Chemistry-
General
Easy
Question
All ores are minerals while all minerals are not ores because:
- the metal cannot be extracted economically from all the minerals
- minerals are complex compounds
- the minerals are obtained from mines
- all statements are correct
The correct answer is: the metal cannot be extracted economically from all the minerals
Related Questions to study
Chemistry-
Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?
i)Ag
ii)Cu
iii)Na
iv)Al.
Metals are refined by using different methods. Which of the following metals are refined by electrolytic refining?
i)Ag
ii)Cu
iii)Na
iv)Al.
Chemistry-General
Chemistry-
Galvanization is a method of protecting iron from rusting by coating with a thin layer of
Galvanization is a method of protecting iron from rusting by coating with a thin layer of
Chemistry-General
Chemistry-
Corrosion or rusting can be prevented by
Corrosion or rusting can be prevented by
Chemistry-General
Chemistry-
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be:
An element reacts with oxygen to give a compound with a high melting point. This compound is also soluble in water. The element is likely to be:
Chemistry-General
Chemistry-
Which of the following metals is protected by a layer of its own oxide?
Which of the following metals is protected by a layer of its own oxide?
Chemistry-General
Chemistry-
The correct decreasing order of the metals in the activity series is:
The correct decreasing order of the metals in the activity series is:
Chemistry-General
Chemistry-
The order of reactivity with oxygen is in the order
The order of reactivity with oxygen is in the order
Chemistry-General
Chemistry-
H2SO4 acts as dehydrating agent in its reaction with
H2SO4 acts as dehydrating agent in its reaction with
Chemistry-General
Chemistry-
When an aluminium strip is kept immersed in freshly prepared ferrous sulphate solution taken in a test tube, the change observed is that
When an aluminium strip is kept immersed in freshly prepared ferrous sulphate solution taken in a test tube, the change observed is that
Chemistry-General
Chemistry-
A student puts one big iron nail in four test tubes containing solutions of zinc sulphate, aluminium sulphate, copper sulphate and iron sulphate. A reddish brown coating was observed only on the surface of iron nail which was put in the solution of:
A student puts one big iron nail in four test tubes containing solutions of zinc sulphate, aluminium sulphate, copper sulphate and iron sulphate. A reddish brown coating was observed only on the surface of iron nail which was put in the solution of:
Chemistry-General
Chemistry-
The correct order of decreasing reactivity of Zn, Cu, Fe and Al is:
The correct order of decreasing reactivity of Zn, Cu, Fe and Al is:
Chemistry-General
Chemistry-
Generally non-metals are not lustrous. Which of the following non-metal is lustrous?
Generally non-metals are not lustrous. Which of the following non-metal is lustrous?
Chemistry-General
Chemistry-
Statement–1: 
. If more Cl2 is added the equilibrium constant will decrease.
Statement–1 : Addition of inert gas to the equilibrium mixture at constant volume does not alter the equilibrium.
Statement–1: . If more Cl2 is added the equilibrium constant will decrease.
Statement–1 : Addition of inert gas to the equilibrium mixture at constant volume does not alter the equilibrium.
Chemistry-General
Chemistry-
Statement–1: For 
the equilibrium constant is ‘K’ then for 
the equilibrium constant will be 
Statement–2 : If concentration are changed to half the equilibrium constant will be halved.
Statement–1: For the equilibrium constant is ‘K’ then for the equilibrium constant will be
Statement–2 : If concentration are changed to half the equilibrium constant will be halved.
Chemistry-General
Chemistry-
If the composition of the system does not change with time, the system is said to be in chemical equilibrium. It is the state in which net reaction of a system is zero. In another words we can say that in reversible reactions, a stage is reached when the rate of transformation of reactants into products equals to the rate of transformation of products into reactants. At this stage, the composition of reactants and products does not change with time. This does not mean that the reaction has ceased, as both reverse and forward reactions are still taking place but with equal rate. Such equilibria are called dynamic equilirbria.
Let us consider a reaction of the type
A (g) + B(g) 
C(g) + D(g)
where Kc is equilibrium constant which is equal to the ratio of the concentrations of the product to reactants
where KP is the equilibrium constant which is equal to the ratio of partial pressure of products to reactants. The relation between KP and KC is as follows.
KP = Kc(RT)Dn
20.For the reaction
NH2COONH4(s) 2 NH3(g) + CO2(g)
The equilibrium constant KP = 2.9 × 10-5 atm3. The total pressure of gases at equilibrium when mole of reactant was heated will be
If the composition of the system does not change with time, the system is said to be in chemical equilibrium. It is the state in which net reaction of a system is zero. In another words we can say that in reversible reactions, a stage is reached when the rate of transformation of reactants into products equals to the rate of transformation of products into reactants. At this stage, the composition of reactants and products does not change with time. This does not mean that the reaction has ceased, as both reverse and forward reactions are still taking place but with equal rate. Such equilibria are called dynamic equilirbria.
Let us consider a reaction of the type
A (g) + B(g) C(g) + D(g)
where Kc is equilibrium constant which is equal to the ratio of the concentrations of the product to reactants
where KP is the equilibrium constant which is equal to the ratio of partial pressure of products to reactants. The relation between KP and KC is as follows.
KP = Kc(RT)Dn
20.For the reaction
NH2COONH4(s) 2 NH3(g) + CO2(g)
The equilibrium constant KP = 2.9 × 10-5 atm3. The total pressure of gases at equilibrium when mole of reactant was heated will be
Chemistry-General
