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11. 

The variety of coal in which the deposit contains recognisable traces of the original plant material is
A. bitumen
B. एन्थ्रेसाइट
C. लिग्नाइट
D. पीट
12. 

Bromine is a
A. black solid
B. लाल तरल
C. बेरंग गैस
D. अत्यधिक ज्वलनशील गैस
13. 

Which of the following is used as a lubricant?
A. Graphite
B. सिलिका
C. आयरन ऑक्साइड
D. हीरा
14. 

Tetraethyl lead is used as
A. pain killer
B.

अग्निशामक
C.

मच्छर मारक
D.

पेट्रोल अद्दितीवे 
15. 

The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is
A. Argon
B. क्सीनन
C. हीलियम
D. क्रीप्टोण