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CBSE Questions

Total Questions 9982
what are computer virus?what are the most dangerous viruses(atleast five and some explanation about them)?which is the best anti virus in world(any five)?
Shall we not look into the matter? Can you change this into passive voice?
Tell him to leave the office. The sentence may be changed into passive voice.
CAN U TELL ME HOW THE DINOSOURS EXIST FROM THIS WORLD &THE REASON??
WHAT ARE HOMOLOGOUS ORGANS?
what is a black hole
what's the role of ribosome in translation ?
why tRNA binds to amino acid & mRNA codon during protein synthesis ?
difference between mRNA and tRNA ?
WHAT IS HOMOSPHERE AND HETEROSPHERE?
what is mathematics?
convert- a)ethyne to bromo ethane b)1-bromopropane to 2-bromopropane
explain the following a)pbcl4 is less stable than SnCl4 b)boric acid is monobasic non protic acid c)SnCL4 is good reducing agent d)BCl3 is better lewis acid than BF3 e)co2 is gas while silica is solid
how is hydrogen peroxide used to restore the original colour of old lead paintings?give an chemical equation to show that it acts as both oxidising and reducing agents????
how to balance an equation with oxidation no. method and half reaction method?? step by step explain please???
what is common ion effect?
different types of snakes.Discribe five of them.
Why does SWEAT stink???
What is ingestion?
prove that 3+root 2 is irrational.