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प्रश्न
Tick (√) the most appropriate answer.
Sodium amalgam is prepared by dissolving sodium in :
विकल्प
molten copper
dilute vinegar
mercury
molten silver
उत्तर
mercury
APPEARS IN
संबंधित प्रश्न
Give an example of a metal which is a poor conductor of heat.
Fill in the blanks:
Iron is ________ reactive than copper.
Give the name and formulae of two acidic oxides.
Which property of copper and aluminium makes them suitable for making electric wires?
Name a non-metal having lustre (shining surface).
Name a non-metal that is lustrous
Name a non-metal that is used for filling into electric bulbs
Name the metals present in the following alloys
Bronze
Name the metals present in the following alloys
Stainless steel
Fill in the blank
A chemical compound that makes up the striking heads of match sticks is .........................
Write ‘true’ or ‘false’ for the following statement
Sodium can be cut with a knife.
Tick (√) the most appropriate answer.
Copper metal is used in :
Distinguish between metals and non metals on the basis of:
(i) ion formation, (ii) discharge of ions, (iii) nature of oxide formed, (iv) oxidizing and reducing property, (v) reaction with acids.
Give the balanced reactions for the following:
Red hot iron reacts with steam
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. |
Write scientific reason.
Sodium metal is kept in kerosene.
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).
Fill in the Blank and Rewrite the Statements:
Elements showing properties of both metals and nonmetals are known as _________.
Complete the statement given below, by filling in the blank with the correct word:
A metal which floats on water _____
Boojho has learnt that non-metals on beating with a hammer are generally broken into pieces. Which of the following is non-metal?
