MEDIUM
10th Tamil Nadu Board
IMPORTANT
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Ionic radius increases across the period from left to right.

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Important Questions on Periodic Classification of Elements

MEDIUM
10th Tamil Nadu Board
IMPORTANT
Science Standard 10>Chapter 8 - Periodic Classification of Elements>TEXTBOOK EVALUATION>Q 3
All ores are minerals, but all minerals cannot be called as ores.
EASY
10th Tamil Nadu Board
IMPORTANT
Science Standard 10>Chapter 8 - Periodic Classification of Elements>TEXTBOOK EVALUATION>Q 4
Al wires are used as electric cables due to their silvery-white colour.
EASY
10th Tamil Nadu Board
IMPORTANT
Science Standard 10>Chapter 8 - Periodic Classification of Elements>TEXTBOOK EVALUATION>Q 5
An alloy is a heterogeneous mixture of metals.
HARD
10th Tamil Nadu Board
IMPORTANT
Science Standard 10>Chapter 8 - Periodic Classification of Elements>TEXTBOOK EVALUATION>Q 1
A is a reddish-brown metal, which combines with O2 at <1370 K gives B, a black coloured compound. At a temperature >1370 K, A gives C which is red in colour. Find A, B and C with reaction.
HARD
10th Tamil Nadu Board
IMPORTANT
Science Standard 10>Chapter 8 - Periodic Classification of Elements>TEXTBOOK EVALUATION>Q 2
A is a silvery-white metal. A combines with O2 to form B at 800°C, the alloy of A is used in making the aircraft. Find A and B.
MEDIUM
10th Tamil Nadu Board
IMPORTANT
Science Standard 10>Chapter 8 - Periodic Classification of Elements>TEXTBOOK EVALUATION>Q 3
What is rust? Give the equation for formation of rust.
MEDIUM
10th Tamil Nadu Board
IMPORTANT
Science Standard 10>Chapter 8 - Periodic Classification of Elements>TEXTBOOK EVALUATION>Q 4
State two conditions necessary for rusting of iron.
HARD
10th Tamil Nadu Board
IMPORTANT
Science Standard 10>Chapter 8 - Periodic Classification of Elements>TEXTBOOK EVALUATION>Q 1
State the reason for the addition of caustic alkali to bauxite ore during purification of bauxite.