-I, 2014-15)
Only Mg2+ ions
Only Ca2+ ions
Both Mg2+ and Ca2+ ions
Both Na+ and K+ ions
74. Which of the following represent saponification reaction? (NTSE Chandigarh, Stage-I, 2014-15)
2CH3COOH + 2Na → CH3COONa + H2
CH3COOC2H5 + NaOH → CH3COONa + C2H50H
75. Acetic acid may be prepared by the (NTSE Odisha, Stage-I, 2014-15)
Reduction of acetone
Oxidation of ethanol
Destructive distillation of soft coal
Polymerization of ethylene
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