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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.
विकल्प
True
False
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उत्तर
True
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संबंधित प्रश्न
State one use of the following metal:
Aluminium
State one use of the following metal:
Silver
The atomic number of an element X is 12.
- What must an atom of X do to attain the nearest inert gas electron configuration?
- Which inert gas is nearest to X?
Name one ore of manganese. Which compound of manganese is present in this ore? Also write its chemical formula.
Name a metal which is not malleable :
State two important uses of the following metal.
Uses of magnesium
Why is hydrogen placed with alkali metals?
Take an element from an alkali metal and one from an alkaline earth metal and write an equation for their action with:
Sulphuric 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 scientific reason.
Anodes need to be replaced from time to time during the electrolysis of alumina.
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 |
Give a reason why a green deposit is seen on the surface of an article 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.
A white crystalline solid which decrepitates on heating leaving a residue which fuses with the glass and evolves two gases one of which is coloured and acidic.
Match the columns.
| Group A | Group B |
| 1) Copper and Zinc | a) Brass |
| 2) Copper and Tin | b) Bronze |
| c) Stainless steel |
Write the name.
Two highly reactive metals-
Generally, metals are solid in nature. Which one of the following metals is found in a liquid state at room temperature?
Which one of the following metals do not react with cold as well as hot water?
Which one of the following four metals would be displaced from the solution of its salts by other three metals?
Name two soft metals which can be cut with a knife.
Which metal has the highest ductility?
