NDA CHEMISTRY QUIZ - 32

In the process of Goldschmidt’s Alumino-thermite reduction method , which of the following  acts as a reducing agent?

Of the three metals X , Y and Z , X reacts with cold water , Y with hot water and Z with steam. Identify X , Y and Z?

A strip of copper is placed in a beaker containing zinc sulphate solution. What would be observed?

To a test tube A , that contains Fe⁺³ ions , sodium hydroxide solution was added. What would be observed?

Atom of an element contains five electrons in its valence shell. This element is the major component of air .It exits as a diatomic molecule. Element is

A non-metal X belonging to group 15 in the periodic table has 3 allotropic forms . The two major allotropic forms are Y and Z. Identify X, Y, and Z?

Which of the following metal is the best conductor of electricity?

Stainless steel cooking pans often given a copper outer bottom because

A trivalent metal X is the most abundant metal in the earth's crust. Identify the metal?

There are two element A and B . A has two electrons in their valence shell and B has 7 electrons in their valence shell. Both element belongs to 3^rd period. State the type of bond present between two element A and B?