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Tritium is an isotope of the element:

When water at $0^{\circ }$C freezes to form ice at the same temperature of $0^{\circ }$C, then it :

(a) absorbs some heat (b) releases some heat

(c) neither absorbs nor releases heat (d) absorbs exactly 3.34$\times {10}^5$ J/Kg of heat

According to Fajan's Rule, covalent character is most favoured in ______

What are intermolecular forces ? How are these related to the three state of matter?

The Latin language name of an element is natrium. The English name of this element is:

What are the principles and applications involved in the method of centrifugation

The raw materials used in solvay's process are as follows :

Identify A and B in the below figure of water cycle.

Silvery grey iron filings are added to yellow sulphur powder in a test tube. The contents of the test tube were strongly heated until they glow red. On cooling, it forms a grey dull solid. Which statement is correct about the contents of the test tube in the experiment?

Carbon monoxide is toxic because ___ .

Which of the following statement is correct about the atom of an element ?

(a) an atom can have only protons and neutrons but no electrons.

(b) an atom can have only electrons and neutrons but no protons

(c) an atom can have only electron and proton but no neutron

(d) an atom must always have a proton, neutron and electron

Number of hydrogen molecules present in 3 moles of hydrogen is______.

Question 25
Find the ratio by mass of the combining elements in the following compounds.

(a) $CaC{O}_3$ (d) $C_2{H}_{5}OH$

(b) $MgC{l}_2$ (e) $N{H}_3$

(c) $H_{2}S{O}_4$ (f) $Ca(OH{)}_2$

Which of the following is/are colourless and odourless gases?

Two factors which determine the rate of diffusion of a liquid in another liquid

Hydrogen is readily adsorbed by nickel,palladium at room temperature. One volume of palladium can adsorb 900 volumes of hydrogen. So if I put finely divided palladium in water, will it adsorb all hydrogen and leave only oxygen? If no, why?

Which one of the following is most likely to exhibit Tyndall effect?

(a) sugar and water mixture (b) potash alum and water mixture

(c) chalk powder and water mixture (d) potassium permanganate and water mixture

A hydrated salt, Na₂SO_4^. nH₂O undergoes 56% loss in weight on heating and become anhydrous. The value of n(approximately) will be :

(PLEASE ANSWER IN A EASY TO UNDERSTAND MANNER)

What do you observe when hydrogen gas is passed through soap solution ?

INDENTIFICATION OF CHLORINE GAS

What is the mass of: [3 MARKS]

1. 0.2 mole of elemental oxygen atom
2. 0.5 mole of water molecules
3. 2 mole of cabon dioxide

The size of iso electronic species $F^{‑}$ , $Ne$ and $N{a}^{+}$ is affected by

In Mendeleev’s periodic table, all the elements are sorted by the periodic functions of their ___ .

Define atomicity. What will be the atomicity of ozone and ammonia? [2 MARKS]

State one use of radioactive isotopes in industry.

Which is the correct statement about proton?

Consider the following reaction.

$Cu(N{O}_3{)}_2\to CuO+N{O}_2+O_2$ Which of the following are correct?

What is the difference between molecules and the matter ?

Name the solvent which is known as universal solvent.

The number of moles present in 52g of He(Atomic mass, He = 4) are:

A solution contains 5.6 ml of alcohol mixed with 75 ml of water. Calculate the concentration of this solution.

Name the central part of an atom where protons and neutrons are held togetehr.

What are the advantages of using hydrogen as a fuel?

Which of the following compounds is consumed during the preparation of $N{a}_{2}C{O}_3$ by Solvay's process?

Which of the following materials fall in the category of pure substance

a. Ice

b. Milk

c. Iron

d. Hydrochloric acid

e. Calcium oxide

f. Mercury

g. Brick

h. Wood

I. Air

The correct electronic configuration of a chloride ion is: