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प्रश्न
A metal with melting point less than 50°C is
विकल्प
Gallium
Iron
Gold
Aluminium
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उत्तर
Gallium
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संबंधित प्रश्न
Which property of graphite is utilised in making electrodes?
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?
Mention two uses of the following metals and non-metals
Gold
Mention two uses of the following metals and non-metals
Oxygen
Give two uses of Germanium
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.
State the position of the following in the periodic table:
Alkaline earth metals
Write name.
The device used for grinding an ore.
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?
Pots and pans
With reference to the following metals state their use in daily life metal:
Zinc
With reference to the following metals state their use in daily life metal:
Lead
Write scientific reason.
Meena’s mother uses lemon or tamarind for cleaning copper vessels turned greenish.
Higher Order Thinking Skills.
Aakash noticed that the metal latch on gate was difficult to open during hot sunny days. However, it was not difficult to open the same latch at night. Aakash observed that the latch and the gate are exposed to the sun during day time.
- Formulate a hypothesis based on the information provided.
- Briefly state how you would test the hypothesis.
Which of the following two combinations are correct?
| Metal | Gas Evolved | |
| (i) | Copper | Yes |
| (ii) | Iron | Yes |
| (iii) | Magnesium | No |
| (iv) | Zinc | Yes |
An element forms an oxide A2O3 which is acidic in nature. Identify A as a metal or non-metal.
The typical shine of metals is called ______.
Metals are ______ conductors of heat and electricity.
Match the following
| i. | Softest metal | a. | Copper |
| ii. | Hardest metal | b. | Sodium |
| iii. | Hardest non–metal | c. | Osmium |
| iv. | Ductility | d. | Diamond |
X [2, 8, 7] and Y [2, 8, 2] are two elements. Using this information, complete the following:
______ is the reducing agent.
