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Recent questions tagged class 9
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The concentration of a solution indicates
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Sep 4, 2017
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answer
Filtration as a method of separation can be used for mixtures that are
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class 9
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Sep 4, 2017
by
meena.p
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The movement of molecules from a higher concentration to a lower concentration is known as?
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Sep 4, 2017
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The n value of the valence shell of an element indicates its?
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Sep 4, 2017
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meena.p
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When the electron is present in a particular orbit , it?
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Sep 4, 2017
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Who gave the idea that elements can be differentiated by their properties?
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class 9
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Sep 1, 2017
by
meena.p
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answers
At a particular temperature solution which cannot dissolve more solute is called
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class 9
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chemistry
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Sep 1, 2017
by
meena.p
1
answer
By passing hydrogen gas through vegetable oil, it is converted in to
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class 9
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chemistry
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Sep 1, 2017
by
meena.p
1
answer
For a certain reaction $PV = 2 dm^3 atm$ and volume is $4 dm^3$ then corresponding pressure is
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class 9
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science
chemistry
t3
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Sep 1, 2017
by
meena.p
1
answer
At constant pressure average kinetic energy of gas molecules increases 2 times if
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class 9
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science
chemistry
t3
asked
Sep 1, 2017
by
meena.p
0
answers
Metals difficult to oxidize are called
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class 9
olympiad
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chemistry
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Sep 1, 2017
by
meena.p
1
answer
How many elements are present in two molecules of aspirin? The formula for aspirin is $C_9H_8O_4$.
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class 9
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chemistry
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Sep 1, 2017
by
meena.p
1
answer
In the separation of dyes A and B by chromatography, component B has more solubility in the solvent. Which component will rise faster?
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class 9
olympiad
science
chemistry
t3
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Sep 1, 2017
by
meena.p
1
answer
The number of valence electrons determines:
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class 9
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chemistry
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asked
Aug 31, 2017
by
meena.p
1
answer
The mass of a single atom of an element X is $2.65 \times 10^{-23}g$. The atomic mass and name of the element is:
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class 9
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Aug 31, 2017
by
meena.p
1
answer
Soda water is a solution of carbon dioxide in water. This solution is composed of
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class 9
olympiad
science
chemistry
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asked
Aug 30, 2017
by
meena.p
1
answer
Some statements about the Rutherford’s a-particle scattering experiment are given : I. As most of the a-particles passed through the gold foil without getting deflected, the positive charge of the atom occupies the entire space. II. As very few particles were deflected from their path, very little space inside the atom is empty. III. As a very small fraction of a-particles were deflected by 180°, all the positive charge and mass of the gold atom were concentrated in a very small volume within the atom. Select the correct statement(s).
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Aug 30, 2017
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The characteristic smell of rotten egg spreads throughout the room. This is due to
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class 9
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Aug 30, 2017
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meena.p
1
answer
Which one of the following is not an element of first transition series.?
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Aug 30, 2017
by
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answer
Alpha particles are .......nuclie that are doubly positively charged?
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Aug 30, 2017
by
meena.p
1
answer
Which one of the following is not included in the concept of four elements.
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Aug 30, 2017
by
meena.p
1
answer
Non-metals like to _____ electrons to become ______ ions.
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class 9
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chemistry
t2
asked
Aug 30, 2017
by
meena.p
1
answer
As compared to beryllium, magnesium is
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class 9
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chemistry
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Aug 30, 2017
by
meena.p
1
answer
At constant pressure average kinetic energy of gas molecules increases 2 times if
cbsc
class 9
olympiad
science
chemistry
t2
asked
Aug 30, 2017
by
meena.p
1
answer
To prepare ammonia gas, gaseous mixture of
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class 9
olympiad
science
chemistry
t2
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Aug 30, 2017
by
meena.p
1
answer
Since atoms are neutral, the number of electrons is equal to the number of:
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class 9
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Aug 30, 2017
by
meena.p
1
answer
In a sample of ethyl ethanoate $(CH_3COOC_2H_5 )$ the two oxygen atoms have the same number of electrons but different number of neutrons. Which of the following is the correct reason for it?
