W3.CSS
An atom has 8 electrons, 8 protons and 8 neutrons. What will be its atomic moss?
Neon has atomic number 10, the number of electrons In L-shell will be:
Most abundantly found element in the Birth's crust is:
The metal prepared artificially:
Which one is not a metalloid among the following elements?
Silicon
Metal found in liquid at common temperature:
Which metal exists in liquid form?
Hydrogen gas was discovered by:
The most abundantly found element In the Birth's crust Is:
Percentage of carbon dioxide present in air by volume;
In whose preparation is manganese dioxide as a catalyst:
Which method Is applied for the removal of suspended impurities?
Compounds which can cause temporary hardness of water are:
Aeration
Bicarbonates of calcium and magnesium
Sulphates of calcium and magnesium
Chlorides of calcium and magnesium
Clark’s method is applied:
For removal of water pollution
For removal of temporary hardness of water
For removal of permanent hardness of water
For removal of water logging and salinity
For removal of temporary hardness of water
Gypsum or calcium sulphate is used:
To remove impurities present in water
To remove hardness of water
To eradicate water logging
To eradicate salinity
The height of mercury column in the Barometer at sea-level:
The atomic number of nitrogen in 7 and its atomic mass is 14. The number of neutrons is:
Which one turns lime water milky when passed through:
Turns blue Litmus paper into red:
Which are occupies 21% volume of our atmosphere?
Which one is used in the preparation of magnalium?
Magnesium and Aluminum
Iron and Sodium
A leaf has numerous tiny pores in:
Lower epidermis
Outside epidermis
Upper epidermis
Central epidermis
Which one is used in the preparation of gun powder?
An atom of an element has seven electrons in its outermost shell. Its valency will be:
When one is heavier than air?
