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24501.

The ratio of 'd' values in NaCl crystal is

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`0.707 : 1 : 1.154`
`1:0.707 : 1.154`
`1 : 1.154 : 0.707` 
`0.707 : 1.154 : 1`

ANSWER :B
24502.

The ratio of Cu and Sn metals in bronze

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Solution :In Brounze CU is 88% and Sn is 12% APPROXIMATLEY therefore the RATIO of Cu and Sn `(88xx63.5)/(12xx1.58)=3`
24503.

The ratio of CN and OS of x in [x(NH_(3))_(5)SO_(4)]Cl is

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Solution :In EDTA, two N ATOMS and FOUR O atoms are the donor atoms.
24504.

The ratio of cis and trans-isomers of the complex [Ma_(2)bcde]^(n+-) is:

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`5:3`
`2:1`
`7:3`
`3:1`

SOLUTION :
No. off cis-isomers=6
They are:

No. off trans-isomers=3
24505.

The ratio of closed packed atoms to tetrahedral holes in cubic close packing is:

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`1:1`
`1:2`
`1:3`
`2:1`

ANSWER :B
24506.

The ratio of close packed atoms to tetahedral hole in cubic packing is ………….

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`1:1`
`1:2`
`2:1`
`1:4`

Solution :Hint : If number of CLOSE packed = N , then,
The number of TETRAHEDRAL holes formed = 2N
Number of OCTAHEDRAL holes formed = N. THEREFORE `N:2N=1:2`
24507.

The ratio of cations to anion in a octahedral close packing is :

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0.414
0.225
0.02
None

Answer :A
24508.

The ratio of cations to anion in a closed pack tetrahedral is-

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0.414
0.225
0.02
None

Answer :B
24509.

The ratio of cations to anion in a closed pack tetrahedral is :

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1
0.225
0.02
None

Answer :B
24510.

The ratio of cationic radius to anionic radius in an ionic crystal is greater than 0.732. its coordination number is

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6
8
1
4

Solution :If RADIUS RATIO `((r_(c)^(+))/(r_(a)^(-)))` is more than 0.732 its permitted coordination NUMBER is 8.
24511.

The ratio of C^(14)//C^(12) in dead tissue is less than that in fresh tissue.

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ANSWER :T
24512.

The ratio of carbon, hydrogen and oxygen in 2- methyl benzoic acid is:

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(4:4:2)
(4:4:1)
(4:2:2)
(2:4:1)

ANSWER :B
24513.

The ratio of Boyle's temperature and critical temperature for a gas is :

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8/27
27/8
1/2
2/1

Answer :B
24514.

The ratio of average speed of an oxygen molecular to the r.m.s. speed of a N_(2) molecular at the same temperature is :

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`((3PI )/( 7) )^(1//2)`
`(( 7)/( 3pi ))^(1//2)`
`((3)/( 7pi ))^(1//2)`
`((7pi)/( 3))^(1//2)`

Solution :`u_(av)` of `O_(2) = sqrt((8RT)/( M)) = sqrt(( 8 RT)/( pi xx 32))`
`u_("rms") ` or `N_(2) = sqrt(( 3RT)/( M)) = sqrt(( 3RT)/( 28))`
`( u_(av))/( u_("rms")) = sqrt((8RT)/(pi xx 32))xxsqrt((28)/( 3RT)) = (7^(1/2))/( 3pi)`
24515.

The ratio of average speed and most probable speed is :

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`2 // SQRT( pi)`
` sqrt( 8 RT ) // (pi M )`
`sqrt( 8 // 3PI )`
` pi // sqrt( 2)`

ANSWER :A
24516.

The ratio of area covered by second orbit to the first orbit in hydrogen atom is :-

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0.043055555555556
0.052777777777778
0.33402777777778
0.66736111111111

Answer :D
24517.

The ratio of any colligative property for KCl solution to that of sugar solution of same molality is

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1
0.5
2
3

Answer :C
24518.

