Density & Packing Fraction Past Year (2019 onward - NTA Papers) MCQs The Solid State (OLD NCERT) Chemistry NEET Practice Questions, MCQs, Past Year Questions (PYQs), NCERT Questions, Question Bank, Class 11 and Class 12 Questions, and PDF solved with answers

A compound is formed by two elements A and B. The element B forms cubic close-packed structure and atoms of A occupy 1/3 of tetrahedral voids. If the formula of the compound is $A_x B_y $ then the value of x+y is in option
1. 2
2. 5
3. 4
4. 3

Subtopic: Density & Packing Fraction |

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How are edge length 'a' of the unit cell and radius 'r' of the sphere related to each other in ccp structure?
(Choose correct option for your answer)

1.	$a = 2r$	2.	$a = r /2\sqrt2$
3.	$a = 4r /\sqrt3$	4.	$a = 2\sqrt2r$

Subtopic: Density & Packing Fraction |

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Copper crystallises in fcc unit cell with a cell edge length of $3.608 \times 10^{-8}$ cm. The density of copper is $8.92 \ g ~cm^{-3}$. The atomic mass of copper is:

1. 65 u
2. 63.1 u
3. 31.55 u
4. 60 u

Subtopic: Density & Packing Fraction |

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An element has a body-centered cubic (BCC) structure with a cell edge of 288 pm. The atomic radius is:

1. $\frac{\sqrt{2}}{4} \times 288$ pm

2. $\frac{4}{\sqrt{3}} \times 288$ pm

3. $\frac{4}{\sqrt{2}} \times 288$ pm

4. $\frac{\sqrt{3}}{4} \times 288$ pm

Subtopic: Introduction & Crystal System | Density & Packing Fraction |

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The formula of nickel oxide with metal deficiency defect in its crystal is $N i_{0.98} O$ . The crystal contains ${Ni}^{2 +} and {Ni}^{3 +}$ ions. The fraction of nickel existing as $N i^{2 +}$ ions in the crystal is-

1. 0.96

2. 0.04

3. 0.50

4. 0.31

Subtopic: Density & Packing Fraction |

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1.	\(a = 2r\)	2.	\(a = r /2\sqrt2\)
3.	\(a = 4r /\sqrt3\)	4.	\(a = 2\sqrt2r\)

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