Advertisements
Advertisements
प्रश्न
An element A is soft and can be cut with a knife. This is very reactive to air and cannot be kept open in air. It reacts vigorously with water. Identify the element from the following
विकल्प
Mg
Na
P
Ca
Advertisements
उत्तर
Na
Explanation -
Sodium is a third-period alkali metal which is a soft metal and highly reactive. sodium is stored under kerosene and whenever it comes in contact with air or water it reacts vigorously.
APPEARS IN
संबंधित प्रश्न
Fill in the blank in the following sentence:
The number of single covalent bonds in C2H2 molecule are ...........
State any two uses of graphite.
Why are covalent compounds generally poor conductors of electricity?
A saturated hydrocarbon has fifty hydrogen atom in its molecule. The number of carbon atoms in its molecule will be
(a) twenty five
(b) twenty four
(c) twenty six
(d) twenty seven
Give the formulae of the chlorides of the elements X and Y having atomic numbers of 3 and 6 respectively. Will the properties of the two chlorides be similar or different? Explain your answer.
What is the difference between ionic compounds and covalent compounds?
Give the characteristic properties of covalent compounds.
For each compound mentioned above give the formulae of ions formed in aqueous solution.
State the type of bonding in the following molecule.
Hydroxyl ion
Draw an electron dot structure of the following molecule. (Without showing the circle) :
Methane
Write answer as directed.
What causes the existance of very large number of carbon compound ?
Give examples for the following:
Two gaseous non polar compounds.
Explain the following:
Covalent compounds are generally gases or liquids or soft solids.
Give reason as to why hydrogen chloride can be termed as a polar covalent compound.
An element L consists of molecules.
Why L is heated with iron metal, it forms a compound FeL. What chemical term would you use to describe the change undergone by L?
Fill in the blank from the choice given in bracket.
The compound that does not have a lone pair of electrons is ___________. (Water, Ammonia, carbon tetrachloride)
List two differences between the properties exhibited by covalent compounds and ionic compounds.
Assertion (A): Melting point and boiling point of ethanol are lower than that of sodium chloride.
Reason (R): The forces of attraction between the molecules of ionic compounds are very strong.
Non-polar covalent compounds are ______ conductors of heat and electricity.
