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The sum of present ages of Sameer and his father is 54 years. 6 years ago, his fatherwas 6 times as old as his son. Find their present ages?
answered Jul 27, 2017
Let A be Sameer's age and F be Sameer's father's age. $A + F = 54$ $ A = 54 - F $ And 6 yea...
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If the perimeter of the semicircular field is 144 m,then the diameter of th
answered Jul 27, 2017
If 'r' is the radius of the semicircle, then Perimeter of the semicicle = $\pi * r + 2r  = 144...
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The mean of marks obtained in an examination by a group of 100 students
answered Jul 27, 2017
Mean of 100 students = Sum of first 100 students / 100  = 49.96 Sum of first 100 students = 49....
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The sum of present ages of Anil and his father is 54 years. Six years befor
answered Jul 27, 2017
Let A be Anil's age and F be Anil's father's age. $A + F = 54$ $ A = 54 - F $ And 6 years earlier,...
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Observe a one-day cricket match to be held in the year 2016. Prepare a proj
answered Jul 25, 2017
You need to do that work. Observing and recording and then doing the calculations !!!
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Give any six features of the human genome.
answered Jul 23, 2017
Six features of human genome are:a. Human genome contains 3164.7 million nucleotide bases.b. Th...
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A few statements are given below followed by a set of terms. Pick the correct term and write it agai
answered Jul 20, 2017
a. Mating of closely related individuals within the same breed. Inbreedingb. Mating of animals of th...
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Explain the origin of spectral lines of hydrogen spectrum on basis of Bohr's theory.
answered Jul 20, 2017
Lyman series:According to Bohr, this series arises when an electron jumps to the first orbit $(m = 1...
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Obtain the relation for frequency of spectral lines emitted from hydrogen atoms.
answered Jul 20, 2017
We know that $E = \frac{-m}{8 \varepsilon_0 Z^2 e^4 n^2 h^2}---(1)$$= \frac{RZ^2}{n^2}$$  ...
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How can you, as an individual , prevent the loss of biodiversity?
 answered Jul 20, 2017
 Reducing the exploitation and utilization of articlesformed from forest products. Encouragin
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Calculate the energy level of an electron in $n^{th}$ orbit or derive an equation for the energy of
answered Jul 20, 2017
BOHR'S POSTULATES : There are four postulates (a) Electrons in an atom move in circular or...
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answered Jul 19, 2017
Diffraction at a Single SlitS is a monochromatic source of light. It is placed on the focal plane of...
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Explain polarisation by reflective. State and Prove Brewster's law.
answered Jul 19, 2017
To understand the phenomenon of polarisation, you can perform a simple activity.Take two card boards...
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Derive an expression for intensity at any point on the observation serem in the young’s double sli
answered Jul 19, 2017
Intensity of fringes: To analyse the interference pattern, we calculate the intensity of the br...
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Find the arc length of an circle of radius 5 cm substending a central angle
answered Jul 19, 2017
Arc length = $ r * \theta $( in radians ) = $5 * \frac{pi}{12} \; cm$  ( in radians, 15 degrees...
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Observe a one-day cricket match to be held in the year 2016. Prepare a proj
answered Jul 19, 2017
You need to do that work. Observing and recording and then doing the calculations !!!
0 votes
Explain the Eliminations reaction.
answered Jul 19, 2017
Dehydrohalogenation is a β – elimination reaction in which halogen is from α-carbon atom and the hyd
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What is meant by ‘disproportionation’ of an oxidation state? Give an example
answered Jul 19, 2017
When a particular oxidation state becomes less stable  relative to other oxidation states, one ...
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Give the Preparation of Potassium dichromate (K2Cr2O7)
answered Jul 19, 2017
It is prepared by fusion of chromate ore (FeCr2O4) with sodium carbonate in excess of air.https://cl...
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State Huygen's principle and also explain their propagation of waves
answered Jul 19, 2017
Huygens' postulated that light is a wave, which travels through a hypothetical medium called ether. ...
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Why Carboxylic acids have higher boiling point than aldehyde ketone and alcohols?
answered Jul 19, 2017
Carboxylic acids are higher boiling liquids than aldehydes, ketones and even alcohols of comparable ...
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Explain the method of preparation of carboxilic acid from (1) Alcohols (2) Aldehyde
answered Jul 19, 2017
(i)From alcohols: Primary alcohols are readily oxidised to carboxylic acids with common oxidising ag...
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List the methods to Test to distinguish aldehydes and ketone
answered Jul 19, 2017
Tollen’s test: When an aldehyde is heated with Tollen’s reagent it forms silver mirror.  T
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Explain Haloform Reaction
answered Jul 19, 2017
Haloform reaction: Aldehydes and ketones having at least one methyl  group linked to the carbon...
