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(i) ∵ 1 × 1 = 1
 ∴ The unit’s digit of (81 )2 will be 1.
(ii) ∵ 2 × 2 = 4
 ∴ The unit’s digits of (272)2 will be 4.
(iii) Since, 9 × 9 = 81
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Cu2+ is more stable than Cu+.Stability depends on the hydration energy (enthalpy) of the ions when they bond to the water molecules. The Cu2+ ion has
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Speed test: In a speed test, there is a time limit within which the test taker is required to answer all the items. Such a test evaluates the individual on the
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Alkyl halides undergoes β - elimination in presence of alcoholic KOH, to give unsaturated hydrocarbons. This is also called dehydrodehalogenation of a
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The sign conventions are as follows: i) When heat is supplied to a system, dQ is positive. When heat is drawn from the system, dQ is negative. ii) When the ga
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The remedial lens should make the objects at infinity appear at the far point. Therefore, For object at infinity, u = – ∞ Far point distan
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Let present age of son = x yearsTwo years ago, Age of son = (x – 2) yearsAge of man = 3(x – 2)2∴ Man’s present age = 3(x – 2)2 + 2= 3(x2 – 4x +
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Hence, the nature of the cubic unit cell is ccp.
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