What does below rebus means ?

When it's bad luck to meet a black cat?

What kind of band never plays music?

What has one letter and starts with an E?

I have teeth but i don't bite. Who Am I ?

If you drop a 15 kg iron bar and a 5 kg bag of cotton from a height of 50 meters which will reach the ground first?

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

A word I know,
Six letters contain,
Subtract just one,
And twelve is what remains.

Chef Andrea has to light the kitchen stoves to open her restaurant for the day. There are three stoves in the kitchen: A glass stove, a brick stove, and a wood stove. She only has one match. Which does she light up first?

Seven Robbers robbed a bank and hide the coins in a lonely place.
They decide to divide the money equally the next morning. Two greedy robbers decided to cheat the others and reach the place at night. They equally divided the coins between them, one coin left. So they called another robber and then they decided to divide equally among the three. Sadly again one coin left. The same thing happened to the 4th 5th and the 6th robber.
However, when the 7th robber reached in the morning, they can divide the coins equally.

How many coins were there in total?