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Recent questions tagged science
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To prepare ammonia gas, gaseous mixture of
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class 9
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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
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Aug 30, 2017
by
meena.p
1
answer
Molten sodium chloride conducts electricity due to the presence of
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class 9
olympiad
science
chemistry
t2
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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
0
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
cbsc
class 9
olympiad
science
chemistry
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asked
Aug 30, 2017
by
meena.p
1
answer
The sequence of steps for separating a mixture of salt, sand and camphor is:
cbsc
class 9
olympiad
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chemistry
t2
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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:
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class 9
olympiad
science
chemistry
t2
asked
Aug 30, 2017
by
meena.p
1
answer
Elements whose oxidation number is increased are
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class 9
olympiad
science
chemistry
t2
asked
Aug 30, 2017
by
meena.p
1
answer
On contact with oxygen, Rubidium forms
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class 9
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science
chemistry
t2
asked
Aug 29, 2017
by
meena.p
1
answer
Which of the following is not matter
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class 9
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chemistry
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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
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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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chemistry
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Aug 29, 2017
by
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answer
In Rutherford's experiment, α particles were deflected because of
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class 9
olympiad
science
chemistry
t1
asked
Aug 29, 2017
by
meena.p
1
answer
The number of valence electrons determines:
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Aug 29, 2017
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An element X has valency equal to 3. What will be its formula with carbonate ions?
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class 9
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Aug 29, 2017
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1
answer
Fog is a solution of
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Aug 29, 2017
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1
answer
On industrial scale sodium metal is prepared by electrolysis of fused
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chemistry
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Aug 29, 2017
by
meena.p
1
answer
At constant pressure average kinetic energy of gas molecules increases 2 times if
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Aug 29, 2017
by
meena.p
1
answer
Shielding effect across period
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Aug 29, 2017
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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$= 9.1 \times 10^{-31}\;kg$
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class 9
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Aug 29, 2017
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1
answer
Filtration as a method of separation can be used for mixtures that are
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class 9
olympiad
science
chemistry
t1
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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
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class 9
olympiad
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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
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class 9
olympiad
science
chemistry
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Aug 29, 2017
by
meena.p
1
answer
On contact with oxygen, Rubidium forms
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class 9
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chemistry
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Aug 29, 2017
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answer
Nitrous oxide, commonly called laughing gas, has been a matter of concern to environmentalists recently because
cbsc
class 8
olympiad
science
chemistry
t10
asked
Aug 29, 2017
by
meena.p
1
answer
The word atom is from a Greek word meaning:
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class 8
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Aug 29, 2017
by
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1
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Which of the following alloys is used for making magnets ?
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class 8
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Aug 29, 2017
by
meena.p
1
answer
Polythene and PVC are examples of
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Aug 29, 2017
by
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answer
When electric current is passed through a conducting solution, there is a change of colour of the solution. This indicates
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class 8
olympiad
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chemistry
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Aug 29, 2017
by
meena.p
2
answers
Trees help in reducing the pollution of our environment. Lakhs of trees are planted by people in the month of July every year. The occasion is called
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class 8
olympiad
science
chemistry
t10
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Aug 29, 2017
by
meena.p
1
answer
Choose the correct statement about inflammable substances from the following. They have:
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class 8
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chemistry
t10
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Aug 29, 2017
by
meena.p
1
answer
Which non metal is essential for our life and inhale during breathing?
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class 8
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chemistry
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Aug 29, 2017
by
meena.p
1
answer
The fibres manufacture by petrochemicals are
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class 8
olympiad
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chemistry
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Aug 29, 2017
by
meena.p
1
answer
Smog =
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class 8
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chemistry
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Aug 29, 2017
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meena.p
1
answer
Carbon monoxide in vehicle exhaust causes
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class 8
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chemistry
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Aug 29, 2017
by
meena.p
1
answer
The presence of which of the following salts in water causes corrosion in steam boilers ?
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class 8
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chemistry
t10
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Aug 29, 2017
by
meena.p
1
answer
During electrolysis of water, oxygen gas is deposited at which electrode?
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class 8
olympiad
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chemistry
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Aug 29, 2017
by
meena.p
1
answer
Generally metallic oxides are basic and non-metallic oxides are acidic in nature. Solution of which of the following oxides in water will change the colour of blue litmus to red?
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class 8
olympiad
science
chemistry
t10
asked
Aug 29, 2017
by
meena.p
1
answer
Which of the following groups contain all synthetic substances?
cbsc
class 8
olympiad
science
chemistry
t10
asked
Aug 29, 2017
by
meena.p
1
answer
What compound is a common component of air pollution, but is essential in the upper atmosphere to protect life on earth?
cbsc
class 8
olympiad
science
chemistry
t9
asked
Aug 28, 2017
by
meena.p
1
answer
Shyam’s uncle has set up an electroplating factory near his village. He should dispose off the waste of the factory
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class 8
olympiad
science
chemistry
t9
asked
Aug 28, 2017
by
meena.p
1
answer
When a copper vessel is exposed to moist air for long, it acquires a dull green coating. The green material is a mixture of
cbsc
class 8
olympiad
science
chemistry
t9
asked
Aug 28, 2017
by
meena.p
1
answer
Choose the incorrect statement from the following. Forest fires are usually due to:
cbsc
class 8
olympiad
science
chemistry
t9
asked
Aug 28, 2017
by
meena.p
1
answer
Dead organisms are transformed into petroleum & natural gas in
cbsc
class 8
olympiad
science
chemistry
t9
asked
Aug 28, 2017
by
meena.p
1
answer
Explosion takes place because of
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class 8
olympiad
science
chemistry
t9
asked
Aug 28, 2017
by
meena.p
1
answer
The purest form of iron is —
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class 8
olympiad
science
chemistry
t9
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Aug 28, 2017
by
meena.p
1
answer
Chemical effect of electric current is also known by which term?
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class 8
olympiad
science
chemistry
t9
asked
Aug 28, 2017
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meena.p
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