The ratio of activities of two radionuclides X and Y in a mixture at time t=0 was found to be 8:1 after two hour's the ratio of activities become 1:1. If the t_(1//2) of radionuclide X is 20 min find the t_(1//2)[in minutes] of radionuclide Y.

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ANSWER :40
24519.

Ratio of the amounts of H_(2)S needed to precipitate all the metal ions from 100 ml of 1M AgNO_(3) and 100 ml of 1M CuSO_(4) will be :

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`1:2`
`2:1`
zero
infinite

ANSWER :a
24520.

The ratio of amounts of H_(2)S needed to precipitate all the metal ions from 100 ml of 1 M AgNO_(3) and 100 ml of 1 M CuSO_(4) will be

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`1:2`
`2:1`
Zero
Infinity

Solution :In ACIDIC medium 2 MOLECULES of `KMnO_(4)` gives 5 ATOMS of OXYGEN
`2KMnO_(4)+3H_(2)SO_(4) to K_(2)SO_(4)+2MnSO_(4)+3H_(2)O+5(O)`
`2xx158=(316xx8)/(80)=31.6`
So, equivalent wt. of `KMnO_(4)` in acidic medium is `=31.6`gm
24521.

The ratio fo fraction of molecules present in the velocity range 450 m/sec to (450+0.01) m/sec for O_(2) at 100K and SO_(2) present at 200 K is :

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2
`(1)/(2)`
4
1

Solution :Since `(T)/(M)` RATIO for both `O_(2)` at 100K and `SO_(2)` at 200K is same, curve will be same for both `&` ratio=1.
24522.

The ratio gamma((C_(P))/(C_(V))) for iner gases is

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1.33
1.66
2.13
1.99

Solution :`gamma =(C_(p))/(C_(V))=(5)/(3) = 1.66` ( For MONOATOMIC asHe,Ne,AR)
24523.

The ratio C_p//C_vfor noble gases is

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1.67
1.33
1.42
1.84

Answer :A
24524.

The ratio between the root mean square velocity of H_(2) at 50K and that of O_(2) at 800K is

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4
2
1
`1//4`

SOLUTION :`m(H_(2)) = sqrt(( 3R xx 500)/( 2))`
`m ( O_(2)) = sqrt(( 3R xx 800)/( 32))`
`( mu ( H_(2)))/( mu ( O_(2))) = sqrt(( 3R xx 500)/( 2) ) xx sqrt( ( 32 ) /( 3R xx 800))`
`= sqrt(( 500 xx 32)/( 2 xx 800)) = 1 `
24525.

The ratio between the root mean square velocity of H_(2) at 50 K and that of O_(2) at 800 K is

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4
2
1
`1//4`

ANSWER :C
24526.

The ratio between the root mean square speed of H_2 at 50k and that of O_2 at 800k is :

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4
2
1
1/4

Answer :C
24527.

The ratio between the maximum tolerated dose of a drug and a minimum curative dose is called

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ISO electric point
THERAPEUTIC INDEX
critical point
iso thermal point

Solution :therapeutic index
24528.

The van der Walls' equation explains the behaviour of :

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ATM litre `mol^(-1)`
`atm dm^3 mol^(-1)`
DYNE CM `mol^(-1)`
all

Answer :D
24529.

The rates of reaction invrease with increase of temperature because

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activation ENERGY of the REACTION molecules decreases
kinetic eriergy of the product molecules increases
the fraction of the REACTING molecules possessing an· energy equal to the activation energy
the collisions between molecules decrease

SOLUTION :With increase in temperature, tehe factor `._eE_a//RT`which gives fraction of molecules with energy increases and hence `E_a` increases.
24530.

The rates of most the reactions double when the temperature is raised from 298 K to 308 K Calculate their activation energy.

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Solution :From ARRHENIUS EQUATION ,we know
`"LOG"K_1/K_2=E_a/(2.303R)[1/T_1-1/T_2]`
Here `K_2/K_1=2,T_1=298K,T_2=308K`.SUBSTITUTING the values,we get
`"log"2=E_a/(2.303xx8.314JK^-1mol_^-1)[(T_2-T_1)/(T_1T_2)]`
`E_a=`52897.7mol^-1=52.89kj` MOL.
24531.

