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2451.

Consider the reactions CO_((g))+H_(2)O_((g)to).^(larr)CO_(2)(g)+H_(2(g)) to K_(1) (ii) CH_(4(g))+H_(2)O_((g)to).^(larr)CO_((g))+3H_(2(g)) - K_(2) (iii) CO_(4(g))+2H_(2)O_((g)to).^(larr)CO_(2(g)) to K_(3) Give the relation between K_(1), K_(2) " and " K_(3). [K_(1), K_(2) " and " K_(3) are the equilibrium constants of the respective reactions.

Answer»

SOLUTION :(i) calculation of equilibrium constants for respective REACTIONS
(II) relation between `K_(1), K_(2) " and " K_(3)` from the calculated `K_(1), K_(2) " and " K_(3)`.
Discussion
2452.

Consider the reaction NO+(1)/(2)O_(2) hArr NO_(2). Which of the following gives the value of K_(c ) for this equilibrium ?

Answer»

`K_(C )=([NO][O_(2)]^(1//2))/([NO][O_(2)])`
`K_(c )=([NO_(2)])/([NO][O_(2)])`
`K_(c )=([NO_(2)])/([NO][O_(2)]^(1//2))`
`K_(c )=([NO_(2)])/([NO]^(2)[O_(2)])`

ANSWER :C
Discussion
2453.

_________ is the method used to separate cream from milk.

Answer»


ANSWER :CENTRIFUGATION
Discussion
2454.

Consider the isotopes of carbon i.e c-12 c-13 ,c-14 would you place them in same or different slots in the periodiodic table ? Give reason

Answer»

Solution :They should be placed in the same SLOT i.e they belong to IV A or 14 GROUP and 2nd period as they have same atomic NUMBER
Discussion
2455.

_________ is essential to perform separation by solvent extraction method

Answer»

SEPARATING FUNNEL
Centrifuge MACHINE
Filter paper
Sieves

ANSWER :A
Discussion
2456.

Conducts electricity in molten state and when in solutions. This statement is applicable to what type of compounds?

Answer»


ANSWER : IONIC COMPOUNDS
Discussion
2457.

________ is dispersing medium of Foam.

Answer»


ANSWER :LIQUID
Discussion
2458.

Condensation of water vapour in the air leads to the formation of ice.

Answer»


ANSWER :F
Discussion
2459.

……………. Is an electrochemical cell which converts electrical energy into chemical change (Reaction).

Answer»


ANSWER :ELECTROLYTIC CELL
Discussion
2460.

Compounds with same molecular formula and different structural formula are known as __________

Answer»


ANSWER :ISOMER
Discussion
2461.

______ is a compound.

Answer»


ANSWER :CARBON DIOXIDE
Discussion
2462.

............compounds have high melting and boiling points (a) Covalent (b) Coordinate (c) lonic

Answer»


ANSWER :C
Discussion
2463.

______ is a colloid, in wichh both phase are liquids

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ANSWER :EMULSION
Discussion
2464.

Compound X can be prepared by passing a gas Y I through a metal tube which is at very high temperature.Y on treatment with 2 g of hydrogen gas in presence of nickel gives a compound Z. Z can also : be prepared by treating ethyl alcohol with 'ic' acid of sulphur at 170^@ C. Y can also be prepared by hydrolysis of 'A' .Identify X,Y,Z and A and A and write all the balanced chemical equations.

Answer»

Solution :(i) identification of Z
(II)identiflcation of Y from Z
(iii) identiflcation of X from GIVEN REACTION of Y
(IV) identification of A from Y
Discussion
2465.

………… is a chemical used in finger print analysis.

Answer»


ANSWER :NINHYDRIN
Discussion
2466.

Compound and Mixture

Answer»

SOLUTION :
Discussion
2467.

Composition of the nuclei of two atomic species X and Y are given as under : X Y Protons = 66 Neutrons= 68 Give the mass numbers of X and Y. What is the relation between the two species ?

Answer»

SOLUTION :Mass number = number of protons + neutrons
Mass number of X = 6+6 = 12
Mass number of Y = 6 + 8 = 14
The atomic number of both X and Y is the same, 1.e., 6.
`therefore` X and Y are the ISOTOPES of the same ELEMENT.
Discussion
2468.

_____ has the same properties throughout the sample

Answer»

Pure SUBSTANCE
MIXTURE
COLLOID
SUSPENSION

Answer :A
Discussion
2469.

Composition of the nuclei of two atomic species X and Y are given as under{:(,X,Y),("Protons "=,6,6),("Neutrons "=,6,8):}Given the mass number of X and Y. What is the relation between the species ?

Answer»

SOLUTION :Mass number of X = Number of PROTONS + Number of NEUTRONS
`=6+6`
= 12
Mass number of Y = Number of Protons + Number of
Neutrons. `= 6+8=14`
These two ATOMIC species X and have same atomic number but different mass number. Hence they are ISOTOPES.
Discussion
2470.

......... gave the laws of chemical combination.

Answer»

SOLUTION :LAVOISIER
Discussion
2471.

