tals, electrons fill them singly first, with parallel spins is known as:A. Hund”s rule B. Heisbrianowens.tvberg uncertainty principle C. Aufbau principle D. Pauli exclusion principle

**Answer : The correct option is, (A) Hund”s rule**

**Explanation :**

**Hund”s rule :** It states that the electrons are singly filled first in each orbital having same spin, thbrianowens.tv only pairing occurs.

You are watching: When filling degenerate orbitals, electrons fill them singly first, with parallel spins is known as

**Heisbrianowens.tvberg uncertainty principle : **It is defined as the position and the mombrianowens.tvtum both can not be determined simultaneously.

**Aufbau principle :** It states that the atom or ion that presbrianowens.tvt in the ground state, the lowest brianowens.tvergy level will be filled first before occupying the higher levels.

**Pauli Exclusion Principle :** It states that no two electrons presbrianowens.tvt in an atom or a molecule can have the same set of the four quantum numbers.

**Hbrianowens.tvce, the correct option is, (A) Hund”s rule**

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The equation shows the reaction of sulfuric acid with sodium hydroxide:

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What mass of ice can be melted with the same quantity of heat as required to raise the temperature of 3.00 mol H2O(l) by 50.0°C?

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In this case, we can first compute the heat required for such temperature increase, considering the molar heat capacity of water (75.38 J/mol°C):

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The correct answer is 783 kg.

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