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Which technique will you use to separate a mixture of carbon tetrachloride and water

We find water droplets on the surface of leaves, especially in the early morning. This is because of:

Define the rate of a chemical reaction.

Which one of the following isotope is used as a fuel in nuclear reactors?

Name one pair of substances whose mixture can be separated by fractional distillation.

When hydrogen is passed over a black solid compound A , the products are 'a colourless liquid' and 'a reddish brown metal B.'

Substance B is divided into two parts, each placed in seperate test tubes.

Dilute HCI is added to one part of substance B and dilute $HN{O}_3$ to the other.

(a) Name the substances A and B.

(b) Give two tests for the colourless liquid formed in the experiment.

(c) What happens to substance A when it reacts with hydrogen ? Give reasons for your answer.

(d) Write an equation for the reaction between hydrogen and substance A.

(e) Is there any reaction between substance B and silute hydrochloric acid ? Give reasons for your answer.

An inflated air balloon collapsed when pricked with a pin. Which state and property is shown by this observation?

What is the colour of pure hydrochloric acid?

Particles in water at 0C have more energy as compared to particles to particles in ice at same temperature. Explain in short and simple answer...

Barium chloride reacts with aluminium sulfate to give aluminium chloride and a precipitate of barium sulfate.

Translate and balance

Give reason for the following

1. Nitric acid in the dilute form is not used in the laboratory preparation of hydrogen from metals.

2. Granulated zinc is preferred to metallic zinc in the preparation of hydrogen using dilute acid.

3. Hydrogen and alkali metals of group [1A] react with copper [II] oxide to give copper.

4. Hydrogen is collected by the downward displacement of water and not even though it is lighter than air.

5. A Mixture of hydrogen and chlorine can be separated by passage through a porous pot

Read the given statements below and choose the correct option.

Statement 1: Isomers have same chemical and physical properties.

Statement 2: Isomers have different chemical formula.

If the temperature of an object is 268 K it will be equivalent to :

(a)-$5^{\circ }C$ (b) +$5^{\circ }C$ (c) ${368}^{\circ }C$ (d) -${25}^{\circ }C$

Blood cells can be separated from plasma cells using which of the following methods?

Arrange Ethane, Ethene and Ethyne in decreasing order of the bond strength between the two carbon atoms in the given hydrocarbons.

In which of the following processes is energy liberated?

Complete the table given below by identifying P, Q, R and S.

$\begin{array}{ccccc}Element& Symbol& No.of& No.of& No.of\\ & & Protons& Neutrons& Electrons\\ Sodum& {}_{11}^{23}Na& 11& P& 11\\ Chlorine& {}_{17}^{35}Cl& Q& 18& 17\\ Uranium& R& 92& 146& 92\\ S& {}_9^{19}F& 9& 10& 9\end{array}$

The molecular formula of a compound is $C_2$$X_6$. X is unknown . If the mass ratio of C to X is 4:1. Find X.

Why don't an atom exist independently? what will happen to it's properties if it exists independently?

How much sugar will be required if each person on earth is given $100$ molecules of sugar? The population of the earth is $3\times {10}^{10}$

The given picture shows a separating funnel filled with the mixture of kerosene and water. Which liquid will form the lower layer?

An electrically neutral atom must have:

Give reasons :

(a) Hydrogen is collected by the downward displacement of water and not of air, even though it is lighter than air.

(b) A candle brought near the mouth of a jar containing hydrogen gas starts burning but is extinguished when pushed inside the jar.

(c) Oxy-hydrogen flame is used for welding and cutting metals.

(d) Apparatus for laboratory preparation of hydrogen should be air tight and away from a naked flame.

For a given value of n (principal quantum number), ionization enthalpy is highest for

The molecular mass of $C{H}_{3}C{H}_{2}OH$ is ______.

Name 2 elements each which exist in

1) Solid state, 2) liquid state, 3) Gas state

Which formula gives the maximum number of electrons in a shell?

Rashi was performing an experiment. She mixed a compound X with water in a beaker. She found that the beaker was becoming hot, releasing heat and forming a new substance Y. She was shocked and left the room leaving the product. After three-four days when she returned, she found that the substance Y has changed into a shiny substance Z. What are X, Y and Z.

Match the chemicals with the impurities they remove during the purification of impure $H_2$ gas.

We can easily move our hand in the air, but to do the same through a solid block of wood, we need a karate expert. Why? [2 MARKS]

What important information is furnished about the nucleus of an atom by the alpha particle scattered experiment of Rutherford?

Element X has electronic configuration 2, 8, 18, 8, 1. Without identifying X,

(a) predict the sign and charge on a simple ion of X.

(b) write if X will be an oxidising agent or a reducing agent. Why ?

How many total metalloids are there in the periodic table ?

Which of the following statement is correct?

20 g silver nitrate solution is added to 20 g of sodium chloride solution what change in mass do you expect after the reaction and why

The atomic number of an element is 20. In modern periodic table, this element is placed in _______ .

Which among the given is formed when zinc reacts with dilute nitric acid?