IIT-JEE 1979

Paper was held on
Wed, Apr 11, 1979 9:00 AM

## Chemistry

The largest number of molecules is in

View Question 2.76 g of silver carbonate on being strongly heated yields a residue weighing

View Question A gaseous mixture contains oxygen and nitrogen in the ratio of 1 : 4 by weight. Therefore the ratio of their no of molec

View Question The total number of electrons is one molecule of carbon dioxide is

View Question 4.215 g of a metallic carbonate was heated in a hard glass tube and the CO2 evolved was found to measure 1336 ml at 27oC

View Question (a). 5.5 g of a mixture FeSO4.7H2O and Fe2(SO4)3.9H2O requires 5.4 ml of 0.1 N KMnO4 solution for complete oxidation. Ca

View Question 5 ml of a gas containing only carbon and hydrogen were mixed with an excess of oxygen (30 ml) and the mixture exploded b

View Question In the analysis of 0.5 g sample feldspar, a mixture of chlorides of sodium and potassium is obtained which weighs 0.1180

View Question The number of neutrons in dipositive zinc ion with mass number 70 is

View Question The compound which contains both ionic and covalent bonds is

View Question The octet rule is not valid for the molecule

View Question Account for the following : Limit your answer to two
sentences.
"Atomic weights of most of the elements are fractional."

View Question A white amorphous powder (A) on heating yields a
colourless, non-combustible gas (B) and a solid (C).
The latter compoun

View Question The precipitation of second group sulphides in qualitative
analysis is carried out with hydrogen sulphide in the presenc

View Question ## Mathematics

If $$\tan \theta = - {4 \over 3},then\sin \theta \,is\,$$

View Question If $$\alpha + \beta + \gamma = 2\pi ,$$ then

View Question If the cube roots of unity are $$1,\,\omega ,\,{\omega ^2},$$ then the roots of the equation $${\left( {x - 1} \right)^3

View Question If x + iy = $$\sqrt {{{a + ib} \over {c + id}}} $$, prove that $${({x^2} + {y^2})^2} = {{{a^2} + {b^2}} \over {{c^2} + {

View Question (a) Draw the graph of $$y = {1 \over {\sqrt 2 }}\left( {cinx + \cos x} \right)$$ from $$x = - {\pi \over 2}$$ to $$x =

View Question If $$\alpha ,\,\beta $$ are the roots of $${x^2} + px + q = 0$$ and $$\gamma ,\,\delta $$ are the roots of $${x^2} + rx

View Question The equation x + 2y + 2z = 1 and 2x + 4y + 4z = 9 have

View Question If x, y and z are real and different and $$\,u = {x^2} + 4{y^2} + 9{z^2} - 6yz - 3zx - 2xy$$, then u is always.

View Question Let a > 0, b > 0 and c > 0. Then the roots of the equation $$a{x^2} + bx + c = 0$$

View Question If $$\ell $$, m, n are real, $$\ell \ne m$$, then the roots by the equation :
$$(\ell - m)\,{x^2} - 5\,(\ell + m)\,x

View Question Given that $${C_1} + 2{C_2}x + 3{C_3}{x^2} + ......... + 2n{C_{2n}}{x^{2n - 1}} = 2n{\left( {1 + x} \right)^{2n - 1}}$$

View Question $${}^n{C_{r - 1}} = 36,{}^n{C_r} = 84\,\,and\,\,{}^n{C_{r + 1}} = 126$$, then r is :

View Question The harmonic mean of two numbers is 4.Their arithmetic mean $$A$$ and the geometric mean $$G$$ satisfy the relation. $$2

View Question The points $$\left( { - a,\, - b} \right),\,\left( {0,\,0} \right),\,\left( {a,\,b} \right)$$ and $$\left( {{a^2},\,ab}

View Question (a) Two vertices of a triangle are $$(5, -1)$$ and $$(-2, 3).$$ If the orthocentre of the triangle is the origin, find t

View Question Find the derivative of
$$$f\left( x \right) = \left\{ {\matrix{
{{{x - 1} \over {2{x^2} - 7x + 5}}} & {when\,\,x

View Question If the bisector of the angle $$P$$ of a triangle $$PQR$$ meets $$QR$$ in $$S$$, then

View Question (a) If a circle is inscribed in a right angled triangle $$ABC$$ with the right angle at $$B$$, show that the diameter of

View Question (a) A balloon is observed simultaneously from three points $$A, B$$ and $$C$$ on a straight road directly beneath it. Th

View Question Prove that the minimum value of $${{\left( {a + x} \right)\left( {b + x} \right)} \over {\left( {c + x} \right)}},$$
$$a

View Question Evaluate $$\int {{{{x^2}dx} \over {{{\left( {a + bx} \right)}^2}}}} $$

View Question Two fair dice are tossed. Let $$x$$ be the event that the first die shows an even number and $$y$$ be the event that the

View Question Six boys and six girls sit in a row randomly. Find the probability that
(i) the six girls sit together
(ii) the boys a

View Question ## Physics

The dispalcement x of particle moving in one direction, under the action of a constant force is related to the time t by

View Question Answer the following giving reason in brief:
Is the time variation of position, shown in the figure observed in nature?

View Question