Question Detail

Mass number of a nucleus is :

the sum of the number of protons and neutrons present in the nucleus
always more than the atomic weight
always less than its atomic number
None of above

Answer: Option A

Similar Questions :

1. What is Calcium sulphate ?

epsom salt
blue vitriol
gypsum salt
potash alum

Answer: Option C

2. The oxide of Nitrogen used in medicine as anaesthetic is ?

Nitrogen pentoxide
Nitrous oxide
Nitric oxide
Nitrogen dioxide

Answer: Option A

3. Why is phosphorus kept under water ?

to make it wet
to make it durable
water forms a protective coating on it
to save it from catching fire when exposed to dry air

Answer: Option D

4. Which of the following elements behave chemically both as a metal and a non metal?

Boron
Carbon
Argon
Mercury

Answer: Option A

5. How many different oxides are formed by nitrogen ?

two
three
four
five

Answer: Option A

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