Question

anyone genius here ?????.....​

Answer 1

Answer:

15)

(i)  When solid lead nitrate is heated strongly a it turns yellow due to formation of lead oxide and a reddish brown gas is evolved which is nitrogen dioxide.

(ii) It's a decomposition reaction.

(iii) 2Pb(NO3)2 (s) + heat -------> 2PbO (s) + 4NO2 (g) + O2 (g)

16)

(i)     X   ---> NaHCO3(baking soda)

(ii)     ---> 2NaHCO3 + heat -------> Na2CO3 + CO2 + H2O

(iii)    Used in making baking powder.

17) they both belong to period 3.

Ionic bond cause they r not tetra-valent and they form ions.

MgS

18)

i) The first level is called producers and this consist of producers which are the green plants. Then comes the second level called the primary consumers like earthworms, which feeds on the green plants. Next is the secondary consumers like hens, birds which feeds on the earthworms. 4th level is the tertiary consumers including vultures, eagles, etc.

ii) More than 4 levels do not exist because there will be not any energy that will be left to transfer to higher levels.

I hope u find it useful. ^_^

I'm M4D_GENIUS  *_*

Answer 2

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