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Quiz 200
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3981. Which compound is formed when magnesium is reacted with 2 molecules of water?
Mg(OH)₂
MgOH
Mg:OH
Mg:(OH)₂
3982. Which pair of ions have five unpaired electrons?
Fe²⁺ and Mn²⁺
Fe³⁺ and Mn²⁺
Fe²⁺ and Mn³⁺
Fe³⁺ and Mn²⁺
3983. Electronegativity of Al is approximately equal to:
B
Be
Na
Mg
3984. Which of the following alkali metals forms only normal oxide with O₂?
K
Na
Li
Rb
3985. Third period element that initially reacts rapidly with oxygen to form a protective oxide coating that prevents further reactions is:
Al
Na
Mg
Si
3986. Cu²⁺ salt solution is blue in color due to transition of electrons from:
d to d orbital
p to p orbital
p to d orbital
s to p orbital
3987. Potassium ferrocyanide is which type of salt?
Complex
Mixed
Double
Normal
3988. In K₄[Fe(CN)₆], the number of ligands are:
6
1
7
10
3989. Complex compounds have:
Complex structure
Complex ion & can exist independently
Can't exist independently
Both a & b
3990. Element with highest boiling point is:
Mn
Sc
V
Zn
3991. Highest oxidation state among d-block elements belongs to:
Sc
Mn
Co
Po
3992. Transition metals form alloys due to:
Large size
Similar atomic sizes
Variable oxidation state
Color transition
3993. Which oxidation state gives evidence of d-orbital?
2
3
4
All give
3994. Oxidation number of central metal atom is written in which language?
Greek
Roman numerals
English alphabet
Numbers
3995. Which of the following is not a thermosetting polymer?
Synthetic varnish
Epoxy resins
PVC
Both a & b
3996. Trend of unpaired electrons of transition elements:
Increase till Mn then decrease till Zn
Decrease till Mn then increase till Zn
Increase till Cr then decrease till Zn
Decrease till V then increase till Zn
3997. Which of the following property increases down the group in alkali metals?
Ionization energy
Reactivity
Electron affinity
Electronegativity
3998. The solubility of alkaline earth metal compounds:
Decreases down the group
Increases down the group
Remains constant
First increases then decreases
3999. When a metal carbonate is heated at 100°C, which of the following compound will readily decompose?
BaCO₃
MgCO₃
BeCO₃
SrCO₂
4000. The compound with an atom, which has an unshared pair of electrons is called:
Nucleophile
Electrophile
Protophile
None of the above
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