Chemistry-
General
Easy

Question

The salts of _____ do not cause hardness of water :

  1. sodium    
  2. magnesium    
  3. potassium    
  4. both (A) and (C)    

The correct answer is: both (A) and (C)

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Light a candle and observe its flame, you will find that it is spindle-shaped and has different colours in different regions. The flame has three main zones depending on the amount of air it receives.
Which zone is least hot zone

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Which zone is least hot zone

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What does this experiment show?

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Inflammable substances have an ignition temperature :

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Carbon exist in two allotropic forms (i) crystalline and (ii) Amorphous. These allotropes of carbon having well defined crystal structures are : diamond, graphite and fullerenes. In diamond each carbon is tetrahedrally linked to four neighbouring carbon atoms through four strong bonds. This network extends in three dimension and is very rigid. In graphite each carbon is linked to three other carbon atoms forming hexagonal rings and form sheet like (layered) structure. The various sheets or layers are held together by weak Vander wall force of attraction.
In graphite, electrons are

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In graphite, electrons are

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The nature of chemical bond in diamond is:

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4HNO3 + C Error converting from MathML to accessible text. CO2 + 2H2O + NO2
Which of the following statements is true for the above reaction?

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Coal is an impure form of carbon in which percentage of carbon varies from _____ to _____

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The mass of the electron is:

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What is the ratio of mass of an electron to the mass of a proton?

What is the ratio of mass of an electron to the mass of a proton?

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In Rutherford’s atomic model, the electrostatic force of attraction between the positively and negatively charged particles is counter balanced by

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Two coils have a mutual inductance 0.005 H The current changes in the first coil According to equation I =I0 sin omega t where I0 = 10A and omega = 100 pi radian / second The maximum value of e.m. fin the second coil is

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