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2856
Why does the treatment of cotton fabrics with dilute acids weaken the materials?
  • A. Cotton is hydrolysed completely to glucose
  • B. The fabrics are soluble in dilute acids
  • C. The molecular chains are partially broken
  • D. The molecular chain length f the fabric increases
  • E. The thread holding the fabric together Is completely destroyed.
View Answer & Discuss NECO 2003
2857

Naturally occurring lithium consists of 90% \( ^7_3Li \text{ and 10% } ^6_3 Li. \) What is the relative atomic mass of lithium?

  • A. 6
  • B. 6.8
  • C. 6.9
  • D. 7
  • E. 7.1
View Answer & Discuss (3) NECO 2003
2858
What mass of silver is deposited when a current of 2.6 A is passed through a solution of a silver salt for 40 minutes? [Ag= 108 ; F=96500C]
  • A. 6.89g
  • B. 6.93g
  • C. 6.98g
  • D. 7.04g
  • E. 7.12g
View Answer & Discuss (1) NECO 2003
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2859

An atom of element X has an electronic configuration of \( 1s^22S^22p^63s^23p^3. \) In which group of the periodic table is X?

  • A. \( \text{0} \)
  • B. 2
  • C. 3
  • D. 4
  • E. 5
View Answer & Discuss (21) NECO 2003
2860
Which metal is a constituent of both bronze and solder?
  • A. copper
  • B. lead
  • C. silver
  • D. tin
  • E. zinc
View Answer & Discuss (2) NECO 2003
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