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90 min = of an hour(fraction).

Which of the following will give aldol condensation?

Calculate the work done in erg for the isothermal reversible expansion of $1mole$ of an ideal gas from volume of $10l$ to $20l$ at ${25}^{o}C$ is $(R=8J{K}^{-1}mo{l}^{-1})$:

Commercialy available concentrated HCl contains 38% HCl by mass ?

1) What is the molarity of the solution ? ( d = 1.19 g/mL)

2) What volume of concentrated HCl is required to make 1 L of 0.1 M of HCL ?

Write
the mechanism of hydration of ethene to yield ethanol.

When benzaldehyde is nitrated we get:

The type
of hybridisation of boron in diborane is

(a)
sp
(b) sp²
(c) sp³
(d) dsp²

Which of the following is forward biased diode connection ?

The simplest formula of a compound containing $50\%$ of element X (atomic mass 10) and $50\%$ of element Y (atomic mass 20) is

The correct set of four quantum numbers for the valence electron of Rubidium (Z = 37) is:

A cylindrical tube of cross-sectional area $A$ has two air tight frictionless pistons at its two ends. The pistons are tied with a straight two ends. The pistons are tied with a straight piece of metallic wire. The tube contains a gas at atmospheric pressure $P_0$ and temperature $T_0$. If temperature of the gas is doubled then the tension in the wire is

For chromium number of electrons present in magnetic quantum number zero is

The standard enthalpies of formation at 300 K for $CC{l}_4\left(l\right),H_{2}O\left(g\right),C{O}_2\left(g\right)andHCl\left(g\right)are-107,-242,-394and-93kJmo{l}^{-1},$ respectively. The value of $△U_{300}^o$ for the reaction:



$CC{l}_4\left(l\right)+2H_{2}O\left(g\right)\to C{O}_2\left(g\right)+4HCl\left(g\right)$ is

Calculate the oxidation number of sulphur, chromium and nitrogen in H₂SO₅,–. Suggest structure of these compounds. Count for the fallacy.

Burst the buubles with correct addition equations.

Two solutions of $KN{O}_3$ and $C{H}_{3}COOH$ are prepared separately having the same molar concentration.
The correct relationship between the osmotic pressures is

The reaction $\frac{1}{2}{H}_2\left(g\right)+AgCl\left(aq\right)\to H^{+}\left(aq\right)+Ag\left(s\right)$ can be represented in the galvanic cell as:

In earth's crust, tin occurs as:

Which of the following configuration represent alkaline earth metal:

ClCH₂CH₂OH is stronger acid than CH₃CH₂OH because of:

A sub shell with l = 2 can take up a maximum of:

Which is the major product expected from the following $S{N}^2$ reaction

Alcohols are weakly acidic in nature and react with active metals.What are the products formed in this reaction?

Which of the following statements are correct about the reactivities of (I) n -propyl chloride and (II) allyl chloride.