Which of the following statements are CORRECT?
I. Ethanol is a good solvent for organic compounds.
II. Boiling and melting points of ethanol are low with respect to water.
III. Ethanol is used tincture iodine
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Which among the following statements are TRUE regarding synthetic fibre?
I. They melt after catching fire.
II. They are more durable.
III. They are prepared by a number of processes using petrochemicals.
The process of transferring of charge from a charged object to the earth is called ______________.
Valency of an element depends on which of the following?
I. Number of losing electron
II. Number of gaining electron
III. Number of sharing electron
An electron loses potential energy when it
The vast amount of sea weeds present in oceans may produce an endless source of
What is the position of metallic ion and non-metallic ion in a chemical formula?
Which of the following substances cause temporary hardness in water?
1. Mg(HCO3)2
2. Ca(HCO3)2
3. CaCl2
4. MgSO4
There are two types of water hardness: temporary and permanent hardness. Temporary hardness is due to the presence of calcium hydrogen carbonate Ca(HCO3)2(aq) and magnesium hydrogen carbonate Mg(HCO3)2(aq).
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