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प्रश्न
What elements do the following compounds contain ?
Sugar, Common salt
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उत्तर
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).
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संबंधित प्रश्न
Name the terms for the particles of matter which may or may not have independent existence.
Define the following term of Matter .
The three important metalloids are.............................. and ..........................
Which of the following are ‘pure substances’ ?
Ice, Milk, Iron, Hydrochloric acid, Calcium oxide, Mercury, Brick, Wood, Air
The elements which normally exist in the liquid state are :
There are three substances X, Y and Z. The substance X does not have a fixed melting point or boiling point and it still shows the individual properties of its constituents. The substance Y is a pure substance which occurs in nature as such. The substance Y has a fixed melting point and boiling point but it cannot be broken down into simpler substances by any chemical means. The substance Z is also a pure substance whose properties are entirely different from those of its constituents. The substance Z can, however, be divided by electrolysis into two substances which belong to the same class of substances as Y.
- What type of substance could X be ? Name one substance like X.
- What type of substance could Y be ? Name one substance like Y.
- What type of substance could Z be ? Name one substance like Z.
- Which process involves absorption or release of an appreciable amount of energy : formation of substance X or formation of substance Z ?
- Name the three groups into which all the substances like Y are divided on the basis of their properties.
Choose one term from the following which includes the other three :
aerosol, emulsion, colloid, sol
Fill in the following blank :
Milk is a .................... solution but vinegar is a .................... solution.
What is the effect of temperature on the solubility of solids in liquids ?
State whether the following statement are true or false :
Alcohol can be separated from a mixture of alcohol and water by a separating funnel.
Fill in the following blanks with suitable words :
A mixture of kerosene and petrol can be separated by .....................
How is scrap iron separated from a heap of waste materials in factories?
How will you separate iron pins from sand ?
The material which is added to water during purification process at the water works so as to disinfect it is :
You are given a mixture of iodine in alcohol called tincture iodine. Which method will you use to recover both, iodine as well as alcohol, from this mixture ?
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 ?
The property which allows the metals to be hammered into their sheets is ______.
Seema visited a Natural Gas Compressing Unit and found that the gas can be liquefied under specific conditions of temperature and pressure. While sharing her experience with friends she got confused. Help her to identify the correct set of conditions
Which of the following statements are true for pure substances?
(i) Pure substances contain only one kind of particles
(ii) Pure substances may be compounds or mixtures
(iii) Pure substances have the same composition throughout
(iv) Pure substances can be exemplified by all elements other than nickel
Write a scientific reason.
Lemon sherbat has sweet, sour and salty taste and it can be poured in a glass.
