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FORMULA :- Metal carbonate/metal hydrogen carbonate+ acid ----------> salt + carbondioxide + hydrogen. SODIUM HYDROGEN CARBONATE WITH ACID:- NaHCO3 + HCL---------> Nacl+ Co2 +H20. SODIUM CARBONATE WITH ACID:- Na2CO3 + 2HCL------> 2Nacl + Co2 + H2O. How to test CO2 in the both cases:- Pass the evolved gas in quick lime it will turn to milky white slaked lime water.

Database is an organized collection of data. It contains one or many sheets having several rows_and_columns where values are stored according to fields. 

By grouping objects, we can apply any effects_on the object at the same time. We don't need to_select objects one by one and apply_the same effect like colour, shadow.

Industrial sector helps in modernizing agriculture as it provides various machines, fertilizers, PVC pipes, tractors and others like thrashers and ploughing machines etc. Which were not earlier used when industries were not good to go! Earlier bulls, hoe, dao and other tools were used manually instead of industrial machines.  In reducing poverty too industrial sector plays an important role, it reduces the heavy income dependence of people on agricultural sector by providing jobs and employment in secondary and tertiary sector. In this way it provides income source to people to reduce poverty and also industries are being set up in rural area for decreasing regional differences. 

Daily practice help you to get more marks. You  should be through in ncert book. Refer some guide. Daily atleast spend 1 to 2 hours in mathematics subject it's enough to get good mark and also use some apps to clear your maths question doubts like snapsolve. It is best app to maths question problem solution. Watch more and more videos related topics, theorems etc. 

RESPIRATION is the overall process by which organisms oxidise food to release energy. In most plants, AEROBIC respiration takes place. The respiratory gases are exchanged through the stomata, tiny pores on the lower part of a leaf. The oxygen is then taken to plant cells where glucose is oxidised to produce energy in the mitochondria.

1) Ray passing through lens in a direction parallel to principal axis passes through focus on refraction. 2) Ray passing through principal focus of a lens passes in a direction parallel through principal axis on refraction. 3) Ray passing through the optical center of a lens suffers no deviation even after refraction.