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51. Metallic copper can be used to retrieve silver from silver nitrate solution. This is because (NTSE Tamil Nadu, Stage-I, 2016-17)
Cu is less reactive than Ag
Cu is more reactive than Ag
Cu and Ag have same reactivity
Cu does not react with AgN03
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52. The compound containing both covalent and ionic bond is (NTSE Haryana, Stage-I, 2016-17)
MgCI2
NH4CI
CaO
AIBr3
53. Consider the following pairs of elements I and H C and F B and F N and F K and O The correct statement regarding these pairs is (NTSE Andhra Pradesh, Stage-I, 2016-17)
The two pairs Band F, K and O most likely to form ionic bonds
The least polar bond is formed between C and F
Between I and H an ionic bond is formed
Between Nand F the covalent bond is most polar
54. Which of the following compounds is bad conductor of electricity?(NTSE Madhya Pradesh, Stage-I, 2016-17)
Ionic compound
Electrovalent compound
Covalent compound
None of these
55. The German silver, an alloy, has the composition (NTSE Delhi, Stage-I, 2016-17)
Cu + Sn + Zn
Cu + Zn + Ni
Cu + Ag + Zn
Ag + Hg + Sn
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