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In the following common emitter configuration, an $\text{NPN}$ transistor with current gain $\beta =100$ is used. The output voltage of the amplifier will be

A real gas most closely approaches the behaviour of an ideal gas at

The charge/size ratio of a cation determines its polarizing power. Which one of the following sequences represents the increasing order of the polarizing power of the cationic species, $K^{+},C{a}^{2+},M{g}^{2+},B{e}^{2+}$

Match the polymers given in Column I with the type of linkage present in them given in Column II.

$\begin{array}{cc}ColumnI& ColumnII\\ A.Terylene& 1.Glycosidiclinkage\\ B.Nylon& 2.Esterlinkage\\ C.Cellulose& 3.Phosphodiesterlinkage\\ D.Protein& 4.Amidelinkage\\ E.RNA& \end{array}$

In the reaction,
$H{C}_2{O}_4^{-}+P{O}_4^{3-}\rightleftharpoons HP{O}_4^{2-}+C_2{O}_4^{2-}$
The Bronsted bases are:

Calculate
the emf of the cell in which the following reaction takes place:

Given
that
=
1.05 V

The value of ${△}_f{G}^{\circ }$ for formation of $C{r}_2{O}_3$ is - 540 KJ/mol and that of $A{l}_2{O}_3$ is - 827 kj/ mol. Is the reduction of $C{r}_2{O}_3$ possible with AI?

In graphite, carbon atoms are joined together due to:

Which of the following represent saponofication reaction?

Identify the correct ascending order of $\alpha ,\beta \text{and}\gamma$ rays with reference to their ionizing power.

$\left(I\right)\alpha -ray$, $\left(II\right)\gamma -ray$, $\left(III\right)\beta -ray$

In which of the following reaction ketone is formed?

What is the product formed when Gallic acid is heated?

25g of 80% pure Ca$C{O}_3$ is made to react with excess of HCl. Calculate volume of $C{O}_2$ evolved at NTP.

Alkanes having tertiary H atom can be oxidized to alcohols in presence of:

In the reaction

Chlorine undergoes

1 g of a compound contains 0.433 g of sodium, 0.453 g oxygen by mass, and the rest is carbon. What is the molecular formula of the compound if its molecular weight is 106?



[1 mark]

Arrange
the following in the order of property indicated for each set:

(i)
F₂,
Cl₂,
Br₂,
I₂
- increasing bond dissociation enthalpy.

(ii)
HF,
HCl, HBr, HI - increasing acid strength.

(iii)
NH₃,
PH₃,
AsH₃,
SbH₃,
BiH₃
− increasing base strength.

Gaseous benzene reacts with hydrogen gas in the presence of a nickel catalyst to form gaseous cyclohexane accoding to the reaction: $C_6{H}_6\left(g\right)+3H_2\left(g\right)\to C_6{H}_{12}\left(g\right)$
A mixture of $C_6{H}_6$ and excess $H_2$ has a pressure of 60 mm of $Hg$ in an unknown volume. After the gas has been passed over a nickel catalyst and all the benzene is converted to cyclohexane, the pressure of the gas was 30 mm of $Hg$ at the same volume and temperature. The fraction of $C_6{H}_6$ (by volume) present in the original volume is:

Which of the following is most reactive for $S_{N}2$ reaction ?

A balloon having a volume of $4200{\text{m}}^3$ is filled with a gas at ${27}^{\circ }\text{C},and1$ bar pressure. It weighs $700\text{kg}$. If the density of air is $1.2{\text{kg m}}^{-3}$, then the pay load of the balloon is:

A solution containing $30\text{g}$ of a non-volatile solute in exactly $90\text{g}$ of water has a vapour pressure of $21.85\text{mm of Hg}$ at ${25}^{o}C.$ Further, $18\text{g}$ of water is then added to the solution, the new vapour pressure becomes $22.15\text{mm of Hg}$ at ${25}^{o}C.$ Calculate:

(i) Molar mass of the solute (in g/mol) and

(ii) Vapour pressure of water at ${25}^{o}C.$

[BHU 2000; Pb. PMT 2000; Kerala 2003]

The geometry and the hybridization present about the central atom in $B{F}_3$ is :

Among the following the inner orbital complex is

Explain why ethene decolourises bromine water whereas ethane does not.