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Odd climatic changes that result in rise...

Odd climatic changes that result in rise in temperature of ocean waters leading to deleterious changes in the environment like increased melting of polar and Himalayan ice caps severely affecting Indian monsoon is

A

Green-house effect

B

El Nino effect

C

CO2, fertilization effect

D

Ocean pollution

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Choose the correct option w. r. t the statement given below. 'rise in temperature is leading to deleterious change in the environment and resulting in odd climates changes'

Le Chatelier's Principle If a system at equilibrium is subjected to a change of any one of the factors such as concentration, pressure or temperature, the system adjusts itself in such a way as to nullify the effect of that change. Change of pressure : If a system consists of gases, then the concentration of all the components can be alterd by changing the pressure. To increase the pressure on the system,the volume has to be decreased proportionally. The total number of mols per unit volume will now be more and the equilibrium will shift in the direction in which there is a decrease in number of moles i,e. towards the direction in which there can be decrease in pressure. Effect of pressure on melting point : There are two types of solids: (a) Solids whose volume decreases on melting e.g., ice,diamond carborundum magnesium nitride and quratz. Solids (higher volume) hArr Liquid (lower volume) The process of melting is facilitated at high pressure, thus, melting point is lowerd. (b) Solids whose volume increase on melting e.g.,Fe,Cu,Ag,Au,etc. Solid (lower volume) hArr Liquid (higher volume) In this case the process of melting become difficult at high pressure, thus melting point becomes high. (c) Solubility of substances : When solid substances are dissolved in water, either heat is evolved (exothermic) or heat is absorbed (endothermic). KCI+aqhArrKCI(aq)-heat In such cases, solubility increase with increase in temperature. Consider the case of KOH, when this is dissolved,heat is evolved. KOH+aqhArrKOH(aq)+heat In such cases, solubility decrease with increase in temperature. (d) Solubility of gases in liquids : When a gas dissolves in liquid,there is decrease in volume. Thus increase of pressure will favour the dissolution of gas in liquid. A gas 'X' when dissolved in water,heat is evolved. Then solubility of 'X' will increase:

Le Chatelier's Principle If a system at equilibrium is subjected to a change of any one of the factors such as concentration, pressure or temperature, the system adjusts itself in such a way as to nullify the effect of that change. Change of pressure : If a system consists of gases, then the concentration of all the components can be alterd by changing the pressure. To increase the pressure on the system,the volume has to be decreased proportionally. The total number of mols per unit volume will now be more and the equilibrium will shift in the direction in which there is a decrease in number of moles i,e. towards the direction in which there can be decrease in pressure. Effect of pressure on melting point : There are two types of solids: (a) Solids whose volume decreases on melting e.g., ice,diamond carborundum magnesium nitride and quratz. Solids (higher volume) hArr Liquid (lower volume) The process of melting is facilitated at high pressure, thus, melting point is lowerd. (b) Solids whose volume increase on melting e.g.,Fe,Cu,Ag,Au,etc. Solid (lower volume) hArr Liquid (higher volume) In this case the process of melting become difficult at high pressure, thus melting point becomes high. (c) Solubility of substances : When solid substances are dissolved in water, either heat is evolved (exothermic) or heat is absorbed (endothermic). KCI+aqhArrKCI(aq)-heat In such cases, solubility increase with increase in temperature. Consider the case of KOH, when this is dissolved,heat is evolved. KOH+aqhArrKOH(aq)+heat In such cases, solubility decrease with increase in temperature. (d) Solubility of gases in liquids : When a gas dissolves in liquid,there is decrease in volume. Thus increase of pressure will favour the dissolution of gas in liquid. Au(s) hArr Au(l) Above equsilibrium is favoured at :

An ice ball of radius a and mass m is placed at 0^@C inside a thick hollow sphere of inner and outer radii a and b whose thermal conductivity varies as k=alpha/r^2 , where alpha is a positive constant and r is the distance from centre. The temperature of surrounding is theta_0 and latent heat of fusion for ice is L_f . Then , time required to completely melt the ice ball is (Neglect the contraction in volume when ice melts into water and any change in thermal resistance due to melting of ice of the system.)

