Advertisements
Advertisements
प्रश्न
Write ‘true’ or ‘false’ for the following statement :
Silver is used to make electric cables.
विकल्प
True
False
उत्तर
False
APPEARS IN
संबंधित प्रश्न
Mark ‘T’ if the statement is true and ‘F’ if it is false.
Sodium is a very reactive metal. ( )
What happens when Iron nails are placed in copper sulphate solution?
Write word equations of the reactions involved.
Saloni took a piece of burning charcoal and collected the gas evolved in a test tube.
(a) How will she find the nature of the gas?
(b) Write down word equations of all the reactions taking place in this process.
What is an amalgam?
For the reduction of metal oxide, suggest a reducing agent other than carbon.
What is an alloy? Give two examples of alloys.
Fill in the blank spaces by choosing the correct words from the given list.
List: amalgam, chlorine, gallium, sodium chloride, silver chloride
Salt of silver, such as ________ is used for making photographic films.
Tick (√) the most appropriate answer.
Graphite is used :
State two important uses of following metal
Uses of copper
Give the general characteristics of:
Alkaline earth metals with reference to
(i) bonding
(ii) action of air
(iii) action of water
(iv) action of acid
Take an element from an alkali metal and one from an alkaline earth metal and write an equation for their action with:
Hydrochloric acid,
Take an element from an alkali metal and one from an alkaline earth metal and write an equation for their action with:
Water.
Write name.
The device used for grinding an ore.
What was Mendeleev's basis for the classification of elements?
Name the following:
The chemical compound responsible for the green deposit on the surface of articles of copper.
On heating which of the following substances i.e. copper carbonate, zinc carbonate, washing soda, copper sulphate, zinc nitrate, copper nitrate, lead nitrate, ammonium chloride and ammonium dichromate – relate to the reaction given below.
An amorphous substance which turns from pale green to black on strong heating evolving a colourless, acidic gas as the only gaseous product.
Generally, metals are solid in nature. Which one of the following metals is found in a liquid state at room temperature?
Give an example of a metal which
- is liquid at room temperature.
- is the best conductor of heat.
A doctor prescribed a tablet to a patient suffering from iron deficiency. The tablet does not look like iron. Explain.
Which metals are not solid at room temperature?
