Chemistry
Grade-10
Easy
Question
Aqua regia is a freshly prepared mixture of concentrated hydrochloric acid and concentrated nitric acid in the ratio of __________.
- 1 : 3
- 3 : 1
- 4 : 1
- 1 : 4
Hint:
3:1 ratio of concentrated hydrochloric acid and nitric acid is used to make aqua regia.
The correct answer is: 3 : 1
Aqua regia is a mixture of concentrated hydrochloric acid and concentrated nitric acid in the ratio 3:1. This mixture dissolves noble metals like gold and Platinum. It is made by combining one part concentrated nitric acid to three parts concentrated hydrochloric acid. It must be made fresh because it will decompose quickly.
Related Questions to study
Chemistry
During a reaction of metal with acids, which acid does not liberate hydrogen?
During a reaction of metal with acids, which acid does not liberate hydrogen?
ChemistryGrade-10
Chemistry
Which of the reaction is not possible?
Which of the reaction is not possible?
ChemistryGrade-10
Chemistry
Which metal from the following does not corrode easily?
Which metal from the following does not corrode easily?
ChemistryGrade-10
Chemistry
Assertion: Different metals have different reactivities with water and dilute acids.
Reason: The reactivity of a metal depends on the reactivity series.
Assertion: Different metals have different reactivities with water and dilute acids.
Reason: The reactivity of a metal depends on the reactivity series.
ChemistryGrade-10
Chemistry
The metal that starts floating over the surface of the water on reaction with water is -
The metal that starts floating over the surface of the water on reaction with water is -
ChemistryGrade-10
Chemistry
________ is the process of forming a thick layer of oxide of aluminium.
________ is the process of forming a thick layer of oxide of aluminium.
ChemistryGrade-10
Chemistry
The colour of the oxide formed when copper reacts with the oxygen is-
The colour of the oxide formed when copper reacts with the oxygen is-
ChemistryGrade-10
Chemistry
The acids present in the royal water is:
The acids present in the royal water is:
ChemistryGrade-10
Chemistry
Match the following according to the correct order of reactivity.
| a) Potassium | i) 4 |
| b) Calcium | ii) 2 |
| c) Zinc | iii) 3 |
| d) Lead | iv) 1 |
Match the following according to the correct order of reactivity.
| a) Potassium | i) 4 |
| b) Calcium | ii) 2 |
| c) Zinc | iii) 3 |
| d) Lead | iv) 1 |
ChemistryGrade-10
Chemistry
Which of the following metal reacts with steam to produce oxide in place of hydroxide?
Which of the following metal reacts with steam to produce oxide in place of hydroxide?
ChemistryGrade-10
Chemistry
Assertion (A): Anodising is a process to prevent metal from corrosion.
Reason (R): Anodising is a process of coating iron with a layer of zinc.
Assertion (A): Anodising is a process to prevent metal from corrosion.
Reason (R): Anodising is a process of coating iron with a layer of zinc.
ChemistryGrade-10
Chemistry
Assertion: Al2O3, is an amphoteric oxide.
Reason: Al2O3 form salt and water when reacts with acid as well as a base.
Assertion: Al2O3, is an amphoteric oxide.
Reason: Al2O3 form salt and water when reacts with acid as well as a base.
ChemistryGrade-10
Chemistry
Choose the correct option for why sodium is kept immersed in kerosene oil?
Choose the correct option for why sodium is kept immersed in kerosene oil?
ChemistryGrade-10
Chemistry
What is the change observed when an aluminum strip is kept immersed in freshly prepared ferrous sulphate solution taken in a test tube. Choose one of the following
What is the change observed when an aluminum strip is kept immersed in freshly prepared ferrous sulphate solution taken in a test tube. Choose one of the following
ChemistryGrade-10
Chemistry
Choose one of the following which shows the correct arrangement of the given metals in ascending order of their reactivity.
Choose one of the following which shows the correct arrangement of the given metals in ascending order of their reactivity.
ChemistryGrade-10
