Inorganic chemistry questions

10 EASY QUESTIONS IN INORGANIC CHEMISTRY

Inorganic chemistry



1. What is the oxidation state of Sulphur in H2SO4?

  1. +2
  2. +3
  3. +6
  4. +4      

Answer: +6 

Explanation: Oxidation states of  Hydrogen, Oxygen are +1, -2, Substitute in formula,

                     2(1)+x+4(-2) = 0

                                       x = +6

2. What is the gas evolved when Zinc reacts with HCl?

  1. Cl2
  2. H2
  3. O2
  4. HCl
Answer: H2

Explanation: Zn + dil. HCl  ---> ZnCl2 + H2 (evolves)



3. Which of the following is a Noble gas?

  1. Oxygen
  2. Nitrogen
  3. Chlorine
  4. Neon
Answer: Neon

Explanation: Group 8 elements are called Noble gases. Since Neon is a group 8 element it is a Noble gas

4. Formula of Bleaching Powder?

  1. CaOCl2
  2. NaHCO3
  3. NaOH
  4. Na2CO3
Answer: CaOCl2

Explanation: Chemical name for bleaching powder is Calcium Hypochlorite which is used as a disinfectant in drinking water, bleaching textiles and as an oxidizing agent

5.  What is the colour of the precipitate when Silver nitrate reacts with Sodium chloride?

  1. Silver
  2. White
  3. Black
  4. Colourless
Answer: White

Explanation: AgNO3 + NaCl ---> AgCl + NaNO3
                     AgCl formed which is a White precipitate

6. Which elements has highest Electronegativity?

  1. Chlorine
  2. Oxygen
  3. Fluorine
  4. Sodium
Answer: Fluorine

Explanation: Electronegativity is the tendency of an atom to attract a shared pair of electron towards itself in a chemical bond. According to this Fluorine has the most electronegativity. To achieve octet and due to its small size Fluorine can easily attract electrons to achieve stability.

7. What happens when Fe2+ changes to Fe3+?

  1. Oxidation
  2. Hydrolysis
  3. Reduction
  4. No change
Answer: Oxidation

Explanation: Oxidation is the loss of electrons from an atom. So Fe2+ loses one electron and oxidized to Fe3+

8. Formula for Quick lime is

  1. Na2CO3
  2. NaHCO3
  3. CaO
  4. CaCl2
Answer: CaO (Calcium Oxide)

Explanation: Quick lime also known as Calcium Oxide is a white alkaline powder used in the production of steel, paper, cement and in water treatments.

9. Which of the following is stored under kerosene and why?

  1. Potassium
  2. Calcium
  3. Zinc
  4. Cadmium
Answer: Potassium

Explanation: Alkali metals like Potassium, Sodium is stored under kerosene because it reacts violently with air/moisture.

10. What is the colour of Copper Sulphate crystals?

  1. Green
  2. Red
  3. Violet
  4. Blue
Answer: Blue

Explanation: During crystallization copper sulphate combines with water molecules to form hydrated CuSO4.5H20, which is blue in colour. 



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