The rates of effusion of two gases A and B under the same conditions of temperature and pressure are in the ratio gamma_A : gamma_B= 2: 1. What would be the ratio of the rms speeds of molecules of A and B if T_A : T_B = 2 : 1?

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SOLUTION :`2 SQRT2 : 1`
24532.

The rate of most reactions become double when their temperature is raised from 298 K to 308 K. Calculate their activation energy. (Given, R = 8.314" J mol"^(-1) )

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Solution :From Arrhenius EQUATION ,we KNOW
`"log"K_1/K_2=E_a/(2.303R)[1/T_1-1/T_2]`
Here `K_2/K_1=2,T_1=298K,T_2=308K`.Substituting the values,we get
`"log"2=E_a/(2.303xx8.314JK^-1mol_^-1)[(T_2-T_1)/(T_1T_2)]`
`E_a=`52897.7mol^-1=52.89kj` MOL.
24533.

The rates of diffusion ofSO_2 , CO_2 , PCl_3 ,SO_3 are in the following order :

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`PCl_3 GT SO_3 gt SO_2 gt CO_2`
`CO_2 gt SO_3 gt PCl_3 gt SO_3`
`SO_2 gt SO_3 gt PCl_3 gt CO_2`
`CO_2 gt SO_2 gt SO_3 gt PCl_3`

ANSWER :D
24534.

The rates of a reaction starting with intial conentrations of 2xx10^(-3) M and 1xx10^(-3) M are equal to 2.40xx10^(-4) M s^(-1) and 0.60xx10^(-4) M s^(-1) respectively. Calculate the order of the reaction with respect to the reactant and also the rate constant.

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Solution :If N is the order of reaction
RATE `=k[A_(0)]^(n)=kC^(n)`
For two different initialconcentrations, we have
`(r_(1))/(r_(2))=((C_(1))/(C_(2)))^(n):.log""(r_(1))/(r_(2))=nlog""(C_(1))/(C_(2))`
or `""n=(log(r_(1)//r_(2)))/(log(C_(1)//C_(2)))=(log(2.4xx10^(-4)//0.6xx10^(-4)))/(log(2xx10^(-3)//1xx10^(-3)))=(LOG4)/(log2)=2`
Hence, orderof reaction = 2
Rate `=k[A_(0)]^(2)`
`k=("Rate")/([A_(0)]^(2))=(2.4xx10^(-4)"mol L"^(-1)s^(-1))/((2xx10^(-3)"mol L"^(-1))^(2))=0.6xx10^(2)"L mil"^(-1)s^(-1)`
24535.

The rates of diffusion of O_2 and H_2 at same P and T are the ratio :

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1:4
1:8
1:16
4:1

Answer :A
24536.

The rate ofreaction at different times are as follows : [[time(sec),0,10,20,30],[rate(Msec^-),1.5xx10^-2,1.48xx10^-2,1.51xx10^-2,1.49xx10^-2]] The reaction is

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ZERO prder
1st order
2nd order
3rd order

Answer :A
24537.

The rate of the reation is expressed in different way as followed : -1/m . (d[A])/(dt)=+(1)/(n)(d[B])/(dt)=- (1)/(p)(d[C])/(dt)=+ 1/q (d[D])/(dt) The reaction is

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`na+mB rarr pC+qD`
`pA + qB rarr mC +n D `
`pA +mB rarr nC +qD`
`mA+pCrarr nB +qD `

Solution :A and C are reactants as their CONCENTRATION falls with time hence , (minus sign) .
B and D are the product of the reaction because their concentration increases with time hence (PLUS sign) .
'm' and 'p' are the STOICHIOMETRIC coefficients of A and C while 'n' and 'q' are the coefficients of products B and D .
So, the equation of the reaction BECOMES :
`mA + pC to n B + qD`.
24538.

