Chemistry-
General
Easy

Question

The packing efficiency of the two-dimensional square unit cell shown below is:

  1. 39.27%    
  2. 68.02%    
  3. 74.05%    
  4. 78.54%    

The correct answer is: 78.54%

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For measuring depth of a beaker using verniercallipers observed readings are given as  If zero error is - 0.03cm, then mean corrected depth is

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The n th division of main scale coincides with left parenthesis n plus 1 right parenthesis to the power of t h end exponent division of vernierscale Given+n one main scale division is equal to  'a' units The least count of vernier is

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The nuclear charge (Ze) is non-uniformly distributed within a nucleus of radius R The (charge per unit volume) rho left parenthesis r right parenthesischarge density is dependent only on the radial distance r from the centre of the nucleus, as shown The electric field is only along radial direction
For a = 0, the value of d(maximum value of rho as shown in the figure) is :

The nuclear charge (Ze) is non-uniformly distributed within a nucleus of radius R The (charge per unit volume) rho left parenthesis r right parenthesischarge density is dependent only on the radial distance r from the centre of the nucleus, as shown The electric field is only along radial direction
For a = 0, the value of d(maximum value of rho as shown in the figure) is :

physics-General
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The nuclear charge (Ze) is non-uniformly distributed within a nucleus of radius R The (charge per unit volume) rho left parenthesis r right parenthesischarge density is dependent only on the radial distance r from the centre of the nucleus, as shown The electric field is only along radial direction

The electric field at r = R is :

The nuclear charge (Ze) is non-uniformly distributed within a nucleus of radius R The (charge per unit volume) rho left parenthesis r right parenthesischarge density is dependent only on the radial distance r from the centre of the nucleus, as shown The electric field is only along radial direction

The electric field at r = R is :

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Consider radioactive decay of A to B which , further decays either to X or Y, andlambda subscript 1 end subscript comma lambda subscript 2 end subscript comma lambda subscript 3 end subscript are decay constants for A to B decay, B to X decay and B to Y decay respectively At t =0, the number of nuclei of A,B,X and Y are N subscript 0 end subscript , N subscript 0 end subscript zero and zero respectively N subscript 1 end subscript comma N subscript 2 end subscript comma N subscript 3 end subscript text  and  end text N subscript 4 end subscript are the number of nuclei of A,B,X and Y are at any instant t.

At t equals infinity, which of following is incorrect?

Consider radioactive decay of A to B which , further decays either to X or Y, andlambda subscript 1 end subscript comma lambda subscript 2 end subscript comma lambda subscript 3 end subscript are decay constants for A to B decay, B to X decay and B to Y decay respectively At t =0, the number of nuclei of A,B,X and Y are N subscript 0 end subscript , N subscript 0 end subscript zero and zero respectively N subscript 1 end subscript comma N subscript 2 end subscript comma N subscript 3 end subscript text  and  end text N subscript 4 end subscript are the number of nuclei of A,B,X and Y are at any instant t.

At t equals infinity, which of following is incorrect?

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Consider radioactive decay of A to B which , further decays either to X or Y, andlambda subscript 1 end subscript lambda subscript 2 end subscript lambda subscript 3 end subscript are decay constants for A to B decay, B to X decay and B to Y decay respectively At t =0, the number of nuclei of A,B,X and Y are N subscript 0 end subscript , N subscript 0 end subscript zero and zero respectively N subscript 1 end subscript comma N subscript 2 end subscript comma N subscript 3 end subscript text  and  end text N subscript 4 end subscript are the number of nuclei of A,B,X and Y are at any instant t.

The number of nuclei of B will first increase and then after a maximum value, it decreases for

Consider radioactive decay of A to B which , further decays either to X or Y, andlambda subscript 1 end subscript lambda subscript 2 end subscript lambda subscript 3 end subscript are decay constants for A to B decay, B to X decay and B to Y decay respectively At t =0, the number of nuclei of A,B,X and Y are N subscript 0 end subscript , N subscript 0 end subscript zero and zero respectively N subscript 1 end subscript comma N subscript 2 end subscript comma N subscript 3 end subscript text  and  end text N subscript 4 end subscript are the number of nuclei of A,B,X and Y are at any instant t.

