1
TS EAMCET 2022 (Online) 20th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

The approximate ratio of the speed of light in vacuum to that of an electron in the first Bohr orbit of hydrogen atom is

A

$100: 1$

B

$137: 1$

C

$157: 1$

D

$191: 1$

2
TS EAMCET 2022 (Online) 20th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

Which of the following species are isoelectronic species?

(A) $\mathrm{O}^{2-}$

(B) $\mathrm{F}^{-}$

(C) $\mathrm{Na}^{+}$

(D) $\mathrm{Mg}^{2+}$

A

A, B and C only

B

A, C and D only

C

C and D only

D

A, B, C and D

3
TS EAMCET 2022 (Online) 20th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

Arrange the following in increasing order of ionic radii

$$ \mathrm{O}^{2-}, \mathrm{Na}^{+}, \mathrm{F}^{-}, \mathrm{Mg}^{2+} $$

A

$\mathrm{Mg}^{2+}<\mathrm{Na}^{+}<\mathrm{F}^{-}<\mathrm{O}^{2-}$

B

$\mathrm{Mg}^{2+}<\mathrm{F}^{-}<\mathrm{Na}^{+}<\mathrm{O}^{2-}$

C

$\mathrm{O}^{2-}<\mathrm{F}^{-}<\mathrm{Na}^{+}<\mathrm{Mg}^{2+}$

D

$\mathrm{O}^{2-}<\mathrm{Mg}^{2+}<\mathrm{F}^{-}<\mathrm{Na}^{+}$

4
TS EAMCET 2022 (Online) 20th July Morning Shift
MCQ (Single Correct Answer)
+1
-0

The set of molecules among the following with zero dipole moment is $\mathrm{CCl}_4, \mathrm{BF}_3, \mathrm{CHCl}_3, \mathrm{CS}_2, \mathrm{NH}_3$,

1, 4-dichlorobenzene, $\mathrm{CO}_2$

A

$\mathrm{CO}_2, \mathrm{CS}_2, \mathrm{BF}_3, \mathrm{NH}_3, \mathrm{CHCl}_3$ only

B

$\mathrm{CCl}_4, \mathrm{BF}_3, \mathrm{CO}_2, \mathrm{CS}_2$, 1, 4-dichlorobenzene only

C

$\mathrm{CO}_2, \mathrm{CS}_2, 1,4$-dichlorobenzene only

D

$\mathrm{CO}_2, \mathrm{CS}_2$ only

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