Revision Flashcards
The universal solvent
water
A homogeneous mixture of solute in a solvent
solution
A solution in which the amount of solute is relatively large
concentrated solution
what is the nature of true solution?
it is clear, transparent and homogeneous
The 3 metals which can react with cold water to produce HYDROGEN
K, Na, Ca
The metal which reacts reversibly with steam to produce HYDROGEN
IRON
Which of the foloowing does not give hydrogen on reacting with dilute HCl?
Cu, Zn, Fe, Mg
Copper
Potassium is kept in kerosene oil because
It reacts with the moisture in air and catches fire
1 atm is qual to ______ torr
760 torr
At high altitude atmospheric pressure is _____
low
Pressure -temperature relationship is given by
Charles law
If pressure is doubled for a fixed mass of a gas, volume will become
half times
What is the physical state of bromine?
liquid
how many electrons are present in the outermost orbit of alkaline earth metals?
two
Which element of group 17 is solid in nature?
iodine
down the group metallic character :
increases
Respiration is an example of which type of reaction? exothermic or endothermic?
exothermic
Name the acid that is released when a bee stung our body
formic acid
Name the least reactive element among halogens
iodine
The products obtained by thermal decomposition of Calcium carbonate
Calcium oxide and carbon dioxide
How many physical states of water exist?
3
chemical formula of Glauber’s salt
Na2SO4.10H2O
The acid used in drying of gases
conc H2SO4
with the rise in temperature the solubility of sodium chloride in water:
increases only a little
The mass ratio of Hydrogen to oxygen in water
1:8
The catalyst and the promotor used for the formation of ammonia gas is:
Fe and Mo respectively
When crystals of lead nitrate are heated strongly in a dry test tube, a ______colour residue is left
yellow
The salt that undergoes photchemical decomposition is
silver nitrate
A subsatnce that does not contain water of crystallization is
salts: blue vitriol, washing soda crystals, common salt and Glauber’s salt
common salt
Ferric chloride is ______ salt
deliquescent
How many electrons do the outermost shell of an atom accommodate?
8
Which of the following is a covalent compound?
sodium chloride, carbon tetrachloride, magnesium chloride, calcium chloride
carbon tetrachloride
The bond formed between nitrogen atoms in a molecule is :
Triple covalent bond
Calcium is not used in laboratory preparation of hydrogen because:
It is very expensive
Which metal is given hydrogen on reacting with water, acid and alkali?
Fe,Mg, Zn, Pb
Zinc
Nitric acid is not used in the preparation of hydrogen from metals. Why?
It is a powerful oxidising agent and oxidizes the the hydrogen formed to water
Two metals which can react with very dilute HNO3 at low tempeartures
Mg and Mn
What willl be the minimum pressure required to compress 2L of gas at 1 bar to 1L at 25°C
2 bar
The absolute temperature that corresponds to 26°C
299K
On adding water to sodium the solution formed is
alkaline
The gas which has rotten egg smell
H2S
Hydrogen is collected through ____________________ method
Water displacement method
Name : The substance that can remove combined elements of water in the ratio of 2:1 ( H and O) from a compound.
Dehydrating agent
Elements of group IIIB ( gp no. 3) of the seventh period.
Actinides
Elements that have two outermost shells incomplete
Transition elements
The process in which an atom or ion loses electron
oxidation
A substance that transfers hydrogen to another substance, or removes oxygen from that substance
Reducing agent
The force that a gas exerts in unit cross-sectional area on the walls of its container
Pressure
The process of gradual mixing of two substances kept in contact by molecular motion
diffusion
The elements of lanthanides and actinides collectively known as
Inner transition elements
