1
VITEEE 2023
MCQ (Single Correct Answer)
+1
-0

In context of the lanthanoides, which of the following statements is not correct?

A
14 elements in the sixth period (atomic number $$=58$$ to 71 ) that are filling $$4 f$$-sublevel.
B
common oxidation state is +3 .
C
Availability of $$4 f$$-electrons results in the formation of compounds in +4 state for all numbers of the series.
D
There is a gradual decrease in the of the elements with increasing atomic numbers in the series.
2
VITEEE 2023
MCQ (Single Correct Answer)
+1
-0

The number of peptide bonds in a linear tetrapeptide (made of different amino acids) are

A
one
B
two
C
three
D
four
3
VITEEE 2023
MCQ (Single Correct Answer)
+1
-0

The uncertainty in the momentum of an electron is $$2.0 \times 10^{-8} \mathrm{~kg} \mathrm{~ms}^{-1}$$. The uncertainty in its position will be

A
$$2.63 \times 10^{-27} \mathrm{~m}$$
B
$$2.63 \times 10^{-26} \mathrm{~m}$$
C
$$1.73 \times 10^{-27} \mathrm{~m}$$
D
$$2.57 \times 10^{-28} \mathrm{~m}$$
4
VITEEE 2023
MCQ (Single Correct Answer)
+1
-0

A metal has bcc structure and the edge length of its unit cell is $$8 \mathop A\limits^o$$. The volume of the unit cell ( in $$\mathrm{cm}^3$$) will be

A
$$5.12 \times 10^{-22}$$
B
$$5.42 \times 10^{-22}$$
C
$$4.32 \times 10^{-23}$$
D
$$3.89 \times 10^{-24}$$
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