Question

35) What happens when a piece or
copper metal is placed in iron
sulphate solution?
a) Green colour solution of iron sulphate
O changes to blue solution of copper
sulphate
O b) Grey precipitate of iron is formed
c) Deep blue colour solution of iron
O sulphate changes to green solution of
copper sulphate
o
c) Copper will not displace iron from
solution​

Answer 1

Answer:

B -part is correct answer

Answer 2

I'm assuming the question is meant to read:

10n≤n10

Python tells us:

>>> [n for n in range(1,100) if 10**n <= n**10]

[2, 3, 4, 5, 6, 7, 8, 9,10]

>>> len([n for n in range(1,100) if 10**n <= n**10])

9

But to actually think it out without Python-bashing:

1 doesn't grow from exponents, so 110 won't be bigger than 101 . We start at n=2 .

On the positive integers, both sides are strictly increasing, and we know the left side of the equation grows strictly faster than the right side, so once the left side is greater, it will remain greater.

At n=10 , we get 1010≤1010 .