11. Write down the molecular formula of following compounds by criss-cross
method
a. Ammonia
b. Methane
c. Common salt
d. Limestone
e. Hydrochleric acid
f. Caustic soda​

Aseasonal prevailing wind in the region of south and southeast asia, blowing from the southwest between may and september and bringing rain (the wet monsoon ), or from the northeast between october and april (the dry monsoon ).

Ahigh energy (high speed) particle (alpha or beta or neutron) are shot at the target;