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प्रश्न
Write ‘true’ or ‘false’ for the following statement.
Iodine acts as an antiseptic in the form of a tincture of iodine.
पर्याय
True
False
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उत्तर
True
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संबंधित प्रश्न
Fill in the blanks:
Metals react with acids to produce _________ gas.
Give reasons for the following.
Copper cannot displace zinc from its salt solution.
State one use of Gold.
Give the composition of an alloy called solder. State its one property and one use.
Fill in the following blank with suitable word:
Brass is an alloy of copper and .........
For the reduction of metal oxide, suggest a reducing agent other than carbon.
Statements given below are incorrect. Write the correct statements :
Bronze is a mixture of 10% copper, 80% zinc and 10% tin.
Name a metal which is best conductor of electricity :
State two important uses of following metal:
Uses of silver
Write name.
The reagent that dissolves noble metals.
Match the alloys given in column I to the uses given in column II :
| Column I | Column II |
| (i) Duralumin | A. Electrical fuse |
| (ii) Solder | B. Surgical instruments |
| (iii) Brass | C. Aircraft body |
| (iv) Stainless Steel | D. Decorative articles |
What is it made from? Why?
Electric cables
With reference to the following metals state their use in daily life metal:
copper
With reference to the following metals state their use in daily life metal:
Lead
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.
Which one of the following is an example for a metal?
Name one metal and one non-metal that exist in liquid state at room temperature. Also name two metals having melting point less than 310 K (37°C)
Which metals are not solid at room temperature?
Why are metalloids called semimetals?