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Give any two methods of preparation of Ketones
answered Jul 19, 2017
By dehydrogenation of alcohols: When the vapours of a secondary alcohol are passed over heated coppe...
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Define Ketone
answered Jul 19, 2017
Ketones are the organic compounds in which carbonyl group is attached to two alkyl group or ary...
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Explain Gatterman –Koch reaction
answered Jul 19, 2017
Benzene or its derivatives on treatment with carbon monoxide  and HCl in presence of anhydrous ...
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Explain any two methods of Preparation of aldehydes.
answered Jul 19, 2017
1. By oxidation of alcohols: Oxidation of primary alcohols in presence of oxidizing agent like ...
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Find the smallest number which must be added to the following =1750
answered Jul 18, 2017
Question incomplete.
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answered Jul 18, 2017
The refractive index $\mu$ has been defined as the ratio of the speed of light in vacuum to the spee...
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What is the smallest number by which 2592 has To be divided to make it a pe
answered Jul 18, 2017
$2592 = 2 * 1296 = 2 * 2 * 648 = 2^3 * 2 * 162 = 2^3 * 2^2 * 81 = 2^3 * 2^2 * 3^3 * 3 $ So multiply...
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Explain any two methods of Preparation of aldehydes.
answered Jul 18, 2017
1. By oxidation of alcohols: Oxidation of primary alcohols in presence of oxidizing agent like ...
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Define Aldehydes
answered Jul 18, 2017
Aldehyde are the organic compounds in which carbonyl group is attached to one hydrogen atom and...
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What is Woods Sprint.
answered Jul 18, 2017
Wood spirit Methyl  alcohol is also called wood spirit. It is obtained by destructive  dis...
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Give the uses of Ethers.
answered Jul 18, 2017
The common uses of ethers include:We use dimethyl ether as a refrigerant and as a solvent at low tem...
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How to distinguish between (i) Phenol and alcohol (ii) Prima
answered Jul 18, 2017
(i)Phenol on reaction with neutral FeCl3 gives purple colour whereas alcohols do not give purpl...
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Phenol is more acidic than Alcohols. Why?
answered Jul 18, 2017
Phenol is more acidic than alcohols due to stabilisation of phenoxide ion through resonance. Presenc...
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Why Alcohols and Phenols are soluble in water.
answered Jul 18, 2017
Solubility of alcohols and phenols are soluble in water due to their ability to form hydrogen  ...
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Give the preparation of Alcohols from Carbonyl Compounds
answered Jul 18, 2017
https://clay6.com/mpaimg/2_t1.jpg(a)By reduction of aldehydes and ketonesAldehydes yield primary&nbs...
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Give the classification Alcohols.
answered Jul 18, 2017
(i)monohydric-containing one  OR group, (ii)dihydric-containing two – OR groups and (iii
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answered Jul 18, 2017
The phenomenon of scattering is a two step process : absorption of light by the scattering particle ...
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How are Alcohols and Phenols are formed.
answered Jul 18, 2017
Alcohols and phenols are formed when a hydrogen atom in hydrocarbon, aliphatic and aromatic respecti...
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x+y+z=o, 2x+5y+7z=52, 2x+y-z=0 solve the following system of equations usi
answered Jul 18, 2017
https://clay6.com/qa/7423/solve-by-matrix-inversion-method-following-system-of-linear-equation-x-y-z...
0 votes
Solve the following linear equations using the matrix method : $x+y+z=9,2x+5y+7z=52,2x+y-z=0$.
answered Jul 18, 2017
https://clay6.com/qa/7423/solve-by-matrix-inversion-method-following-system-of-linear-equation-x-y-z...
0 votes
answered Jul 17, 2017
Consider a rectangular coil $PQRS$ suspended in a uniform magnetic field $\overrightarrow{B},$ with ...
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answered Jul 17, 2017
Expression for the force between two parallel current carrying wires.Consider two long parallel wire...
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There are 4 cards numbered 1,3,5, and 7, one number on one card. Two cards
answered Jul 17, 2017
X can be one of { 4, 6, 8, 10, 12 } So Mean is = $\frac{4+6+8+10+12}{5} = 8$ Variance - ( -4, -2,...
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203 evaluate ∑ir r=1
answered Jul 17, 2017
Question is not clear...not sure where the summation ends Assuming till infinity. Let s = $\sum_{r...
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X^2+(a÷a+b +a+b÷a)x +1
answered Jul 17, 2017
$x^2 + ( \frac{a}{a+b} + \frac{a+b}{a} )x + 1 $ $x^2 + (\frac{1}{1 + \frac{b}{a}} + (1+\frac{b}{a})...
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What is cyclotron? Discuss the principle,construction,theory and working of a cyclotron.What is the
answered Jul 17, 2017
It is a device used to accelerate charged particles like protons, deutrons, $\alpha$-particles, etc,...
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