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class 9
olympiad
science
chemistry
t2
asked
Aug 30, 2017
by
meena.p
1
answer
Molten sodium chloride conducts electricity due to the presence of
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class 9
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chemistry
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asked
Aug 30, 2017
by
meena.p
1
answer
Out of 1 g of oxygen gas, 1 g of oxygen atoms and 1g of ozone , maximum number of atoms are present in:
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class 9
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chemistry
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Aug 30, 2017
by
meena.p
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answers
When a gold foil is bombarded by a beam of α particle, only a few of them get deflected whereas most go straight undeflected. This is because
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class 9
olympiad
science
chemistry
t2
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Aug 30, 2017
by
meena.p
1
answer
The sequence of steps for separating a mixture of salt, sand and camphor is:
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class 9
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chemistry
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Aug 30, 2017
by
meena.p
1
answer
Wet clothes are kept for drying. Which of the following does not help them in drying:
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class 9
olympiad
science
chemistry
t2
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Aug 30, 2017
by
meena.p
1
answer
Angelo required an aqueous solution of sodium chloride. He made the solution by dissolving salt in:
cbsc
class 9
olympiad
science
chemistry
t2
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Aug 30, 2017
by
meena.p
1
answer
Elements whose oxidation number is increased are
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class 9
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chemistry
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Aug 30, 2017
by
meena.p
1
answer
On contact with oxygen, Rubidium forms
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class 9
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chemistry
t2
asked
Aug 29, 2017
by
meena.p
1
answer
Which of the following is not matter
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Aug 29, 2017
by
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1
answer
a. Oxygen: diatomic b. Ozone :_______
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class 9
olympiad
science
chemistry
t1
asked
Aug 29, 2017
by
meena.p
1
answer
What is the formula for a gas at room temperature?
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class 9
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science
chemistry
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Aug 29, 2017
by
meena.p
1
answer
In Rutherford's experiment, α particles were deflected because of
cbsc
class 9
olympiad
science
chemistry
t1
asked
Aug 29, 2017
by
meena.p
1
answer
The number of valence electrons determines:
cbsc
class 9
olympiad
science
chemistry
t1
asked
Aug 29, 2017
by
meena.p
1
answer
An element X has valency equal to 3. What will be its formula with carbonate ions?
cbsc
class 9
olympiad
science
chemistry
t1
asked
Aug 29, 2017
by
meena.p
1
answer
Fog is a solution of
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class 9
olympiad
science
chemistry
t1
asked
Aug 29, 2017
by
meena.p
1
answer
On industrial scale sodium metal is prepared by electrolysis of fused
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class 9
olympiad
science
chemistry
t1
asked
Aug 29, 2017
by
meena.p
1
answer
At constant pressure average kinetic energy of gas molecules increases 2 times if
cbsc
class 9
olympiad
science
chemistry
t1
asked
Aug 29, 2017
by
meena.p
1
answer
Shielding effect across period
cbsc
class 9
olympiad
science
chemistry
t1
asked
Aug 29, 2017
by
meena.p
1
answer
A student weighs $30\;kg$. Suppose his body is entirely made of electrons. How any electrons are there in his body? Mass of an electron$= 9.1 \times 10^{-31}\;kg$
cbsc
class 9
olympiad
science
chemistry
t1
asked
Aug 29, 2017
by
meena.p
1
answer
Filtration as a method of separation can be used for mixtures that are
cbsc
class 9
olympiad
science
chemistry
t1
asked
Aug 29, 2017
by
meena.p
1
answer
A chemistry poster indicated information on the number of particles in a newly discovered atom. According to the information in the poster the atomic number is: Protons: 113 Electrons: 113 Neutrons: 281
cbsc
class 9
olympiad
science
chemistry
t1
asked
Aug 29, 2017
by
meena.p
1
answer
When a bottle of soda water is opened, carbon dioxide escapes, producing a fizz. This is due to:
cbsc
class 9
olympiad
science
chemistry
t1
asked
Aug 29, 2017
by
meena.p
1
answer
Which of the following has minimum spaces among the particles
cbsc
class 9
olympiad
science
chemistry
t1
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Aug 29, 2017
by
meena.p
1
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