Consider the following statements : (I)An increase in pressure (caused by decrease in volume) at equilibrium results in increase in molar concentration of each gasous substances involved. (II)An increase in pressure (caused by decrease in volume) at equilibrium results in increase in no. of moles of each gaseous substance involved. (III)For the reaction A(s)hArr B(g)+C(g) at constant temperature, total pressure at equilibrium (of B(g) & C(g)) is not affected by changing the volume of container. (IV) H_2O(l)hArrH_2O(g) on temperature increase K of this reaction is increased. Tick the correct statement(s)

State true/false: S_1 : Hydrostatic pressure is a scalar quantity even though pressure is force divided by area and force is a vector quantity? S_2 : A barometer made of a very narrow tube (see figure) is placed at normal temperature and pressure. The coefficient of volume expansion of mercury is 0.00018//.^@C and that of the tube is negligible. The temperature of mercury in the barometer is now raised by 1^@C but the temperature of the atmosphere does not change. Then, the mercury height in the tube remains unchanged. S_3 A block of ice with a lead shot embedded in it is floating on water contained in a vessel. The temperature of the system is maintained at 0^@C as the ice melts. When the ice melts completely the level of water in the vessel rises.

The measure of net molecular polarity is a quantity called dipole moment which is defined as the magnitude of the charge Q at either end of the molecular dipole times the distance 'r' between the charge : mu=Qxxr Molecular polarities give rise to some of the forces that occur between molecules.Such forces are termed as intermolecular forces.These molecular forces are of several different types including dipole-dipole forces, London dispersion forces, hydrogen bonds and ion-dipole forces (operate between ions and molecules).These intermolecular forces are electrical in origin and results from the mutual attraction of unlike charges or the mutual repulsion of like charges. A formal positive charge on the central atom affect the size of orbitals.A formal positive charge on central atom will pull in all electrons towards the nucleus and this will leads to the contraction in size of orbitals. Select the correct statement.

The measure of net molecular polarity is a quantity called dipole moment which is defined as the magnitude of the charge Q at either end of the molecular dipole times the distance 'r' between the charge : mu=Qxxr Molecular polarities give rise to some of the forces that occur between molecules.Such forces are termed as intermolecular forces.These molecular forces are of several different types including dipole-dipole forces, London dispersion forces, hydrogen bonds and ion-dipole forces (operate between ions and molecules).These intermolecular forces are electrical in origin and results from the mutual attraction of unlike charges or the mutual repulsion of like charges. A formal positive charge on the central atom affect the size of orbitals.A formal positive charge on central atom will pull in all electrons towards the nucleus and this will leads to the contraction in size of orbitals. Which of the following molecule does not have dipole moment ?

AAKASH INSTITUTE ENGLISH-Test-12-Exercise
  1. Consider the following statements. a. NPP is the available blomass for...

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  2. High diversity shown by a single species at the genetic level over its...

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  3. Odd climatic changes that result in rise in temperature of ocean water...

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  4. Similarities between annelids and arthropods, include all, except

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  5. A stable population exists in Hardy Weinberg equilibrium with two alle...

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  6. pigment is present in green plants.

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  7. Haemoglobin in capillaries of the lungs is exposed to an oxygen pressu...

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  8. Expand. TB.

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  9. A person takes a large overdose of antacid. As a result, the activity ...

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  10. Which of the following association of brain structure and function is ...

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  11. To ensure survival of their species, animals which do not spend a larg...

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  12. Which of the following is in a different chemical category than the ot...

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  13. Find the incorrect match.

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  14. A mechanism that mammals have developed to dissipate excess heat in ho...

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  15. Which of the following represents earliest set of haploid structures t...

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  16. Decline in which hormone leads to regression of corpus luteum in non-p...

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  17. Choose the Incorrect statement regarding Syphilis.

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  18. British doctors Patrick Steptoe and Robert Edwards have been credited ...

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  19. Properties exhibited by normal cells include

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  20. Symptoms of allergy can be alleviated by administration of all, except

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