The rate of the reaction x+2yrarr product is 4xx10^(-3) " mol L"^(-1)s^(-1) , if [x] = [y] =0.2 M and rate constant at 400K is 2xx10^(-2)s^(-1) , what is the overall order of the reaction.

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Solution :Rate `=K[x]^n[y]^m`
`4xx10^(-3)"mol"L^(-1)s^(-1)=2xx10^(-2)s^(-1)(0.2 "mol L"^(-1))^n(0.2 "mol L"^(-1))^m`
`(4xx10^(-3)"mol L"^(-1)s^(-1))/(2xx10^(-2)s^(-1))=(0.2)^(n+m)("mol L"^(-1))^(n+m)`
`2.0("mol L"^(-1))=(0.2)^(n+m)("mol L"^(-1))^(n+m)`
Comparing the powers on both sides , the overall order of the REACTION n + m = 1
24539.

The rate of the reaction X to Y becomes 8 times when the concentration of the reactant 'X' is doubled . The rate law of the reaction is ………..

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`- (d [X])/(dt) = k [X]^(2)`
`- (d [x])/(dt) = k[X]^3`
`- (d[x])/(dt) = k[X]^(4)`
`- (d[x])/(dt) = k[X]^(8)`

SOLUTION :`- (d[x])/(dt) = k[X]^(3)`
24540.

The rate of the reaction X rarrY becomes 8 times when the concentration of the reactant 'X' is doubled . The rate law of the reaction is ............

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`-(d[X])/(dt)=K[X]^2`
`-(d[x])/(dt)=k[X]^3`
`-(d[x])/(dt)=k[X]^4`
`-(d[x])/(dt)=k[X]^8`

ANSWER :B
24541.

The rate of the reaction A to products , at the intitial concentrations of 3.24 xx 10^(-2)M is nine times its rate at constant initial concentration of 1.2 xx 10^(-3)M . The order of the reaction is

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`(1)/(2)`
`(3)/(4)`
`(3)/(2)`
`(2)/(3)`

Solution :9r = `k (3.24 xx 10^(-2))^(ALPHA ) "" …. (i)`
`r = k(1.2 xx 10^(-3))^(alpha) "" …. (ii)`
DIVIDE EQ. (i) by (ii)
`(9r)/(r) = (k(3.24 xx 10^(-2))^(alpha))/(k (1.2 xx 10^(-3))^(alpha)) implies 3^(2) = 3^(3alpha)`
`THEREFORE alpha = (2)/(3)`.
24542.

The rate of the reaction A toProducts, at the initial concentration of 3.24xx10^(-2) M is nine times its rate at another initial concentration of 1.2xx10^(-3) M. The order of the reaction is

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`(1)/(2)`
`(3)/(4)`
`(3)/(2)`
`(2)/(3)`

SOLUTION :`9 r = K(3*24 xx 10^(-2))^(n)""…(i)`
`r = k(1* 2 xx 10^(-3))^(n)""…(ii)`
DIVIDING (i) by (ii),
` 9 = ((3.24 xx 10^(-2))/(1*2 xx 10^(-3)))^(n) or 9 = (27)^(n)`
or `(3)^(2) = (3^(3))^(n) = (3)^(3N).`
Hence, `3 n = 2 or n = 2//3`.
24543.

The rate of the reactionA + B to 3Cgets increased by 72 times when the concentration of A is tripled and that of B is doubled . The order of the reaction with respect to A and B are -- and --- respectively

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1,2
2,3
3,2
2,2

ANSWER :B
24544.

The rate of the reaction A rarr Products at the initial concentration of 3.24 xx10^(-2) M is nine times its rate at another initial concentration of 1.2xx10^(-3) M. The order of the reaction is

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`(1)/(2)`
`(3)/(4)`
`(2)/(3)`
`(3)/(2)`

Solution :( C) If rate at conc .` 1.2 xx10^(-2) ` M is r then
`r = k(1.2xx10^(-3))^(a)"" cdots(i) `
`9r= k(3.24xx10^(-2))^(a) "" cdots(II)`
DIVIDING eq (ii) by eq. (i)
`9=((3.24xx10^(2))^(a))/((1.2xx10^(-3))^(a))=27^(a)`
or` 3^(2)=3^(3A)`
`:. 3a=2 "or" a =2//3`
24545.

The rate of the reaction,A+B+Crarr products, is given byr=(-d[A])/(dt)=k[A]^(1//2)[B]^(1//3)[C]^(1//4). The order of the reaction is

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`1/3`
`1/4`
`1/2`
`13/12`

SOLUTION : ORDER of REACTION `=1/2+1/3+1/4=(6+4+3)/(12)=(13)/(12)`
24546.

The rate of the reaction 2N_(2)O_(5) to 4NO_(2)+O_(2) can be written in three ways (-d[N_(2)O_(5)])/(dt)=k[N_(2)O_(5)],(d[N_(2)O_(5)])/(dt)=k'[N_(2)O_(5)](d[O_(2)])/(dt)=k''[N_(2)O_(5)] The relationship between k and k' and between k and k'' are

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`K'=2K,k'=k`
`k'=2k,k"=k//2`
`k'=2k,k"=2k`
`k'=k,k"=k`

ANSWER :B
24547.

The rate of the reaction 2N_(2)O_(5) to 4 NO_(2) + O_(2) can be written in three ways (-d [N_(2)O_(5)])/(dt) = k [N_(2)O_(5)] (d [NO_(2)])/(dt) = k' [N_(2)O_(5)] (d[O_(2)])/(dt ) = k'' [N_(2)O_(5)] The relationship between k and k' and between k and k'' are

Answer»

k' = 2K , k''= 2k
k' = k , k''= k
k' = 2k , k''= k
k' = 2k , k''= k/2

Solution :`-(1)/(2) (d(N_(2)O_(5)))/(DT) = (1)/(4) (d(NO_(2)))/(dt) = (d(O_(2)))/(dt)`
`(1)/(2) k (N_(2)O_(5)) = (1)/(2) k' (N_(2)O_(5)) = k'' (N_(2)O_(5))`
`(k)/(2) = (k')/(4) = k'' implies k' = 2k , k'' = (k)/(2)`.
24548.

The rate of the reaction 2SO_(2) +O_(2) rarr 2SO_(3) may be expressed as : -(d[O_(2)])/(dt)= 2.5 xx10^(-4) "mol L"^(-1) "sec"^(-1) The rate of reaction when expressed in terms of SO_(3) will be :

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`-5.0xx10^(-4) "mol L"^(-1) "SEC"^(-1)`
`-1.25xx10^(-4) "mol L"^(-1) "sec"^(-1)`
`3.75xx10^(-4) "mol L"^(-1) "sec"^(-1) `
`5.0xx10^(-4) "mol L"^(4) "sec"^(-1)`

Solution :(D) Rate `= -(1)/(2) (d[SO_(2)])/(DT) =-(d[O_(2)])/(dt)`
`(d[SO_(2)])/(dt)=2 (d[O_(2)])/(dt)`
`=2xx2.5 xx10^(-4) `
`= 5.0 xx10^(-4)mol L^(-1) sec^(-I)`
24549.

The rate of the reaction 2 NO+Cl_(2)to2NOCl is given by the rate equation : rate =k[NO]^(2)[Cl_(2)]. Thevalue of the rate constant can be increased by

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increasing the temperature
increasing the concentration of NO
increasing the concentration of `Cl_(2)`
doing all of these

Solution :(a) : The rate CONSTANT of a reaction depends only on temperature and does not depend uponconcentrations of the REACTANTS.
24550.

The rate of the reaction 2 NO + Cl_(2) to 2 NOCl is given by the rate equation rate = k [NO]^(2) [Cl_(2)] The value of the rate constant can be increased by

Answer»

INCREASING the temperature
Increasing the CONCENTRATION of NO
Increasing the concentration of the `Cl_(2)`
Doing all of these

Solution :Concentration do not AFFECT rate CONSTANT