English Medium कक्षा १० - CBSE Question Bank Solutions

The solution of one of the following compounds will not conduct electricity. This compound is:

Buckminsterfullerene is an allotropic form of the element:

Out of KCl, HCl, CCl₄ and NaCl, the compounds which are not ionic are:

The number of covalent bonds in pentane (molecular formula C₅H₁₂) is ______.

One of the following compounds is not ionic in nature. This compound is:

A covalent molecule having a double bond between its atoms is ______.

The molecules having triple bond in them are ______.

One of the following contains a double bond as well as single bonds. This is:

Which of the following has a triple bond as well as single bonds?

The organic compound prepared by Wohler from an inorganic compound called ammonium cyanate was ______.

One of the following is not an allotrope of carbon. This is:

Two non-metals combine with each other by the sharing of electrons to form a compound X.

1. What type of chemical bond is present in X?
2. State whether X will have a high melting point or low melting point.
3. Will it be a good conductor of electricity or not?
4. Will it dissolve in an organic solvent or not?

A saturated hydrocarbon has fifty hydrogen atoms in its moleucle. The number of carbon atoms in its molecule will be ______.

A hydrocarbon having one double bond has 100 carbon atoms in its molecule. The number of hydrogen atoms in its molecule will be ______.

The electronic configurations of three elements X, Y and Z are as follows:

1. Which two elements will combine to form an ionic compound?
2. Which two elements will react to form a covalent compound?

Give reasons for your choice.

Which of the following cannot exhibit isomerism?

The pencil leads are made of mainly ______.

The number of isomers formed by the hydrocarbon with molecular formula C₅H₁₂ is ______.

An element A has 4 valence electrons in its atom whereas element B has only one valence electron in its atom. The compound formed by A and B does not conduct electricity. What is the nature of chemical bond in the compound formed? Give its electron-dot structure.

The number of carbon atoms joined in a spherical molecule of buckminsterfullerene is ______.