The number of nuclei of B will first increase and then after a maximum value, it decreases for

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Consider radioactive decay of A to B which , further decays either to X or Y, andlambda subscript 1 end subscript lambda subscript 2 end subscript lambda subscript 3 end subscript are decay constants for A to B decay, B to X decay and B to Y decay respectively At t =0, the number of nuclei of A,B,X and Y are N subscript 0 end subscript , N subscript 0 end subscript zero and zero respectively N subscript 1 end subscript comma N subscript 2 end subscript comma N subscript 3 end subscript text  and  end text N subscript 4 end subscript are the number of nuclei of A,B,X and Y are at any instant t.

The net rate of accumulation of B at any instant is

Consider radioactive decay of A to B which , further decays either to X or Y, andlambda subscript 1 end subscript lambda subscript 2 end subscript lambda subscript 3 end subscript are decay constants for A to B decay, B to X decay and B to Y decay respectively At t =0, the number of nuclei of A,B,X and Y are N subscript 0 end subscript , N subscript 0 end subscript zero and zero respectively N subscript 1 end subscript comma N subscript 2 end subscript comma N subscript 3 end subscript text  and  end text N subscript 4 end subscript are the number of nuclei of A,B,X and Y are at any instant t.

The net rate of accumulation of B at any instant is

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The mass of nucleus blank subscript Z end subscript X to the power of A end exponent is less than the sum of the mases of (A - Z) number of neutrons and Z number of protons in the nucleus The energy equivalent to the corresponding mass difference is known as the binding energy of the nucleus A heavy nucleus of mass M can break into two light nuclei of mass m1 and m2 M only if open parentheses m subscript 1 end subscript plus m subscript 2 end subscript close parentheses less than M Also two light nuclei of mass m3 and m4 can undergo complete fusion and form a heavy nucleus of mass M “only if open parentheses m subscript 3 end subscript plus m subscript 4 end subscript close parentheses greater than M to the power of ´ ´ end exponent The masses of some netural atoms are given in the table below.

The kinetic energy (in keV) of the alpha particle, when the nucleus at rest undergo alpha decay, is

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The kinetic energy (in keV) of the alpha particle, when the nucleus at rest undergo alpha decay, is

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The mass of nucleus blank subscript Z end subscript X to the power of A end exponent is less than the sum of the mases of (A - Z) number of neutrons and Z number of protons in the nucleus The energy equivalent to the corresponding mass difference is known as the binding energy of the nucleus A heavy nucleus of mass M can break into two light nuclei of mass m1 and m2 M only if open parentheses m subscript 1 end subscript plus m subscript 2 end subscript close parentheses less than M Also two light nuclei of mass  m3 and m4 can undergo complete fusion and form a heavy nucleus of mass M “only if open parentheses m subscript 3 end subscript plus m subscript 4 end subscript close parentheses greater than M to the power of ´ ´ end exponent The masses of some netrural atoms are given in the table below.

The correct statement is

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The correct statement is

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From the figure describing photoelectric effect we may infer correctly that

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Figure represents a graph of kinetic energy of most energetic photoelectrons, Kmax (in eV), and frequency (v) for a metal used as cathode in photoelectric experiment. The threshold frequency of light for the photoelectric emission from the metal is

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OxidationstateofFeincompound(F)is:

OxidationstateofFeincompound(F)is:

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Compound(A)is:

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chemistry-General
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An aqueous solution of an inorganic compound (X)givesthe followingreactions:
i) Withan aqueous solutionof B a C l subscript 2 end subscript,aprecipitateinsolubleindiluteHClisobtained

ii) Addition of excess of KI gives a brown precipitate which turns white on addition of excess hypo solution

iii) With an aqueous solution of potassium ferrocyanide a chocolate colored ppt is obtained.

Identify X-
 

An aqueous solution of an inorganic compound (X)givesthe followingreactions:
i) Withan aqueous solutionof B a C l subscript 2 end subscript,aprecipitateinsolubleindiluteHClisobtained

ii) Addition of excess of KI gives a brown precipitate which turns white on addition of excess hypo solution

iii) With an aqueous solution of potassium ferrocyanide a chocolate colored ppt is obtained.

Identify X-
 

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