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Which one of the following is not a property of gases?

Which of the below has second highest percentage by mass of nitrogen?

An atom has 26 electrons and its atomic weight is 56. The number of neutrons in the nucleus of the atom will be

Explain how impure copper sulphate can be purified by crystallization.

What is/are the drawbacks of Newland’s Law of Octaves?

What is the binding force between molecules of a substance in a gas under ordinary conditions of temperature and pressure

Crystals of a substance change their colour on heating but regain it after sometime,when they cooldown .

a) name one such substance.

b) explain the phenomena involved.

What is the melting point and freezing point of the blood in our body?

Valency of hydrogen is 1 and that of sulphur is 2. What should be the formula of hydrogen sulphide?

The temperature of a fixed mass of gas increase from 100k to 400k. What will happen to its volume?

If normal ice had been kept in place of the dry ice, and exposed to room temperature for a few minutes, then it would result in the

The purpose of liquefying the ammonia produced in the Haber’s process to separate hydrogen from uncombined nitrogen and hydrogen.

When we put Cuso4 in water after some time we find the solution turns blue . why? Also on heating it what change will occur?

am i right in saying that variable composition is a composition in which there is more than one single component present.

The following diagram showing part of the periodic table in which atomic radii of elements of third period are given. Which of the following elements has the lowest atomic radii?

Which of the following are the applications of hydrocarbons?

Explain fractional atomic mass. What is the fractional mass of chlorine ?

Raghav dissolved sugar in the warm water. Which kind of change is this :

100 ml mixture of Co and $C{O}_2$ is mixed with 30 ml of oxygen and sparked in a eudiometer tube. The residual gas after treatment with aqueous KOH has a volume of 10 ml which remains unchanged when treated with alkaline pyrogallol. If all the volumes are under the same conditions, point out the correct option(s).

Noble gases did not find a place in Newland's Octaves. Explain. [2 MARKS]

Question 1
Define the atomic mass unit.

I don't understand how melting point = freezing point.

For example, if liquid water freezes at 0 °C how can ice also melts at 0 °C?

What is the difference between solutions and colloids ?

What is the molecular mass of $CC{l}_4$?
Given the atomic mass of $C=12u$ and $Cl=35.5u$

Question 3 (d)
Give reasons
(d) We can easily move our hand in air but to do the same through a solid block of wood we need a karate expert.

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

An element forms two oxides of 2.9 g and 2.25 g of these oxides each was found to contain 1.12 L of $O_2$ at STP. What is the simple ratio if it obeys law of multiple proportions?

100 ml of 1M NaOH and 100ml of $Xg{L}^{-1}{H}_{2}S{O}_4$, both being at the same temperature, are mixed. The highest rise in temperature would occur when X is ?

Question 44
Fill in the blanks

(a) In a chemical reaction, the sum of the masses of the reactants and products remains unchanged. This is called ___.

(b) A group of atoms carrying a fixed charge on them is called ___.

(c) The formula unit mass of $C{a}_3(P{O}_4{)}_2$ is ____.

(d) Formula of sodium carbonate is ___ and that of ammonium sulphate is ____.

The number of molecules in 16.0g of oxygen is

Rohan added water to milk and he observed that it gets mixed properly, which of the following statements

supports his observation?

Which of the following mixture cannot be separated by using water as the solvent ?

(a) copper sulphate and sand (b) sand and potash alum

(c) sand and sulphur (d) sugar and sand

Increase in amount of $C{O}_2$ in air results in:

Potassium when heated strongly in oxygen, it forms

Which atomic model is also called plum pudding model?

Which metal is preferred for preparation of hydrogen

(i) from water ?

(ii) from acid ?

(a) 2, 8, 2
(b) 2, 8, 1
(c) 2, 8, 7
(d) 2, 1

In Bohr series of lines of hydrogen spectrum, the third line from the red end corresponds to which one of the following inner-orbit jump of the electron in a hydrogen atom

If three neutrons are added to the nuclei of ${}_{92}{U}^{235}$, the new nucleus will have an atomic number of

Question 9
Which of the following are not ionic compounds?
(i) $\text{KCl}$
(ii) $\text{HCl}$
(iii) ${\text{CCl}}_4$
(iv) $\text{NaCl}$

(a) (i) and (ii)
(b) (ii) and (iii)
(c) (iii) and (iv)
(d) (i) and (iii)

Can sub-atomic particles exist freely?

Define cathode ray expirement

In what ways are materials different from each other ? Is there any similarity between these materials ?