19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
For an ionic crystal of the general formula AX and coordination number 6, the value of radius ratio will be
In a crystalline solid, having formula XY2O4, oxide ions are arranged in cubic close packed lattice while, cations X are present in tetrahedral voids and cations Y are present in octahedral voids. The percentage of te…
The correct statement regarding F-centre is
In case of semiconductors, the gap between the valence band and conduction band is …A… Here, A refers to
If the radius of K+ and F– are 133 pm and 136 pm respectively, the distance between K+ and F– in KF is
…A… and …B… are the examples of intrinsic semiconductors. Here, A and B refer to
Solid SO2 and NH3 are the examples of which of the following types of solids? (CBSE 2018)
Which of the following is an example of network solid? (AIIMS 2018) (a) SO Solid (b) 2I
Lithium has a bcc structure. Its density is 520 kg m–3 and its atomic mass is 6.94 g mol–1. Calculate the edge length of a unit cell of Lithium metal. (NA = 6.02 × 1023 mol–1) (NEET 2016)
An atom forms face centred cubic crystal with density d = 8.92g/mL and edge length a 3.6 10 cm x . The molecular mass of atom in amu is (JIPMER 2018)
Niobium crystallises in body centred cubic structure. If density is 8.55 g cm-3, then the atomic radius of niobium is (atomic mass of niobium = 93u) (AllMS 2018)
The structure of MgO is similar to NaCl. What would be the coordination number of magnesium.
In NaCl lattice the radius ratio is Na Cl r r =
How many chloride ions are there around sodium ion in sodium chloride crystal.
If the coordination number of Ca2+ in CaF2 is 8, then the coordination number of F– ion would be
What is the coordination number of sodium in Na2O
In CsCl lattice the coordination number of Cl– ion is
For the structure of solid given below if the lattice points represent A+ ions & the B– ions occupy all the tetrahedral voids then coordination number of A is
For the structure given below the site marked as S is a
Which of the following statements is not true about the voids?
A solid A+B– has the B– ions arranged as below. If the A+ ions occupy half of the octahedral sites in the structure. The formula of solid is
The number of octahedral voids in a unit cell of a cubical closest packed structure is
The unit cell of a NaCl lattice
A metal crystallizes in a face-centered unit cell. Its edge length is 0.410 nm. The radius of the metal is
In ABC packing if the number of atoms in the unit cell is n then the number of tetrahedral voids in the unit cell is equal to