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The conversion of molecules A to B follows second order kinetics. Doubling the concentration of A will increase the rate of formation of B by a factor of

In the process of evaporation, which one of the following pieces of laboratory apparatus would not be used?

How is the rate of chemical reaction affected when the surface area of the reactant is increased? Give an example in support of your answer.

Complete the following

$2A{l}_2{O}_3+3C\to 4A+3B$. A & B are as follows.

Which of the following hydroxides of alkaline earth metals is least basic

What is the possibility of the value of the difference in electronegativity in carbon dioxide?

Which of the following options is/are wrong about the reaction given below?

$Zn+2HCl\to ZnC{l}_2+H_2$

You are given a mixture of iodine in alcohol called tincture iodine. Which method will you use to recover both, iodine as well as alcohol, from this mixture ?

(a) evaporation (b) simple distillation (c) fractional distillation (d) crystallisation

The latent heat of fusion of ice is:

(a) 33.4 $\times {10}^{5}J/Kg$ (b) 22.5 $\times {10}^{5}J/Kg$
(c) 33.4 $\times {10}^{4}J/Kg$ (d) 2.25 $\times {10}^{4}J/Kg$

Chemical substances having a net charge is called ___________.

Define the following terms:

(a) Melting (b) Boiling

Which of the following element(s) is/are alkali metals.

Choose the correct option for the underlined phrase.

The coffee tastes very bad.

Which one of the following statements is true according to Rutherford's nuclear model of an atom?

Which of the following is/are uses of $C{O}_2$?

Name the elements that are in liquid state at room temperature.

Which of the following pairs are isobars ?

$\left(i\right){}_{26}^{58}A,{}_{28}^{58}B\left(ii\right){}_{35}^{79}X,{}_{35}^{80}Y$

Give reasons for your choice.

Lewis-Kossel structure of $N_2$ is

In the diagram below it depicts the structure of atom, where we are able to see orbits and electrons. How many neutrons and electrons are present in the nucleus?

Find the valency of Pb in PbO

How many moles of O₂ are there in 1.20 × 10²² oxygen molecules?

difference between crystalisation and evaporation? can we get pure salt only by evaporation?

What are the main difference s between sublimes and sublimates.

Her skirt was blue ____________ white dots.

Given elements X, Y and Z with atomic masses a,b and c are said to form Dobereiner's triad. Which of the following statement is true if its known that a > b > c?

Which of the following options is not an isotope of carbon?

Milk of Magnesia is:

(a) a colloid (b) a true solution

(c) a homogeneous maixture (d) a suspension

Differentiate between compounds and mixtures.(5 points )

What difference in the property of two miscible liquids enables their separation by fractional distillation ?

The number of protons in one atom of an element X is 8. What will be the number of electrons in its ion $X^{2-}$
(a) 8 (b) 9 (c) 10 (d) 11

Ice at 0 degrees Celcius is more effective in cooling as compared to water at 0 degrees Celcius. Why?

Which of the following has the largest number of atoms?

Concentrated nitric acid, upon long standing, turns yellow-brown due to the formation of:

3 and 6 electrons are present in outer-most orbit of A and B respectively. The chemical formula of its compound will be

The ionic compound formed by the ions ${\text{Fe}}^{3+}$ and $({\text{SO}}_4{)}^{2-}$ has the chemical formula ________.

The chemical formula of the ionic compound containing copper(II) & sulphate ions is .

How can a true solution be separated by physical means

In LiF, the structure of $F^{-}$ is

The reaction of sodium highly exothermic sodium with H₂O. The rate of reaction is lowered by

Why is water at 273K more effective in cooling than water at the same temperature?

Which of the following statements about a mixture is incorrect?