عبوری عناصر

Written by Dr. Ayesha Nadeem (Chemistry)

بارہویں جماعت · کیمیا · 8 سوالات

نام: ____________________   تاریخ: ____________

1. Transition metals often form:

   • A Only gases
   • B Only colourless compounds
   • C Only acids
   • D Coloured compounds

2. The common oxidation states of iron are:

   • A +1 and +4
   • B 0 only
   • C +2 and +3
   • D -1 and -2

3. A substance that acts as a catalyst in the Haber process is:

   • A Platinum
   • B Copper
   • C Iron
   • D Nickel

4. Complex ions form because transition metals have:

   • A No electrons
   • B Low melting points
   • C Large charges only
   • D Empty d orbitals that accept electron pairs

5. Which of these is not a transition metal?

   • A Iron
   • B Sodium
   • C Chromium
   • D Copper

6. Transition metals show variable oxidation states because they use:

   • A Both ns and (n-1)d electrons
   • B Only the s electrons
   • C Only the p electrons
   • D Neutrons

7. The colour of copper sulphate crystals is:

   • A Green
   • B White
   • C Blue
   • D Pink

8. An alloy of copper and zinc is:

   • A Steel
   • B Solder
   • C Brass
   • D Bronze