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UHS Past Papers /
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Chap No 9 /
Quiz 3

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MDCAT - UHS Past Papers - Chemistry - Chap No 9 Quiz

Attempt 10 MCQs on MDCAT - UHS Past Papers - Chemistry - Chap No 9 | Quiz 3

21. The trends in melting points of element of third period are depicted in figure below. The sharp decreases observed from Si to P is due to :

Decrease in atomic radius from Si to P
Change in bonding and structure of two elements
Different oxidation number of two elements
Increase in Electron density from Si to P

22. Melting points of group II-A elements are higher than those of group-1-A because:

Atoms of II-A elements have smaller size
II-A elements are more reactive
Atoms of II-A elements provide two bonding electrons
I-A elements have smaller atomic radius

23. The following sketch shows the variation in a physical property of third period elements against their atomic number. What physical property is plotted in this sketch?

Ionization energy
Melting point
Ionic radius
Atomic radius

24. Down the group, acid-base behavior of metallic oxides of group 2 elements changes to:

More basic
No change
Less basic
More acidic

25. Electron affinity of the atom is the energy released when:

Covalent bond of molecule is broken
Electron is added to gaseous atom
Electron is removed from gaseous atom
Covalent bond is formed between the atoms

26. In period 2 and period 3, maximum melting point is shown by elements:

Nitrogen and phosphorus
Neon and argon
Lithium and sodium
Carbon and silicon

27. Which group of the periodic table contains non-metals, metalloids, and metals?

IB
VIIA
IVA
VIA

28. Which of the following sulfate compounds is insoluble in water?

BeSO₄
BaSO₄
MgSO₄
CaSO₄

29. Which of the following complexes shows tetrahedral geometry?

[Fe(CO)₅]
[Cu(CN)₄]⁻²
[Au(Cl)₄]⁻
[Pt(NH₃)₄]⁺²

30. In which pair does one have all unpaired d orbitals while the other has all paired d orbitals?

Cu and Zn
Cr and Fe
Cr and Zn
Mn and Co

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