1
AP EAPCET 2021 - 20th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

The first ionisation enthalpies of $$\mathrm{Mg}$$ and $$\mathrm{Al}$$ can be expected to be ............ .

A
$$\mathrm{IE}_1(\mathrm{Mg})=577.5 \mathrm{~kJ} \mathrm{~mol}^{-1}, \mathrm{IE}_1(\mathrm{Al})=577.5 \mathrm{~kJ} \mathrm{~mol}^{-1}$$
B
$$\mathrm{IE}_1(\mathrm{Mg})=577.5 \mathrm{~kJ} \mathrm{~mol}^{-1}, \mathrm{IE}_1(\mathrm{Al})=737.5 \mathrm{~kJ} \mathrm{~mol}^{-1}$$
C
$$\mathrm{IE}_1(\mathrm{Mg})=737.7 \mathrm{~kJ} \mathrm{~mol}^{-1}, \mathrm{IE}_1(\mathrm{Al})=737.7 \mathrm{~kJ} \mathrm{~mol}^{-1}$$
D
$$\mathrm{IE}_1(\mathrm{Mg})=737.7 \mathrm{~kJ} \mathrm{~mol}^{-1}, \mathrm{IE}_1(\mathrm{Al})=577.5 \mathrm{~kJ} \mathrm{~mol}^{-1}$$
2
AP EAPCET 2021 - 20th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

Which of the following statements is/are correct?

1. Mercury is the only metal that exists as liquid at room temperature.

2. Among non-metals, carbon has the highest melting point.

3. Hydrogen is the most abundant element in the universe.

4. Oxygen is the most abundant element in the Earth's crust.

A
1
B
2
C
3
D
1, 2, 3, 4
3
AP EAPCET 2021 - 20th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

A covalent molecule '$$X Y^{\prime}$$' is found to have a dipole moment of $$1.5 \times 10^{-29} \mathrm{C} \cdot \mathrm{m}$$ and $$a$$ bond length of $$150 ~\mathrm{pm}$$. The percent ionic character of the bond will be

A
$$50 \%$$
B
$$62.5 \%$$
C
$$75 \%$$
D
$$80 \%$$
4
AP EAPCET 2021 - 20th August Evening Shift
MCQ (Single Correct Answer)
+1
-0

The hybridisation of $$\mathrm{Se}$$ in $$\mathrm{SeF}_4$$ and its geometry respectively are :

A
$$s p^3 d$$, see-saw shaped
B
$$s p^3 d^2$$, octahedral
C
$$s p^3 d^3$$, trigonal planar
D
$$s p^3 d^2$$, square planar