Question

11. Which of the following is a divalent radical?
(a) sodium
(b) phosphate
(c) oxalate
(d) borate
12. What is the molecular mass of K2Cr2O-?
[Atomic mass: K = 39, Cr = 52,0 = 16]
(a) 294
(b) 138
(c) 153
(d) 98
13. The percentage of oxygen in NaOH is
(a) 40
(b) 60
(c) 8
(d) 10
14. 60 g of a compound on analysis gives C = 24 g, H = 4 g
and O = 32 g. Its empirical formula is
(a) C2H2O2
(b) C2H20
(c) CH2O2
(d) CH20
15. A hydrocarbon contains 80% carbon. What is the
empirical formula of the compound?
(a) CH2
(b) CH3
(c) CH4
(d) CH
​

Answer 1

ANSWER

11) borate

12) 294g

13) 40%

14) Empirical formula= CH2O

And molecular formula= C2H4O2

15) CH3

This all answer is right

100% confidence

hope it help you

Answer 2

Answer:

how many times greater is the valency of n in NH3 than that of ci in hci