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प्रश्न
Soft metal : Na : : hard metal : _______
उत्तर
Soft metal : Na : : hard metal : Tungsten
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संबंधित प्रश्न
The atomic number of an element Y is 16.
(a) What must an atom of Y do to achieve the nearest inert gas electron arrangement?
(b) Which inert gas is nearest to Y?
Explain how, a reduction reaction of aluminium can be used for welding cracked machine parts of iron. Write a chemical equation for the reaction involved.
Write ‘true’ or ‘false’ for the following statement :
Silver is used to make electric cables.
Statements given below are incorrect. Write the correct statements :
Bronze is a mixture of 10% copper, 80% zinc and 10% tin.
Statements given below are incorrect. Write the correct statements :
Aluminium is best conductor of electricity.
State two important uses of following metal:
Uses of gold
State two important uses of following metal:
Uses of silver
State two important uses of following metal
Uses of magnesium
Give the general characteristics of:
Alkali metals,
(i) bonding
(ii) action of air
(iii) action of water
(iv) action of acid
The electronic configuration of metal ‘A’ is 2,8,1 and that of metal ‘B’ is 2,8,2. Which of the two metals is more reactive? Write their reaction with dilute hydrochloric acid.
Which is the non-ionic compound in the compounds given below.
AgNO3 + Nacl → AgCl + NaNO3
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?
Ornaments
What is it made from? Why?
Pots and pans
Give a reason why iron objects rust easily but the iron pillar at Qutab Minar has not rusted over the years.
An element which is always lustrous, malleable and ductile is ______.
Assertion: Mercury is solid in room temperature.
Reason: Mercury is a non-metal.
Metals and non–metals are used for making ______, ______ and ______.
Why do metals appear shiny?
X [2, 8, 7] and Y [2, 8, 2] are two elements. Using this information, complete the following:
Metal atoms tend to have a maximum of ______ electrons in the outermost shell.