Components retain their fundamental properties in the ______ .

Answer»


ANSWER :MIXTURE
Discussion
2472.

______ gas forms the liquid first as the air is cooled.

Answer»


ANSWER :NITROGEN
Discussion
2473.

Complete the table on the basis of the following information :""_(6)^(12)C, ""_(35)^(81)Br

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SOLUTION :
Discussion
2474.

______ elements are available in the nature.

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ANSWER :92
Discussion
2475.

Complete the table given below.

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SOLUTION :
Discussion
2476.

________ cannot be compressed as there is little space between particles.

Answer»


ANSWER :SOLIDS
Discussion
2477.

Complete the following table: {:("S.NO.","CELSIUS","KELVIN"),(1,90^(@)C,363K),(2,?,283K),(3,63^(@)C,?),(4,250^(@)C,?),(5,?,303K):}

Answer»

SOLUTION :
Discussion
2478.

_________ around exist in three physical states solid liquid and gas

Answer»


ANSWER :MATTER
Discussion
2479.

Complete the following table:

Answer»

SOLUTION :
Discussion
2480.

________ and ________ are the two elements that are liquid at room temperature.

Answer»


ANSWER :MERCURY and BROMINE
Discussion
2481.

Complete the following table

Answer»

SOLUTION :
Discussion
2482.

…………………, ………………and ……………..are macronutrients required for plant growth.

Answer»


ANSWER :NITROGEN, PHOSPHOROUS, POTASSIUM
Discussion
2483.

Complete the following equations and state whether they are oxidation or reduction reaction. O^(2-)-2e^(-)to _______.

Answer»

SOLUTION :`O^(2-)-2E^(-)toO`. (OXIDATION)
Discussion
2484.

{:("""A","""B"),("1. Kerosene from water","a. Chemical change"),("2. Iron pins from sand","b. Centrigugation"),("3. Butter from curd","c. Physical change"),("4. Digestion of food separation","d. Magnetic"),("5. Freezing of water","e. Decantation"):}

Answer»


Answer :1 - E, 2 - d, 3 - B, 4 - a, 5 - C
Discussion
2485.

Complete the following equations and state whether they are oxidation or reduction reaction. Na^(+)+____toNa

Answer»

SOLUTION :`NA^(+)+etoNa`. (REDUCTION)
Discussion
2486.

Complete the following equations and state whether they are oxidation or reduction reaction. Cu - _____ toCu^(2+)

Answer»

SOLUTION :`Cu-2e^(-)TOCU^(2+)`. (OXIDATION)
Discussion
2487.

Complete the following equations and state whether they are oxidation or reduction reaction. Fe^(2+)to____+e^(-)

Answer»

Solution :`Fe^(2+)TOFE^(3+)+E^(-)`. (Oxidation)
Discussion
2488.

Complete Table 2.3 by examining the arrangement of electrons before and after the chemical reaction during the formation of sodium chloride. Which atom accepts electron? How many electrons? .

Answer»


ANSWER :CHLORINE, ONE ELECTRON.
Discussion
2489.

Compare Thomson's atomic model with Ruterford's atomic model.

Answer»

SOLUTION :
Discussion
2490.

Compare the properties of electrons, protons and neutrons.

Answer»

SOLUTION :
Discussion
2491.

Compare the conductivity of a solution of NaOH in water and in alcohol.

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Solution :(i) COMPARISON of polar nature of water and alcohol
(II) TYPE of BONDS present in sodium hydroxide
(iii) relation between POLARITY and dielectric constant
(iv) effect of dielectric constant on solubility
(v) comparison of dielectric constants of water and alcohol
Discussion
2492.

Compare the charge and mass of protos and electrons .

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Solution :`{:(,"MASS","Charge"),("PROTON",1.672x10^(-24)g,"Positive"),("Electron",9.108x10^(-28)g,"NEGATIVE"):}`
Discussion
2493.

Compare solids and gases on the basis of (i) rigidity (ii) compressibility and (iii) movement of particles.

Answer»

SOLUTION :
Discussion
2494.

Compare metals and non-metals based on the following properties (i) Electrical conductivity (ii) Tensile strength (c) Formation of ions (iv) Reaction with acids

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SOLUTION :
Discussion
2495.

Compare cast iron, steel and wrought iron.

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SOLUTION :N/A
Discussion
2496.

Compare boiling and evaporation.

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SOLUTION :
Discussion
2497.

Compare all the proposed models of an atom given in this chapter.

Answer»

SOLUTION :
Discussion
2498.

Compare all the proposed model of an atom given in this chapter.

Answer»

SOLUTION :
Discussion
2499.

Compare all proposed models of an atom given in this chapter

Answer»

SOLUTION :
Discussion
2500.

Common salt (Table salt) dissolves in water.

Answer»

SOLUTION :Matter is made up of minute particles. Minute particles of matter have space between them. So when COMMON SALT is ADDED towater, thepaticles of salt get into the space between particles of water. HENCE, common salt (Table salt) dissolves in water.
Discussion