Chemistry

Chemical Compounds and Reactions

505 Questions

Chemical compounds and reactions involve understanding the properties, colors, and formation of various chemical substances. Questions focus on identifying precipitates, observing color changes during reactions, and naming common compounds. This topic is a fundamental part of the chemistry syllabus for competitive exams.

identifying precipitateschemical reaction colorscompound namingcolloidal particle propertiesacid base reactions

Chemical Compounds and Reactions Questions

Multiple choice

Which of the following is a colourless solution that x contains?

To a colourless solution X, a few drops of dil. nitric acid, followed by a few drops of silver nitrate solution were added, and a white precipitate was formed. When a few drops of litmus solution were added to solution X, the solution turned red.

  1. Sulphuric acid

  2. Sodium hydroxide

  3. Hydrochloric acid

  4. Calcium hydroxide

  5. Ammonia
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

It is an acid, which turns litmus red and the chloride ion of hydrochloric acid gives white precipitate with silver nitrate solution.

Multiple choice

The colour of ____________ is not due to d-d transition.

  1. CrO42-

  2. [Ti(H2O)6]3+

  3. [CoCl4]2-

  4. [Cu(NH3)4]2+

  5. None of these
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This option is correct because the colour is observed due LMCT spectra. In CrO42-, electrons transfer by oxygen to the vacant orbital of Cr6+ ion. A little transition spectra is observed.

Multiple choice

The orange colour of Cr2O72- is due to __________.

  1. the metal to ligand charge transfer transition

  2. ligand to metal charge transfer transition

  3. crystal field transition

  4. charge transfer complexes formation

  5. none of these
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

This option is correct because in the ions of Cr2O72-, the Cr have six oxidation state, due to fact that all the electrons are removed from Cr atom. Therefore, the oxygen atoms are low lying MOs of Cr atom in this condition Cr2O72-.

Multiple choice

Asphalt is also known as

  1. bitumen

  2. paraffin oil

  3. vegetable oil

  4. pyrolysis oil

  5. algae fuels
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

This option is correct because asphalt is also known as bitumen. It is a sticky, black and highly viscous liquid.

Multiple choice

Which of the following substances is a mixture?

  1. Glucose

  2. Baking soda

  3. Tea

  4. Starch
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

A mixture is a material which contains two or more different kinds of particles (atoms or molecules), which are physically mixed in any proportion, but not chemically combined. Tea is a mixture containing water, sugar, salt, milk and tea leaves mixed in different proportions.