Conductivity of silicon increases on doping it with phosphorus. Why

In an electrochemical cell, the conventional current flows from -------- to  ----------------

How will you convert bromobenzene to 1-phenylethanol?

Arrange the following in increasing order of basic strength: Aniline, p-Nitroaniline and p-Toluidine

Deficiency of ............. causes scurvy.

Can nucleic acids, proteins and starch be considered as step growth polymers ?

Diphenylhydrazine and terfenadine are ________ drugs.

What type of crystalline solid is graphite?

The catalysts which increases the rate of reaction are called........................catalysts.

'Stability of a crystal is reflected in the magnitude of its melting point Comment. Collect melting point of water, ethyl alcohol, diethyl ether, and methane from a data. What can you say about the intermolecular forces between these molecules?

Compound 'A' was prepared by oxidation 'B' with alkaline KMnO₄.  Compound 'A' on reduction with lithium aluminium hydride gets converted back to compound 'B'.  When compound 'A' is heated with compound B in the presence of H ₂SO₄ it produces fruitly smell of compound C to which family the compounds 'A', 'B' and 'C' belong to?

An element occurs in bcc structure. It has a cell edge length of 250 pm. Calculate the molar mass if its densuty is 8.0 g cm^-3. Also calculate the radius of an atom of this element.

An aqueous solution of 3.12 g of BaCl₂ in 250 g of water is found to boil at 100.0832^oC. Calculate the degree of dissociation of BaCl₂. [K _b (H₂O) = 0.52 K/m.]

Write the name, state of hybridisation, shape and magnetic behaviour of the following complexes
{CoCl₄]^2-, [Ni(CN)₄]^2-, [Cr(H₂O)₂(C₂O₄)₂]^- (Atomic no of Co = 27, Ni = 28, Cr = 24)

Hydrolysis of 2-bromo-3-methylbutane \(\left( 2° \right) \) gives only 2-methyl1-2-butanol \(\left( 3° \right) \).Explain.

Writ e the main products(s) in each of the following reactions:
(i) \({ CH }_{ 3 }-\overset { \underset { | }{ { CH }_{ 3 } } }{ \underset { \overset { | }{ { CH }_{ 3 } } }{ C } } -O-{ CH }_{ 3 }+HI\longrightarrow ?\)
(ii) \({ CH }_{ 3 }-{ CH }={ CH }_{ 2 }\overset { (i){ B }_{ 2 }{ H }_{ 6 } }{ \underset { (ii)3{ H }_{ 2 }{ O }_{ 2 }/OH }{ \longrightarrow } } ?\)
(iii) \({ C }_{ 6 }{ H }_{ 5 }-OH\overset { (i)aq.NaOH }{ \underset { (ii){ CO }_{ 2 },{ H }^{ + } }{ \longrightarrow } } ?\)

(i) Deficiency of which vitamin causes scurvy?
(ii) What type of linkange is responsible for the formation of proteins ?
(iii) Write the product 'formed when glucose is treat with HI.

(a) Define the term 'Chemotherapy'.
(b) While antacids and antiallergic drugs interfere with the function of histamines, why do these not interfere with the function of each other? 

At 10\(°\) C, the average osmotic pressure of blood is 8.8 atm. Find the total concentration of the various constituents in the blood. Assuming that the concentration is the same as the molarity, find the freezing point of the solution (K_f for water = 1.86 K kg mol^-1)

Compound 'A' with molecular formula C₄H₉Br is treated with aq. KOH solution. The rate of this reaction depends upon the concentration of the compound 'A' only. When another optically active isomer 'B' of this compound was treated with aq.  KOH solution, the rate of reaction was found to be dependent on concentration of compound and KOH both.
(i) Write down the structural formula of both compounds 'A' and 'B'.
(ii) Out of these two compounds, which one will be converted to the product with inverted configuration.

(a)  Differentiate between molarity and molality for a solution. How does a change in temperature influence their values?
(b) Calculate the freezing point of an aqueous solution containing 10.50 g of MgBr₂ = 184 g) (K _f for water 1.86 K kg mol^-1)

(a) The molecular masses of polymers are determined by osmotic pressure method and not by measuring other colligative properties. Give two reasons.
(b) At 300 K, 36 g of glucose, C₆H₁₂O₆ present per litre in its solution has an osmotic pressure of 4.98 bar. If the osmotic pressure of another glucose solution is 1.52 bar at the same temperature, calculate the concentration of the other solution.

Three electrolytic cells A, B, C containing solutions of ZnSO₄, AgNO_3, and CuSO₄, respectively are connected in series. A steady current of 1.5 amperes was passed through them until 1.45 g of silver deposited at the cathode of cell B. How long did the current flow? What mass of copper and zinc were deposited?