CHEMISTRY 2024-25
Q.1 what is the characteristic of metal.
Ans – malleable,ductile,lustourous
Q.2 non-metal which are store in water.
Ans – phosphorus
Q.3 which gas promote combustion?
Ans – oxygen (o2)
Q.4 which of the following abbertion of LPG.
ANS – liquified petroleum gas
Q.5 which of the following is an example of CNG?
Q.6 which of the following is explosive substance?
(a) coal (b) glass (c) stone piece (d) all of these
Q.7 which of the following is common fire extinguisher?
Ans – carbon dioxide
Q.8 which statement are correct.
(a) generally metal are ductile (b) metal are ductile
(c) generally non-metal are ductile (d) non-metal are ductile
## match the following.
(1) Coke ----------------- purified form of coal used in steel making.
(2) bitumen --------------- a thick black liquid used in road surfacing.
(3) kerosene ------------------ a petroleum product in jet planes.
(4) coal gas -------------------- a gaseous product obtained from coal distillation.
(5) crude oil------------------- an unrefined petroleum found underground.
# one word question.
(1) when first oil well was drilled?
Ans - in 1859, first oil well was drilled in Pennsylvania.
(2) which fossil fuel mined under Rock and earth.
Ans - petroleum is mined from between the rocks under the earth.
(3) name the product of petroleum which is use in extraction of metal.
Ans - Coke is used for extraction of metal.
(4) name fossil fuel used in thermal power station in next generation.
Ans – coal is used for thermal power generation of electricity.
# reason of the following.
(1) why Aluminium foil is wrapped for food item.
Ans - aluminium metal are used in wrapping of food because it has cheaper from other
metals and it has malleable and ductile.
(2) copper cannot displace Zinc .why?
Ans - copper cannot displaces zinc from its salt solution because zinc is more reactive than
copper.
(3) immersion rod why created by metal.
Ans - immersion rod is created from metal because metal are excellent conductor of heat
and electricity.
(4) sodium and potassium stored in kerosene. Why?
Ans - sodium are kept in kerosene to prevent them from reacting with oxygen and moisture
in the air or water which can cause fire and explosion.
(5) draw a labelled diagram of fractional distillation.
#long answer questions.
Q.1 coal formation and types of coal.
Ans - petroleum was formed from organism living in the sea as this organism died their
bodies settled at the bottom of the sea and got covered with layers of sand and clay over
millions of year absence of air high temperature and high pressure transform the day
organism into petroleum and natural gas.
Types of coal.
(1) lignite-colour-brown-carbon%-60 to 70%
(2) bituminous-colour-black-carbon%-70 to 80%
(3) anthracite-colour-shiny black-carbon%-90 to 98%
Q.2 what are the important source of naphthalene balls.
Ans - naphthalene balls are obtained from Coal Tar Coal Tar has bad smell and it has black
thick liquid.
Q.3 LABELLED DIAGRAM OF DISTRUCTIVE DISTILLATION.
