Science (English Medium) कक्षा १२ - CBSE Question Bank Solutions for Chemistry

The unit cell of a substance has cations A⁺ at the corners of the unit cell and the anions B⁻ at the center. The simplest formula of the substance is ____________.

Total number of voids in 0.5 mole of a compound which forms hexagonal close packed structure is ____________.

A compound is formed by two elements A and B. The element B forms cubic close packing and atoms of A occupy `1/3"rd"` of tetrahedral voids. The formula of this compound is ____________.

Raoult’s law states that for a solution of volatile liquids the partial pressure of each component in the solution is ____________.

Minimum boiling azeotrope is formed by the solution which showed

In a coordination entity of the type [PtCl₂(en)₂]²⁺ which isomer will show optical isomerism?

AgCN reacts with haloalkanes to form isocyanide. Haloalkanes react with KCN to form alkyl cyanides as the main product. Why?

In the reaction, \[\ce{R - X + NaOR' -> ROR’ + X}\] ( – ve ion). The main product formed is:

Which compound in the following pair reacts faster in S_N2 reaction with OH^–?

1. CH₃Br or CH₃
2. CH₃Cl, (CH₃)₃CCl

Arrange the following organic compounds in descending order of their reactivity towards S_N1 reaction.

C₆H₅CH₂Br, C₆H₅CH(C₆H₅)Br, C₆H₅CH(CH₃)Br, C₆H₅C(CH₃)(C₆H₅)Br

What is the coordination number of sodium in Na₂O?

The Ca²⁺ and F^– are located in CaF₂ crystal, respectively at face centered cubic lattice points and in ____________.

If AgI crystallises in zinc blende structure with I^– ions at lattice points. What fraction of tetrahedral voids is occupied by Ag⁺ ions?

Which set of following characteristics for ZnS crystal is correct?

Percentages of free space in cubic close packed structure and in the body-centered packed structure are respectively:

In which of the following crystals alternate tetrahedral voids are occupied?

The number of octahedral voids present in a lattice is A. The number of closed packed articles, the number of tetrahedral voids generated is B the number of closed packed particles:

In the hexagonal close-packed structure of a metallic lattice, the number of nearest neighbours of a metallic atom is ____________.

If Germanium crystallises in the same way as diamond, then which of the following statement is not correct?

In the cubic close packing, the unit cell has ______.