Subject :NSO Class : Class 8
Fill in the blanks with the most appropriate option.
‘W’ is very reactive metal, reacts vigorously with oxygen and water therefore, stored in (1).
‘X’ is non-metal, soft and dull and forms (2)oxides with oxygen.
‘Y’ is very reactive (3), catches fire if exposed to air, therefore, stored in water.
‘Z’ does not react with dilute hydrochloric acid even on heating but it reacts with sulphuric acid. When it is exposed to moist air for long, it acquires a dull (4)coating.
A 1-Water, 2-basic, 3-metal, 4-reddish brown
B 1-Kerosene, 2-acidic, 3-metal, 4-reddish brown
C 1-Kerosene, 2-acidic, 3-non-metal, 4-green
D 1-Water, 2-basic, 3-non-metal, 4-green
my answer is b can you explain me how it is c
Ans 1:
Class : Class 8
Hey Vartika. So here the metal they are talking about isnt potassium, but it is phosphorous. Potassium cannot be stored in water because it reacts with that too. So, here, the metal which they are talking about is phosphorous, which is a non-metal.Thanks! Hope that cleared your doubt :) ð
Ans 2:
Class : Class 9
I don't understand.. potassium is very reactive in air and is thus stored in water.. and potassium is a metal hence correct answer should be b.. how is it c?... if anyone reads this pls reply here.. thanks
Ans 3:
Class : Class 9