191.

Moderate electrical conductivity is shown by

• silica

• graphite

• diamond

• carborundum

Hydrolysis of (CH₃)₂SiCl₂ and CH₃SiCl₃ leads to:

• linear chain and cross linked silicones respectively

• cross linked and linear chain silicones respectively

• linear chain silicones only

• cross linked silicones only

Oxidation number of nitrogen in which among the oxides of nitrogen is the lowest?

• Nitric oxide

• Nitrous oxide

• Nitrogen dioxide

• Nitrogen trioxide

The reaction of zinc with dilute and concentrated nitric acid, respectively, produces:

• NO₂ and NO

• NO and N₂O

• NO₂ and N₂O

• NO₂ and N₂O

Which one has the highest boiling point?

• He

• Ne

• Kr

• Kr

Assertion : Nitrogen and Oxygen are the main components in the atmosphere but these do not react to form oxides of nitrogen.

Reason : The reaction between nitrogen and oxygen requires high temperature.

• Both assertion and reason are correct, but the reason is not the correct explanation for the assertion

• Both the assertion and reason are incorrect but the reason is not the correct explanation for the assertion.

• The assertion is incorrect, but the reason is correct

• The assertion is incorrect, but the reason is correct

Among the following oxoacids, the correct decreasing order of acid strength is

• HOCl > HClO₂>HClO₃ > HClO₄

• HClO₄>HOCl> HClO₂>HClO₃

• HClO₄>HClO₃>HClO₂>HOCl

• HClO₄>HClO₃>HClO₂>HOCl

Which of the following is the wrong statement?

• ONCl and ONO^- are not isoelectronic

• O₃ molecule is linear

• Ozone is violet-black in solid state

• Ozone is violet-black in solid state

The molecule having smallest bond angle is

• NCl₃

• AsCl₃

• SbCl₃

• SbCl₃

Which of the following statement is wrong?

• The stability of hydrides increases from NH₃ to BiH₃ in group 15 of the periodic table.

• Nitrogen cannot form dπ-pπ bond.

• Single N - N bond is weaker than the single P - P bond.

• Single N - N bond is weaker than the single P - P bond.