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Quiz 65
Mdcat-past-papers - UHS Quiz
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Board: UHS |
1281. Which of the following is the electronic configuration of Cr?
[Ar]3d4 4s2
[Ar]3d5 4s1
[Ar]3d5 4s1
[Ar]3d4 4s1
1282. The electronic configurations of some elements are given below. Recognize the element that belongs to group IIIA:
1s2 2s2 2p1
1s2 2s2 2p3
1s2 2s2 2p2
1s2 2s2 2p4
1283. Which of the following is correct electronic configuration of iron(II) ion (atomic no. of Fe = 26)
[Ar] 4s0 3d6
[Ar] 4s2 3d6
[Ar] 4s2 3d4
[Ar] 4s0 3d5
1284. Which of the following electronic configuration is correct for 24Cr?
1s2 2s2 2p6 3s2 3p6 4s1 3d5
1s2 2s2 2p6 3s2 3p6 3d4
1s2 2s2 2p6 3s2 3p6 3d5
1s2 2s2 2p6 3s2 3p6 4s6
1285. When 6d orbital is filled, the entering electron goes into:
7f
7d
7p
7s
1286. Which element has ground state electronic configuration of 1s2 ,2s2 2p6 , 3s2 3p6?
Ar
Na
Cl
S
1287. Which of the following electronic configuration is correct for carbon?
1s2 2s2 2p3
1s2 2s2 2p4
1s2 2s2 2p2
1s2 2s2 2p1
1288. Which of the following is different in Na ( Z = 11), Mg+2 (Z = 12) and Al+3 (Z = 13)?
Number of shells
Number of electrons
Number of protons
Electronic configuration
1289. Which element has the ground state electronic configuration of 1s2, 2s2, 2p6, 3s2, 3p6?
Ar
Cl
Na
S
1290. What is the proton (atomic number) of an element that has four unpaired electrons in its ground state?
6
14
22
26
1291. The elements for which the valve of ionization energy is low, can:
Gain electrons readily
Gain electron difficult
Lose electron less readily
Lose electron readily
1292. The ability of an atom in a covalent bond to attract the bonding electrons is called:
Ionization energy
Ionic bond energy
Electronegativity
Electron affinity
1293. In 'H-F' bond electronegativity difference is '1.9'. What is type of this bond?
Polar covalent bond
Pi bond
Non-polar covalent
Coordinate covalent
1294. Among LiCl, BeCl₂, NaCl, CsCl, the compounds with the greatest and the least ionic character respectively are:
LiCl & CsCl
NaCl and LiCl
CsCl and NaCl
CsCl and BeCl₂
1295. Which statement describes the conversion of magnesium atoms to magnesium ions for ionic bond formation with chlorine?
The change is reduction, because there has been a gain of electrons
The change is oxidation, because there has been a loss of electrons
The change is reduction, because there has been a loss of electrons
The change is oxidation, because there has been a gain of electrons
1296. Why dimer of Aluminium chloride is formed:
Aluminium is electron rich
Aluminium is having lone pair of electron
Aluminium donates lone pair to form bridge
Aluminium forms coordinate bonds with chloride to complete its octet
1297. Which of the following has a coordinate bond?
NaCl
CaO
NH₃BF₃
H₂O
1298. According to valence shell electron pair repulsion theory, the repulsive forces between the electron pairs of central atom of molecule are in the order:
Lone pair–Lone pair > Lone pair–Bond pair > Bond pair–Bond pair
Lone pair–Bond pair > Lone pair–Lone pair > Bond pair–Bond pair
Bond pair–Bond pair > Lone pair–Lone pair > Lone pair–Bond pair
Lone pair–Bond pair > Bond pair–Bond pair > Lone pair–Lone pair
1299. Which of the following molecule has largest number of shared pair of electrons?
C₂H4
N₂
CO₂
NH₃
1300. AB₄ type with no lone pairs geometry enables to form which shape of molecule?
Trigonal
Regular tetrahedron
Regular octahedron
Regular pyramidal
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