Arrange the following in increasing order of their conductivity
(A) Silicon
(B) Germanium
(C) Sodium
(D) Glass
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Answer the question on the basis of passage given below :
One of the notable features of the transition element is the great variety of oxidation states it may show in its compounds. The elements which give the greatest number of oxidation states occur in or near the middle of the series. Manganese, for example exhibits all the oxidation states from +2 to +7. The lesser number of oxidation states at the extreme ends is either due to losing or sharing of few electrons (Sc, Ti) or too many d electrons of higher valence. Early in the first series scandium (II) is virtually unknown and titanium (IV) which is more stable than Ti (III) or Ti (II). On the other end, the only oxidation state of zinc is \(+ 2\).
For balancing the given reaction, value of \(x\) will be.
\(4 FeCr_2 O_4+Na_2 CO_3+7 O_2 \longrightarrow x Na_2 CrO_4+2 Fe_2 O_3+8 CO_2\)

Read the passage carefully and answer the questions
The speed at which a chemical reaction takes place is called the rate of reaction. The rate of reaction depends on various factors like concentration of the reactants, temperature, etc. The relation between the rate of reaction and the concentration of reacting species is represented by the equation r = k[A]^x[B]^y, where x and y are the order of the reaction with respect to the reactants A and B, respectively. The overall order of the reaction is x + y. The rate of reaction can also be increased by the use of a catalyst which provides an alternate pathway of lower activation energy. It increases the rate of forward and backward reaction to an equal extent. It does not alter the Gibbs energy of the reaction.
The rate law of a reaction is given by r = k[CH₃OCH₃]^3/2. If the pressure is measured in bar and time in minutes, then the unit of rate constant will be

Aqueous \(CuSO _4\) solution gives green precipitate of \(( X )\) with aqueous KF.
Correct formula of X is:

Which one of the following statements regarding electrolytic solution is not correct?

The purest form of commercial iron is

What is the total number of chiral carbons present in glucopyranose and fructofuranose respectively?

Arrange the steps of agarose gel electrophoresis in a correct sequence :
(A) Visualisation of DNA fragments under UV light
(B) Movement of the DNA fragments under electric field towards anode
(C) Loading the DNA in the wells
(D) Staining of DNA fragments with ethidium bromide
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An organic compound (A), C9H10O, gives a 2,4-DNP reaction, negative Tollens' test and iodoform test. On drastic oxidation with chromic acid, it forms B, having molecular formulae, C7H6O2. Identify A and B.

Which of the following electrolytes will have maximum coagulating value for \(\text{AgI/Ag}^{+}\) sol?

Electromagnetic waves travel in a medium at a speed of \( 1.5 \times 10^8 \text{ m/s} \). The relative permeability of the medium is 0.4. The relative permittivity of the medium will be:

Which of the following statements are correct?
(A) When light rays undergoes two internal reflections inside a raindrop, a secondary rainbow is formed.
(B) The angle between the emergent ray and angle of prism is called the angle of deviation.
(C) Light undergoes successive total internal reflections as it move through an optical fibre.
(D) A telescope provides angular magnification of distant objects.
(E) A simple magnifier is a diverging lens of small focal length.
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Which of the following are not electromagnetic waves?
A. Gamma rays
B. Cathode rays
C. X-rays
D. \(\beta\)-rays
E. Radio waves
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