Advertisements
Advertisements
प्रश्न
Make pairs of substances and their properties
| Substance | Property |
| a. Potassium bromide (KBr) | 1. Combustible |
| b. Gold | 2. Soluble in water |
| c. Sulphur | 3. No chemical reaction |
| d. Neon | 4. High ductility. |
उत्तर
| Substance | Property |
| a. Potassium bromide (KBr) | 2. Soluble in water |
| b. Gold | 4. High ductility |
| c. Sulphur | 1. Combustible |
| d. Neon | 3. No chemical reaction |
संबंधित प्रश्न
Write any three differences between metals and non-metals with respect to their physical properties.
Why are metals used for making cooking vessels?
Which property of copper and aluminium makes them suitable for making electric wires?
Which metal foil is used for packing some of the medicine tablets?
Name two non-metals which are both brittle and non-ductile.
What are metals? Name five metals.
Define non-metals. Give five examples of non-metals.
Which of the following metal exists in the liquid state?
(a) Na
(b) Ag
(c) Cr
(d) Hg
What is an amalgam? How does an amalgam different from an alloy?
`Cl +e- → —`
Name:
two metallic oxides which are amphoteric
Name a non-metal which shows reducing property.
Write scientific reason.
The stainless steel vessels in Kitchen have copper coating on the bottom.
Three experiments to study the process of rusting are given below. Observe the three test tubes and answer the following questions.
- Why the nail in the test tube 2 is not rusted?
- Why is the nail in the test tube 1 is rusted highly?
- Would the nail in the test tube 3 get rusted?
Explain the following:
Metals like calcium and magnesium are never found in their free state in nature.
Give the common name and chemical name of an ore of:
(a) zinc (b) aluminium (c) iron.
Give reason for the following:
Rusting reduces the structural strength of iron.
State whether the statement given below is true or false. If false write the correct statement.
The chemical name of rust is iron [III] oxide.
Non-metals form covalent chlorides because ____________.
Which of the following non-metals is a liquid?
