Chemistry-
General
Easy
Question
From the graph, which is the best reducing agent to reduce Cu2 O at high temperature
- Coke
- CO
- CO2
- 1 & 2
The correct answer is: Coke
Related Questions to study
chemistry-
Correct statement(s) regarding the graph
I) Above 983K, Carbon can reduce any metal oxide at high temperature and itself oxidised to CO
II) In the first reaction (Formation of CO2 from ‘C’) 
=0 & 
remains nearly same, i.e it is independent of temperature
III) In the second reaction, (formation of CO) , there is increase in entropy & =+ve&
becomes more –ve with increase in temperature
IV) In third reaction (formation of CO2 from CO), there is a decrease in entropy =-ve & becomes less –ve with increase in temperature
Correct statement(s) regarding the graph
I) Above 983K, Carbon can reduce any metal oxide at high temperature and itself oxidised to CO
II) In the first reaction (Formation of CO2 from ‘C’) =0 & remains nearly same, i.e it is independent of temperature
III) In the second reaction, (formation of CO) , there is increase in entropy & =+ve& becomes more –ve with increase in temperature
IV) In third reaction (formation of CO2 from CO), there is a decrease in entropy =-ve & becomes less –ve with increase in temperature
chemistry-General
chemistry-
Ellingham diagram is given below for the formation of some oxides. Then select the correct combination
Ellingham diagram is given below for the formation of some oxides. Then select the correct combination
chemistry-General
chemistry-
From Ellingham diagram the correct statements
a) 
b) 
c) 
From Ellingham diagram the correct statements
a)
b)
c)
chemistry-General
physics
An artificial satellite is revolving round the earth in a circular orbit its velocity is half the escape velocity. Its height from the earth surface is .=...km
An artificial satellite is revolving round the earth in a circular orbit its velocity is half the escape velocity. Its height from the earth surface is .=...km
physicsGeneral
physics
The escape velocity of a body from earth's surface is Vee. The escape velocity of the same body from a height equal to from earth's surface will be
The escape velocity of a body from earth's surface is Vee. The escape velocity of the same body from a height equal to from earth's surface will be
physicsGeneral
physics
Two small and heavy sphere, each of mass M, are placed distance r apart on a horizontal surface the gravitational potential at a mid point on the line joining the center of spheres is
Two small and heavy sphere, each of mass M, are placed distance r apart on a horizontal surface the gravitational potential at a mid point on the line joining the center of spheres is
physicsGeneral
physics
The escape velocity of an object from the earth depends upon the mass of earth (M), its mean density ( 
), its radius (R) and gravitational constant (G), thus the formula for escape veloctiy is
The escape velocity of an object from the earth depends upon the mass of earth (M), its mean density ( ), its radius (R) and gravitational constant (G), thus the formula for escape veloctiy is
physicsGeneral
physics
The escape velocity of a particle of mass m varies as
The escape velocity of a particle of mass m varies as
physicsGeneral
physics
The escape velocity of a projectile from the earth is approximately
The escape velocity of a projectile from the earth is approximately
physicsGeneral
physics
If g is the acceleration due to gravity at the earth's surface and r is the radius of the earth, the escape velocity for the body to escape out of earth's gravitational field is……..
If g is the acceleration due to gravity at the earth's surface and r is the radius of the earth, the escape velocity for the body to escape out of earth's gravitational field is……..
physicsGeneral
physics
The escape velocity from the earth is about 11kms-1. The escape velocity from a planet having twice the radius and the same mean density as the earth is ... kms -1
The escape velocity from the earth is about 11kms-1. The escape velocity from a planet having twice the radius and the same mean density as the earth is ... kms -1
physicsGeneral
chemistry-
When zeolite (Hydrated sodium aluminium silicate) is treated with hard water the sodium ions are exchanged with
When zeolite (Hydrated sodium aluminium silicate) is treated with hard water the sodium ions are exchanged with
chemistry-General
chemistry-
Temporary hardness of water can be removed by
Temporary hardness of water can be removed by
chemistry-General
chemistry-
Which of the following pair of ions makes the water hard
Which of the following pair of ions makes the water hard
chemistry-General
chemistry-
Heavy water is compound of
Heavy water is compound of
chemistry-General
