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Of the following hydrides which has the lowest boiling point?

A.why do we need to classify elements?

B.explan Genesis of periodic classification?(In point wise)

The metal to be plated is always placed at__.

If we consider the mass of carbon atom is taken for the relative atomic mass unit as $\frac{1}{6}$, in place of $\frac{1}{12}$ , the mass of one mole of a substance will

What is the mass of $120c{m}^3$ of carbon dioxide at S.T.P?

Electron affinity depends on

Give the common names and IUPAC names of the following compounds :
(a) $HCOOH$ (b) $C{H}_{3}COOH$

Silicon dissolve in aquesous sodium hydroxide to liberate -

Question 8
In an ecosystem, the 10% of the energy available to the next trophic level is in the form of

(a) heat energy
(b) light energy
(c) chemical energy
(d) mechanical energy

Which of the following is correct order with respect to acidic nature :

The process in which ores are changed into oxides by heating strongly in limited air is known as:

Which of the following is amphoteric in nature?

Which of the following statements is correct?

Noble metals like gold and platinum can be dissolved in :

If we add zinc in sulphuric acid what will happen?

Fill in the blank (do not have to balance):
$MgO+HCl\to$__________

What is distant formula

why sodium metal or potassium metal are kept in petrol, etc, why not in water i know that? i know that oxygen is supporter of combustion and hydrogen is highly flammable but petrol also contains hydrogen.

State why nitrogenous matter produces ammonia. State a liquid source of ammonia

Calculae the mass of 0.1 mole of each of the following :
(a) $CaC{O}_3$ ,

(b) $N{a}_{2}S{O}_4.10H_{2}O,$
(c) $CaC{l}_2,$

(d) Mg.

(Ca = 40, Na = 23, Mg = 24, S= 32, C= 12, Cl = 35.5, 0 = 16, H = 1 )

Current in a wire is due to the flow of electrons in the wire although the drift speed of the electron is very small yet an electric bulb lights up soon as it is switched on explain why

If the concentration of H+(aq) ions decreases the pH will increase.how?

All elements combine to obey octet rule except hydrogen. Why?

An organic compound 'A' has molecular formula ${\text{C}}_2{\text{H}}_4{\text{O}}_2$and is acidic in nature. On heating with alcohol and conc. sulphuric acid, vapours with pleasant or fruity smell are given out. What is this chemical compound 'A' and what is the chemical equation involved in the reaction? [3 MARKS]

At what temperature, the volume of 'V' of a certain mass of a gas at ${37}^{o}C$ will be doubled, keeping the pressure constant?

Give the name and structural formula of one member of the following of alcohols

For an exothermic reaction like the production of ammonia, if the temperature of the reaction is increased the reaction ____

__ is the phenomenon of the conduction of electricity through electrolytes by chemical decomposition.

List some of the uses of acids.

Of the following elements, which one has highest electro-negativity

Which property of ammonia can be proved from the fountain experiment?

Assertion: The plant biomass which serves as the food of herbivores and decomposers is said to result from the gross primary productivity.
Reason: Gross primary productivity is the rate at which consumers convert the chemical energy of their food into their own biomass.

Unprocessed oil obtained from earth's crust is known as_________

What is the name of the functional group -COOH?

Chain isomer of

$C{H}_3-C{H}_2-\stackrel{\underset{||}{O}}{C}-C{H}_2-C{H}_3$ is

Four elements A, B, C and D have the following electron arrangements in their atoms:
$$\begin{array}{cc}A& 2,8,6\\ B& 2,8,8\\ C& 2,8,8,1\\ D& 2,7\end{array}$$
(a) What type of bond is formed when element C combines with element D?
(b) Which element is an inert gas?
(c) What will be the formula of the compound between A and C?

Monochromatic light refers to light that has:

The specific rate for a reaction increases by a factor of 4, if the temperature is increased by ${20}^{\circ }C$ from T. The activation energy for the reaction is $55.776kJmo{l}^{-1}$. The value of T is
(Take $ln2=0.7$, $R=8.3Jmo{l}^{-1}{K}^{-1})$

Describe how sodium and chlorine atoms are changed into ions when they react with each other to form sodium chloride, NaCl. What is the name given to this type of bonding? (At. No of sodium = 11; At. No, of chlorine = 17)

Two important man-made silicates are

Among the following, the molecule with the highest dipole moment is

[IIT-JEE (Screening) 2003]

Which of the following are not the structural isomers of $C_6{H}_{14}$ ?

Which of the following increases the rate of rusting?

The cell potential $\left(E_{cell}\right)$ of a reaction is related as $\Delta G=nF{E}_{cell}$, where $\Delta G$ represents maximum useful electrical work.
n = no. of moles of electrons exchanged during the reaction.
For reversible cell reaction $d\left(\Delta G\right)=\left(\Delta V\right)dp-\left(\Delta S\right)dT$
At const. P, $d\left(\Delta G\right)=-\left(\Delta S\right)dT$
At const. P, $\Delta G=\Delta H-T\Delta S$. (1)
$\therefore \Delta G=\Delta H+T{\left(\frac{d\left(\Delta G\right)}{\Delta T}\right)}_P$. (2)
${\left(\frac{d{E}_{cell}}{dT}\right)}_p$ is known as temperature coefficient of the emf of the cell.

The temperature coefficient of the emf the cell, ${\left(\frac{dE}{dT}\right)}_p$ is given by