## Topic: Structure of Atom, Test No.: 05, Total MCQs: 10

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Question 1 |

**How does the Binding Energy per nucleon vary with the increase in the number of nucleons? [NEET 2013]**

Increases continuously with mass number | |

Decrease continuously with mass number | |

First decreases and then increases with increase in mass number | |

First increases and then decreases with increase in mass number |

Question 2 |

**An electron in hydrogen atom makes a transition n**

_{1}**→ n**

_{2}where n_{1}and n_{2}are principal quantum numbers of the two states. Assuming Bohr's model to be valid the time period of the electron in the initial state is eight times that in the final state. The possible values of n_{1}and n_{2}aren _{1} = 4 and n_{2} = 2 | |

n _{1} = 6 and n_{2} = 2 | |

n _{1} = 8 and n_{2} = 1 | |

n _{1} = 8 and n_{2} = 2 |

Question 3 |

**An electronic transition in hydrogen atom results in the formation of H**

_{a}line of hydrogen in Lyman series, the energies associated with the electron in each of the orbits involved in the transition (in kcal mol^{–1}) are–313.6, –34.84 | |

–313.6, –78.4 | |

–78.4, –34.84 | |

–78.4, –19.6 |

Question 4 |

**In Bohr series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inner-orbit jumps of the electron for Bohr orbits in an atom of hydrogen?**

3 → 2 | |

5 → 2 | |

4 → 1 | |

2 → 5 |

Question 5 |

**In the ground state, an element has 13 electrons in its M-shell. The element is_____.**

Copper | |

Chromium | |

Nickel | |

Iron |

Question 6 |

**Isoelectronic pair among the following is**

Ca and K | |

Ar and Ca ^{2+} | |

K and Ca ^{2+} | |

Ar and K |

Question 7 |

**Lithium forms body centred cubic structure. The length of the side of its unit cell is 351 pm. Atomic radius of the lithium will be :**

75 pm | |

300 pm | |

240 pm | |

152 pm |

Question 8 |

**An electron is moving in Bohr's fourth orbit. Its de-Broglie wavelength is λ. What is the circumference of the fourth orbit?**

2/λ | |

2λ | |

4λ | |

4/λ |

Question 9 |

**An element has 2 electrons in K shell, 8 electrons in L shell, 13 electrons in M shell and one electron in N shell. The element is**

Cr | |

Fe | |

V | |

Ti |

Question 10 |

**In a hydrogen atom, if energy of an electron in ground state is 13.6 eV, then that in the 2**

^{nd}excited state is1.51 eV | |

3.4 eV | |

6.04 eV | |

13.6 eV |

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