1
BITSAT 2023
MCQ (Single Correct Answer)
+3
-1

Which of the following oxides is amphoteric in character?

A
$$\mathrm{SnO}_2$$
B
$$\mathrm{SiO}_2$$
C
$$\mathrm{CO}_2$$
D
$$\mathrm{CaO}$$
2
BITSAT 2023
MCQ (Single Correct Answer)
+3
-1

The temperature of $$K$$ at which $$\Delta G=0$$, for a given reaction with $$\Delta H=-20.5 \mathrm{~kJ} \mathrm{~mol}^{-1}$$ and $$\Delta S=-50.0 \mathrm{~JK}^{-1} \mathrm{~mol}^{-1}$$ is

A
$$-410$$
B
410
C
2.44
D
$$-2.44$$
3
BITSAT 2023
MCQ (Single Correct Answer)
+3
-1

A mixture of two moles of carbon monoxide and one mole of oxygen, in a closed vessel is ignited to convert the carbon monoxide to carbon dioxide. If $$\Delta H$$ is the enthalpy change and $$\Delta E$$ is the change in internal energy, then

A
$$\Delta H>\Delta U$$
B
$$\Delta H<\Delta U$$
C
$$\Delta H=\Delta U$$
D
the relationship depends on the capacity of the vessel
4
BITSAT 2023
MCQ (Single Correct Answer)
+3
-1

Which of the following statements does not form a part of Bohr's model of hydrogen atom?

A
The position and velocity of the electrons in the orbit cannot be determined simultaneously.
B
The electron in the orbit nearest the nucleus has the lowest energy.
C
Electrons revolve in different orbits around the nucleus.
D
Energy of the electrons in the orbit is quantised.
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