19,000+ solved questions for JEE Advanced, JEE Mains, NEET & IChO — with answers and expert explanations.
The ratio of close-packed atoms to tetrahedral holes in cubic close packing is
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
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
The number of octahedral voids in a unit cell of a cubical closest packed structure is
In CsCl lattice the coordination number of Cl– ion is
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
Number of unit cells in 4 g of X (atomic mass = 40) which crystallises in bcc pattern is (NA = Avogadro's number) (OJEE 2010) (a) A 0.1N (c) A 2 0.1N x (b) A 0.1N (d) A N x
AB crystallises in a body-centred cubic lattice with edge 'a' equal to 387 pm. The distance between two oppositely charged ions in the lattice is (CBSE AIPMT 2010)
Electrons in a paramagnetic compound are
Those substances which show permanent magnetism even in the absence of magnetic field are called
On the basis of their magnetic properties, substances can be classified into …A… categories. Here, A refers to
Which of the following has the highest value of energy gap?
Identify the incorrect statement.
Percentage of free space in cubic close packed structure and in body centred packed structure are respectively
Which of the following defects are also called thermodynamic defects?
The density of KBr is 2.75 g cm –3. The length of the unit cell is 654 pm. Atomic mass of K = 39, Br = 80. Then the solid is
A metallic element has a cubic lattice. Each edge of the unit cell is 2 Å. The density of the metal is 2.5 g cm–3 . The unit cells in 200 g of the metal are
A compound contains two types of atoms X and Y. It crystallises in a cubic lattice with atoms X at the corners of the unit cell and atoms Y at the body centre. The simplest possible formula of this compound is
A metal crystallises in a face centred cubic structure. If the edge length of its unit cell is ‘a’, the closest approach between two atoms in metallic crystal will be :
Ag crystallises as fcc. If radius of Ag is 144 pm then its density will be (a)10 g cm–3
Doping of silicon (Si) with boron (B) leads to
Which one of the following is a covalent crystal? [KCET 2011]