Advertisements
Advertisements
Question
What elements do the following compounds contain ?
Sugar, Common salt
Advertisements
Solution
Formula of sugar is C12H22O11 . So, the elements present in sugar are carbon (C), hydrogen (H) and oxygen (O).
Formula of sodium chloride is NaCl. So, the elements present in sodium chloride are sodium (Na) and chlorine (Cl).
APPEARS IN
RELATED QUESTIONS
The smallest unit of matter that exists freely in nature is called ...........
Classify the following into elements, compounds and mixtures:
- Sodium
- Soil
- Sugar solution
- Silver
- Calcium carbonate
- Tin
- Silicon
- Coal
- Air
- Soap
- Methane
- Carbon dioxide
- Blood
Name two processes which provide the best evidence for the motion of particles in matter.
In a beam of sunlight entering a room, we can sometimes see dust particles moving in a haphazard way in the air. Why do these dust particles move?
The best evidence for the existence and movement of particles in liquids was provided by :
What is meant by saying that metals are sonorous ?
What are the three general classes of matter ? Give one example of each type.
Which of the following are compounds ?
- CO
- No
- NO
- Co
What is the name of the clear liquid formed when a solid dissolves in a liquid ?
Choose the correct answer.
A 5 per cent sugar solution means that :
Fill in the following blank :
A colloid is a ..............mixture and its components can be separated by the technique known as ...............
One of the following does not show Tyndall effect. This one is :
100 mL of water at room temperature of 25°C is taken in a beaker and a little of solid S is dissolved in it by stirring to obtain a solution X. More and more of solid S is added to the solution with constant stirring, while keeping the temperature of solution constant at 30°C. After some time it is observed that no more solid dissolves in water and at the same time some solid is also left undissolved at the bottom of the beaker.
- The contents of beaker are filtered through a filter paper to obtain solution Y in the form of a filtrate.
- What name is given to solutions like X ?
- What name is given to solutions like Y ?
- What will you observe if the solution Y at 30°C is cooled down to 10°C by keeping the beaker in crushed ice ? Why ?
- What term is used to denote the amount of solid dissolved in 100 grams of water in a solution lie Y ?
Describe the method of separating a mixture containing common salt, sand and ammonium chloride.
Explain how, impure copper sulphate can be purified by crystallisation.
The material which is added to water during purification process at the water works so as to disinfect it is :
The best way to recover sugar from an aqueous sugar solution is :
The liquid air has three components X, Y and Z whose boiling points are : –186°C, –183°C and –196°C,
respectively. When liquid air is fed into a tall fractional distillation column from near its bottom and warmed
up slowly :
(a) Which component will be collected from near the bottom of the fraction distillation column ? Why ?
(b) Which component will be collected from the top part of the fractional distillation column ? Why ?
(c) Which component will be collected from the middle part of the fractional distillation column ? Why ?
(d) What could the component X, Y and Z be ?
Complete the following table:
| S.No. | CELSIUS | KELVIN |
| 1. | 90°C | 363 K |
| 2. | ______ | 283 K |
| 3. | 63 °C | ______ |
| 4. | 250°C | ______ |
| 5. | ______ | 303 K |
______ is used for industrial refrigeration and transporting frozen food.
