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प्रश्न
Fill in the blank
A chemical compound that makes up the striking heads of match sticks is ______
उत्तर
A chemical compound that makes up the striking heads of match sticks is sulphur.
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संबंधित प्रश्न
Fill in the blanks:
Phosphorus is a very _________ non-metal.
Choose the most appropriate answer of the following:
This is not an alloy of copper:
(A) Brass
(B) Bronze
(C) Solder
(D) Duralumin.
Name one metal and one non-metal which exist in liquid state at room temperature.
Name a metal as precious as gold
Name a metal used as a thermometric liquid
Name a non-metal that is hardest naturally occurring substance
Name a non-metal that is liquid at room temperature
Fill in the blank.
A non-metal used to purify water is ______.
Name a metal which can be cut with a knife :
Name a gaseous non-metal,. having greenish yellow colour.
`N+—→ N^3-`
Name:
two metals which are soft
Name:
two metallic oxides which are acidic
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. |
From the list of characteristics given below, select the five which are relevant to non-metals and their compounds:
- Ductile
- Conduct electricity
- Brittle
- Acidic Oxides
- Basic Oxides
- Discharged at anode
- Discharged at cathode
- Ionic chlorides
- Covalent chlorides
- Reaction with dilute sulphuric acid yields hydrogen
- 1, 2 or 3 valence electrons
- 5, 6, 7 valence electrons
(Write the five letters corresponding to the correct characteristics).
Which metal occurs as a carbonate also gives the name of their respective ore.
_______ is basic oxide.
_______ is good conductor of heat but bad conductor of electricity.
Non-metals are usually good conductors of heat and electricity.
The non – metal which is liquid at room temperature is ______.
