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CBSE / Chemistry Questions

Total Questions 1082
draw a flow chart showing the conversions of different states of matter.
This was a question in smartindia.The question was - what are the particles accomadated in an atom?The answer smartindia gave in the answersheet is electrons and protons.But as we know an atom consists of three sub-atomic particles.They are-electrons,protons and nuetrons.Then how could the answer be electrons and protons alone.Where is nuetrons??????
What is the Raoults Law exactly? What is it's statement ?
what do you mean by scabies?
A solid weighs 80 gm in air,64 gm in water.Calculate the relative density of solid when kept in water.Also , state the object would float or sink.
Name any two substances whose density cannot be measured accurately.
a student takes about 2 ml ethanoic acid in a dry test tube and adds a pinch of sodium hydrogen carbonate to it.he reports the following observations:a)immediately a colorless and odourless gas evolves with a brisk effervescence.b)gas turns lime water milky when passed through it.c)gas burns with an explosion .d)gas extinguishes the burning splinter that is brought near it. which are the three correct observations?
we need 20% aqueous solution of sodium hydroxide for the study of saponification reaction.when we open the lid of the bottle containing solid sodium hydroxide we observe it in which form? a)colorless transparent beads b)small white beads c)white pellets/flakes d)fine white powder
while studying saponification reaction,a student measures the temperature of the reaction mixture and also find its nature using blue/red litmus paper.on the basis of his observations the correct conclusions would be: a)reaction is exothermic and mixture is acidic b)reaction is endothermic and mixture is acidic c)reaction is endothermic and mixture is basic d)reaction is exothermic and reaction is basic. which type of NaOH is used for Saponification?
explain different type of hybridizations and it's geometrical shapes?
how to calculate the average atomic mass of bromine atom Given; 2 isotopes 79/35 Br[49.7] and 81/35 Br[50.3]
Can the element palladium bes used as an energy source?
Essay on sanitation
state the positions of isotopes of the same element in the modern periodic table
state the positions of isotopes of the same element hydrogen in the modern periodic table
Draw two possible isomers of the compound with molecular formula C3H6O and write their names
what is chromium?
Difference between oils and fats.
Will Ethanol form micelles?
properties of some elements are given.name them if possible and where would we locate this elements? 1.an element with variable valency(more than one)stored under water. 2.an element which is tetra valent in organic chemistry.