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2851

What is the IUPAC name of CH3CCI=C(CH3)2?

  • A. 2-chloro -3 methylbut -2yne
  • B. 2 -chloro -3 methylbut -2ene
  • C. 2 -chloro -3 methylbutene
  • D. 3- methyl -2-chlorobut -2-ene
  • E. 3- methyl -2. chlorobut -2 yne
View Answer & Discuss NECO 2003
2852
What change will occur to the equilibrium mixture
\( 2CrO^{2-}_4(aq) + 2H^+(aq) ⇔ Cr_2O^{2-}_7(aq) + H_2O(l) \) when excess sodium hydrogen solution is added?
  • A. A yellow precipitate of Cr(OH)3 is formed
  • B. An orange precipitate of Cr(OH)3 is formed
  • C. The colour changes from orange to yellow
  • D. The colour changes from yellow to orange
  • E. There is no visible reaction.
View Answer & Discuss (2) NECO 2003
2853
Which element is the most electronegative?
  • A. calcium
  • B. fluorine
  • C. iodine
  • D. oxygen
  • E. sodium
View Answer & Discuss NECO 2003
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2854
What mass of copper is deposited when 6.5g of granulated zinc reacts with excess copper(II) tetraoxosulphate(VI) solution?

The equation for the reaction is: Zn(s) + \( CuSO_4(aq)→ ZnSO_4(aq)+ Cu(s)\)[CU= 64; Zn=65]
  • A. 3.2 g
  • B. 3.25 g
  • C. 6.4 g
  • D. 6.5 g
  • E. 64.0 g
View Answer & Discuss (5) NECO 2003
2855
An organic compound gave the following results on analysis: C = 29.3% ; H = 5.7%; Br = 65%.
What is the empirical formula of the compound? [C = 12, H = 1, Br=80]
  • A. CH3Br
  • B. C2H5Br
  • C. C3H5Br
  • D. C3H7Br
  • E. C4H9Br
View Answer & Discuss (6) NECO 2003
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