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Which of the following statement (s) about the Modern Periodic Table are incorrect (i) The elements in the Modern Periodic Table are arranged based on their decreasing atomic number (ii) The elements in the Modern Periodic Table are arranged based on their increasing atomic masses (iii) Isotopes are placed in adjoining group (s) in the Periodic Table (iv) The elements in the Modern Periodic Table are arranged based on their increasing atomic number (a) (i) only (b) (i), (ii) and (iii) (c) (i), (ii) and (iv) (d) (iv) only

Answer: (b) (i), (ii) and (iii) Elements in the Modern Periodic Table are arranged based on their increasing atomic number... View Article

An organic compound A on heating with concentrated H2 SO4 forms a compound B which on addition of one mole of hydrogen in presence of Ni forms a compound C. One mole of compound C on combustion forms two moles of CO2 and 3 moles of H2O. Identify the compounds A, B and C and write the chemical equations of the reactions involved.

Answer: Compound A is Eahnol (CH3CH2OH) CH3CH2OH in the presence of concentrated H2SO4 to give CH2 =CH2 \(\begin{array}{l}CH_{3}CH_{2}OH \overset{conc. H_{2}SO_{4}}{\rightarrow}... View Article

A compound C (molecular formula, C2H4O2) reacts with Na – metal to form a compound R and evolves a gas which burns with a pop sound. Compound C on treatment with an alcohol A in presence of an acid forms a sweet-smelling compound S (molecular formula, C3H6O2). On addition of NaOH to C, it also gives R and water. S on treatment with NaOH solution gives back R and A. Identify C, R, A, S and write down the reactions involved.

Answer: Compound C is CH3COOH Compound R is CH3COONa Compound A is C2H5OH Compound S is CH3COOC2H5 (1) Compound C... View Article