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Recent questions tagged chemistry
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The sum of mole fraction of components of solution is
chemistry
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Aug 11, 2017
by
sulabhchauhan7252889798
1
answer
Medicinal drugs are bitter in taste hence they are added with
cbsc
class 7
olympiad
science
chemistry
t3
asked
Aug 11, 2017
by
meena.p
1
answer
A chemical change could best be demonstrated by
cbsc
class 7
olympiad
science
chemistry
t3
asked
Aug 11, 2017
by
meena.p
1
answer
Water is neither acidic nor alkaline because
cbsc
class 7
olympiad
science
chemistry
t3
asked
Aug 11, 2017
by
meena.p
1
answer
To desalinate water technique used is
cbsc
class 7
olympiad
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chemistry
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asked
Aug 11, 2017
by
meena.p
1
answer
Which of the following is a non metal that remains liquid at room temperature?
cbsc
class 7
olympiad
science
chemistry
t3
asked
Aug 11, 2017
by
meena.p
1
answer
The hardest substance available on earth is
cbsc
class 7
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chemistry
t3
asked
Aug 11, 2017
by
meena.p
1
answer
The inert gas which is substituted for nitrogen in the air used by deep sea divers for breathing, is
cbsc
class 7
olympiad
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chemistry
t3
asked
Aug 11, 2017
by
meena.p
0
answers
Which is the first thing that would happen if a plant could NOT obtain carbon dioxide?
cbsc
class 7
olympiad
science
chemistry
t3
asked
Aug 11, 2017
by
meena.p
1
answer
Low densities, low melting and boiling point and poor conductivity is found in
cbsc
class 7
olympiad
science
chemistry
t3
asked
Aug 11, 2017
by
meena.p
1
answer
In a comparison with a gold atom and hydrogen atom, gold atom is
cbsc
class 7
olympiad
science
chemistry
t3
asked
Aug 11, 2017
by
meena.p
1
answer
Which of the following causes the rusting of iron? <br>a)Oxidation <br> b)Reduction <br> c)Chemical reaction with oxygen <br> d)Chemical reaction with CO
cbsc
class 7
olympiad
science
chemistry
t3
asked
Aug 11, 2017
by
meena.p
1
answer
What are the most common elements in the human body?
cbsc
class 7
olympiad
science
chemistry
t3
asked
Aug 11, 2017
by
meena.p
1
answer
Which of the following is not produced if you mix vinegar (an acid) and sodium bicarbonate (an alkali, or base) together?
cbsc
class 7
olympiad
science
chemistry
t3
asked
Aug 11, 2017
by
meena.p
1
answer
Why can't CO3 2- act both as bronsted acid and base?
chemistry
asked
Aug 11, 2017
by
jalidalam13451
0
answers
How can you make up 425 mL 0.15M HNO3 FROM 68% of HNO3 solution.Density of
chemistry
asked
Aug 10, 2017
by
sheebasangeetha
1
answer
An element crystallizes in fcc lattice with edge length 400pm. Calculate th
chemistry
asked
Aug 10, 2017
by
pratkerkar
1
answer
Which of the following has the highest pH value?
cbsc
class 7
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chemistry
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asked
Aug 10, 2017
by
meena.p
1
answer
Which of the following is the newest element to be discovered and synthesised?
cbsc
class 7
olympiad
science
chemistry
t3
asked
Aug 10, 2017
by
meena.p
1
answer
Chemical change does not take place in case of?
cbsc
class 7
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chemistry
t2
asked
Aug 10, 2017
by
meena.p
1
answer
Which of the following statements is/are true? <br>A. The process of oxidation leads to a gain of electrons. <br>B. The process of oxidation leads to a Toss of electrons. <br>C. The process of reduction leads to a gain of electrons. <br>D. The process of reduction leads to a loss of electron
cbsc
class 7
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chemistry
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asked
Aug 10, 2017
by
meena.p
1
answer
What is the percentage of $CO_2$ in the exhaled air?
cbsc
class 7
olympiad
science
chemistry
t2
asked
Aug 10, 2017
by
meena.p
1
answer
Stainless steel pans are provided with copper bottom because
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class 7
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chemistry
t2
asked
Aug 10, 2017
by
meena.p
1
answer
Some acids react with many materials and burn skin if they come in contact they are
cbsc
class 7
olympiad
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chemistry
t2
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Aug 10, 2017
by
meena.p
1
answer
Haphazard movement of particles suspended in a liquid or gas caused by bombardment of particles by molecules of medium is
cbsc
class 7
olympiad
science
chemistry
t2
asked
Aug 10, 2017
by
meena.p
1
answer
At room temperature, most elements are in which phase of matter?
