Download App

Periodic Classification of Elements — Science STD 10 — Question

Tamilnadu BoardEnglish MediumSTD 10SciencePeriodic Classification of Elements4 Marks
Question
Explain Gravity separation method.
✓

Answer

 Gravity Separation (or) Hydraulic method:
1. Principle: The difference in the densities or specific gravities of the ore and the gangue is the main principle behind this method. Oxide ores are purified by this method,
e.g., Haematite $Fe _2 O _3$ the ore of iron.
2. Method: The ore is poured over a sloping, vibrating corrugated table with grooves and a jet of water is allowed to flow over it. The denser ore particles settle down in the grooves and lighter gangue particles are washed down by the water.

Need a full question paper?

Generate a complete, print-ready paper with questions like this in minutes — across 16+ boards, with answer keys.

Start Generating Free

Explore more

More "[4 Mark Questions]" from Periodic Classification of Elements→Periodic Classification of Elements — all question types→Science STD 10 question papers→Tamilnadu Board STD 10 question papers→Tamilnadu Board question paper generator→

Similar questions

Distinguish between the saturated and unsaturated solution at a temperature of 25°C using the data given below (Note: Solubility of NaCl is 36 g).
  1. 16 g NaCl in 100 g water
  2. 36 g NaCl in 100 g water
→
Explain Mie Scattering.
→
An object 2 cm tall is placed 10 cm in front of a convex lens of focal length 15 cm. Find the position, size and nature of the image formed.
→
Complete the following reactions.
(a) $PCl _3+ Cl _2 \rightarrow$ ?
(b) $SiO _2+? \rightarrow CaSiO _3$
(c) $2 HgO \stackrel{\Delta}{\longrightarrow}$ ? + $O _2$
(d) $CaCO _3 \stackrel{\Delta}{\longrightarrow} ?+ CO _2$
(e) $Ca ( OH )_2 \stackrel{ CO _2}{\longrightarrow} ?+ H _2 O$
→
State and define the units of radioactivity.
→
A concave lens has focal length of 15 cm. At what distance should the object from the lens be placed so that it forms an image 10 cm from the lens?
→
(a) Explain genetically modified organisms |GMOs|.
(b) With the help of a tabular column tabulate the genetically modified plants and animals, with the objectives, gene inserted and achievement.
→
State and explain principle of moments.
→
Explain the preparation of detergents with their ingredients.
→
Describe Raman Scattering.
→