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CBSE / Chemistry Questions

Total Questions 1082
State method by which we can prepare colloid of starch.
Mallika's mother was suffering from cold and cough.Mallika prepared tea for her mother.She boiled water in a pan,then she added tea leaves,sugar and milk to it.She filtered the tea in a cup and served to her mother. Identify solute,solvent,residue and filtrate in this activity.
Differences and similarities between boiling and evaporation.
metals and non metals
what is meant by galvanization ?
what is osmosis
WHAT DO YOU MEAN BY NEUTRALIZATION
WHY THE MILK IS TAKING SO MUCH TIME TO PRODUCE CURD
what is the chemical formula of potasium permagnate?
Galvanised articles are protected against rusting even if the zinc coating is broken.How?
WHAT IS METAL HYDROXIDE
HOW WILL YOU PROVE THAT A GIVEN SALT IS A CARBONATE OF METAL?
WHAT IS THE CHEMICAL EQUATION OF PHENOHTHLON?
WHAT IS NEUTRILISATION?CAN YOU GIVE ME SOME EXAMPLES?
1.why does the rate of a reaction not remain constant throughout the reaction process? 2. the slope of the line for the graph of Log k v/s 1/t for the reaction N2O5->2NO2 +1/2 O2 is -5000. find activation energy. 3. how much time is required for 3/4th of PH3 to decompose
WHY? 1.NH3 is a strong base than PH3. 2. in the structure of HNO3, the N-O bond is shorter than the N-OH bond 3.all the P-Cl bond in PCl5 are not equivalent 4. NH3 is good complexing agent
WHAT IS GLYOLYSIS
liquid generally have lower density as compared to solid.But you must have observed that ice floating on water.
NAME TWO METALS WHICH WILL DISPLACE HYDROGEN FROM DILUTE ACIDS AND TWO METALS WHICH WILL NOT
YOU ARE GIVEN A HAMMER,A BATTERY ,A BULB ,WIRES AND A SWITCH. 1.HOW COULD USE TO DISTINGUISH BETWEEN SAMPLES OF METALS AND NON METALS? 2.ASSESS THE USEFULNESS OF THESE TESTS IN DISTINGUISHING BETWEEN METALS AND NON METALS?