cbsc
class 7
olympiad
science
chemistry
t2
asked
Aug 10, 2017
by
meena.p
1
answer
Salt, sugar, chalk, sand are all
cbsc
class 7
olympiad
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chemistry
t2
asked
Aug 10, 2017
by
meena.p
1
answer
Nitric acid combines with oxygen to produce brown fumes of
cbsc
class 7
olympiad
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chemistry
t2
asked
Aug 10, 2017
by
meena.p
1
answer
When a solid substance is heated, individual molecules
cbsc
class 7
olympiad
science
chemistry
t2
asked
Aug 10, 2017
by
meena.p
1
answer
On a hot day, a glass containing ice water slowly collects liquid on the outside of the glass. Which statement best explains where this liquid come from?
cbsc
class 7
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chemistry
t2
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Aug 10, 2017
by
meena.p
1
answer
A group of students predicts that folding an index card into a different shape will result in a chemical change. Which step of the scientific process is this?
cbsc
class 7
olympiad
science
chemistry
t2
asked
Aug 10, 2017
by
meena.p
1
answer
Which gas in the atmosphere protects us from harmful ultraviolet radiations?
cbsc
class 7
olympiad
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chemistry
t2
asked
Aug 10, 2017
by
meena.p
1
answer
To study changes that occur during photosynthesis
cbsc
class 7
olympiad
science
chemistry
t2
asked
Aug 10, 2017
by
meena.p
1
answer
To trace path of phosphorus, isotope of phosphorus is added to fertilizers. isotope is
cbsc
class 7
olympiad
science
chemistry
t2
asked
Aug 10, 2017
by
meena.p
1
answer
Study the given set up of an experiment . you will observe that
cbsc
class 7
olympiad
science
chemistry
t1
asked
Aug 10, 2017
by
meena.p
0
answers
Iron occurs as bcc as well as fcc unit cell . If the effective radius of an
chemistry
asked
Aug 10, 2017
by
tanmayporwal11
1
answer
What is difference between oxidation number and oxidation state?
chemistry
asked
Aug 9, 2017
by
satyabrata50535
1
answer
What is 1,2,3,5_tetrachlorobenzene dipolemoment
chemistry
asked
Aug 9, 2017
by
anilraju5889
1
answer
How does maritus yellow react with fabrics?
chemistry
asked
Aug 9, 2017
by
joysankarsaha.js69
0
answers
A separation technique which uses a fractionating column to separate different liquid components in a mixture with different boiling points by heating mixture is called
cbsc
class 7
olympiad
science
chemistry
t1
asked
Aug 9, 2017
by
meena.p
1
answer
The temperature at which no more energy can be removed from matter is called
cbsc
class 7
olympiad
science
chemistry
t1
asked
Aug 9, 2017
by
meena.p
1
answer
Acids are found in many common chemicals, including foods. Acids taste:
cbsc
class 7
olympiad
science
chemistry
t1
asked
Aug 9, 2017
by
meena.p
1
answer
The effect of sting of an ant can be neutralised by rubbing with
cbsc
class 7
olympiad
science
chemistry
t1
asked
Aug 9, 2017
by
meena.p
1
answer
In hydroponics, plant's roots are immersed in solution of dissolved
cbsc
class 7
olympiad
science
chemistry
t1
asked
Aug 9, 2017
by
meena.p
1
answer
When fizzy drinks are made by adding compressed carbon dioxide acid is formed by mixing which is
cbsc
class 7
olympiad
science
chemistry
t1
asked
Aug 9, 2017
by
meena.p
2
answers
If mass of a substance will be lowered its density will be
cbsc
class 7
olympiad
science
chemistry
t1
asked
Aug 9, 2017
by
meena.p
2
answers
Element which is non-metal and is found on right side of periodic table is
cbsc
class 7
olympiad
science
chemistry
t1
asked
Aug 9, 2017
by
meena.p
1
answer
When iron and Sulphur are mixed together at room temperature there is lack of
cbsc
class 7
olympiad
science
chemistry
t1
asked
Aug 9, 2017
by
meena.p
1
answer
A large amount of heat is produced in power plants while energy is released which turns
cbsc
class 7
olympiad
science
chemistry
t1
asked
Aug 9, 2017
by
meena.p
2
answers
Which gas is produced when sludge is digested?
cbsc
class 7
olympiad
science
chemistry
t1
asked
Aug 9, 2017
by
meena.p
1
answer
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