What are the uses of Centrifugation in daily life? (Pls. mention at least five examples)
write any 2 applications of chromatography
out of rain water ,distilled water which is a pure substance
What is the difference in apparatus used for distillation and fractional distillation ?
why sollidified butter is gel and liquid butter an emulsion?
What happens when dilute HCl is poured on a mixture of iron and sulphur.
Beakers A and B contains a solution of potassium permanganate and a mxiture of chalk powder in water . Mention one point of difference that you would observe in the two mixtures . On the basis of the observation categorise the two as homogeneous and hetrogeneous mixture.
suggest separation technique
1,mercury and water
2.potassium chloride and ammonium chloride
3.common salt,water and sand
4.kerosene oil,water and sand
with the help of labelled diagram describe an activity to separate a mixture containing ammoniun chloride and salt
classify the following as element,compound and mixture: iron,sea water,milk
the rate of diffusion of liquids is higher than that of solids. why?
Calculate the mass of water and mass of glucose required to make 250g of 40% solution of glucose??
pls answer as soon as possible!!!!!!!
name the process by which common salt is obtained from sea water.
7g of iron fillings and 4g of sulphur powder iz ttreated with dil. h2so4 at room temperature. name the gas produced?
1) same mixture iz heated strongly and heated with dil h2so4 which gas would be produced?
2) what is the cause of this differencein results od chemical reaction in differnt conditions?
Which gas forms the liquid first as the air is cooled?
An object is moving with uniform speed in a circle of radius r. Calculate the distance and displacement (a) When it complete half the circle (b) When it completes full circle (c) What type of motion does the object possess ? (Justify your answer)
Calculate the mass of glucose and water required to make 250g of 25% solution of glucose.
what is crystallization?
WHY DO OUR PALM FEEL COLD IF WE PUT SOME ACETONE OR PERFUME ON IT.?????
what do you observe in the china dish
do all the crystals look alike?
Classify the following into elements, compound and mixtures:
Marble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, water, chalk.
Name a substance which dissolves in carbon
disulphide
What are the uses of Centrifugation in daily life? (Pls. mention at least five examples)
write any 2 applications of chromatography
out of rain water ,distilled water which is a pure substance
What is the difference in apparatus used for distillation and fractional distillation ?
why sollidified butter is gel and liquid butter an emulsion?
What happens when dilute HCl is poured on a mixture of iron and sulphur.
Beakers A and B contains a solution of potassium permanganate and a mxiture of chalk powder in water . Mention one point of difference that you would observe in the two mixtures . On the basis of the observation categorise the two as homogeneous and hetrogeneous mixture.
suggest separation technique
1,mercury and water
2.potassium chloride and ammonium chloride
3.common salt,water and sand
4.kerosene oil,water and sand
(a) liquid and gas.
(b) liquid and liquid.
(c) liquid and solid.
Give one example of each.
with the help of labelled diagram describe an activity to separate a mixture containing ammoniun chloride and salt
classify the following as element,compound and mixture: iron,sea water,milk
the rate of diffusion of liquids is higher than that of solids. why?
Calculate the mass of water and mass of glucose required to make 250g of 40% solution of glucose??
pls answer as soon as possible!!!!!!!
name the process by which common salt is obtained from sea water.
7g of iron fillings and 4g of sulphur powder iz ttreated with dil. h2so4 at room temperature. name the gas produced?
1) same mixture iz heated strongly and heated with dil h2so4 which gas would be produced?
2) what is the cause of this differencein results od chemical reaction in differnt conditions?
Which gas forms the liquid first as the air is cooled?
An object is moving with uniform speed in a circle of radius r. Calculate the distance and displacement (a) When it complete half the circle (b) When it completes full circle (c) What type of motion does the object possess ? (Justify your answer)
Calculate the mass of glucose and water required to make 250g of 25% solution of glucose.
Answer in both cases
(It is practical based question)
W is a very reactive metal, reacts vigorously with
oxygen and water therefore, stored in (l)
___X___ is a non-metal, soft and dull and forms (2) oxides with oxygen.
Y is very reactive ___(3)___ , catches fire if exposed to air therefore, stored in water.
___Z___ does not react with dilute hydrochloric acid even on heating but it reacts with sulphuric acid. When it is exposed to moist air for long, it acquires a dull ___(4)____ coating.
A. W-Na, I-Water; X-S, 2-Basic; Y-P, 3-Meta1•, Z-Cu, 4-Reddish brown
B. W-Mg, I -Kerosene; X-P, 2-Acidic; Y-Si, 3-Metal; Z-Ag, 4-Reddish brown
C. W-Na, I-Kerosene; X-S, 2-Acidic•,
Y-P 3-Non-metal; Z-Cu, 4-Green
D. W-Al, I-water; X-Zn, 2-Amphoteric;
Y-P 3-Non-metal; Z-CU, 4-Green.
what is crystallization?
WHY DO OUR PALM FEEL COLD IF WE PUT SOME ACETONE OR PERFUME ON IT.?????
what do you observe in the china dish
do all the crystals look alike?
Classify the following into elements, compound and mixtures:
Marble, Air, Gold, Brass, Sand, Diamond, Graphite, Petroleum, Common salt, water, chalk.
Name a substance which dissolves in carbon
disulphide