Chemistry-
General
Easy
Question
Which of the following is/are hard water(s)
- Water containing some potash alum
- Water containing a few drops of HCl
- Water containing common salt
- Water containing calcium nitrate
The correct answer is: Water containing calcium nitrate
Water containing any cation other than 
and alkali metal is a hard water
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When zeolite, which is hydrated sodium aluminium silicate, is treated with hard water the sodium ions are exchanged with
When zeolite, which is hydrated sodium aluminium silicate, is treated with hard water the sodium ions are exchanged with
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The velocity with which a projectile must be fired so that it escapes earth's gravitational does not depend on ……
The velocity with which a projectile must be fired so that it escapes earth's gravitational does not depend on ……
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The structure of 
is
The structure of is
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Escape velocity on the surface of earth is 11.2kms-1 Escape velocity from a planet whose masses the same as that of earth and radius 1/4 that of earth is.....kms-1
Escape velocity on the surface of earth is 11.2kms-1 Escape velocity from a planet whose masses the same as that of earth and radius 1/4 that of earth is.....kms-1
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Correct configuration of the following molecule is : 
,
Correct configuration of the following molecule is : ,
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3 Particle each of mass are kept at vertices of an equilateral triangle of side L. The gravitatioml field at center due to these particles is……
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Given mass of the moon is 
of the mass of the earth and corresponding radius is 
of the earth, If escape velocity on the earth surface is 11.2kms-1 the value of same on the surface of moon is.....kms-1
Given mass of the moon is of the mass of the earth and corresponding radius is of the earth, If escape velocity on the earth surface is 11.2kms-1 the value of same on the surface of moon is.....kms-1
physicsGeneral
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The escape velocity of a body on the surface of the earth is 11.2km/sec. If the mass of the earth is increases to twice its present value and the radius of the earth becomes half, the escape velocity becomes...kms-1
The escape velocity of a body on the surface of the earth is 11.2km/sec. If the mass of the earth is increases to twice its present value and the radius of the earth becomes half, the escape velocity becomes...kms-1
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There are two planets, the ratio of radius of two planets is k but the acceleration due to gravity of both planets are g what will be the ratio of their escape velocity.
There are two planets, the ratio of radius of two planets is k but the acceleration due to gravity of both planets are g what will be the ratio of their escape velocity.
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The escape velocity of a planet having mass 6 times and radius 2 times as that of earth is.........
The escape velocity of a planet having mass 6 times and radius 2 times as that of earth is.........
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chemistry-
Correct statements from the graph
I) Above 1073K, 
for the formation of Fe2O3 is less negative than for the formation of CO from carbon
II) Above 1073K, Carbon can reduce Fe2O3
III) Below 1073K, CO can reduce Fe2O3
IV) In blast furnace, reduction of Fe2O3 occurs in different temperature ranges with below 1073K by CO (or) above 1073K by carbon
Correct statements from the graph
I) Above 1073K, for the formation of Fe2O3 is less negative than for the formation of CO from carbon
II) Above 1073K, Carbon can reduce Fe2O3
III) Below 1073K, CO can reduce Fe2O3
IV) In blast furnace, reduction of Fe2O3 occurs in different temperature ranges with below 1073K by CO (or) above 1073K by carbon
chemistry-General
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Correct statement(s) regarding the graph
Correct statement(s) regarding the graph
chemistry-General
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From the graph, which is the best reducing agent to reduce Cu2 O at high temperature
From the graph, which is the best reducing agent to reduce Cu2 O at high temperature
chemistry-General
