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When additional solute can be dissolved in a solution, this solution is known as________.

Choose the correct statement(s) that are proposed by Neils Bohr, regarding the model of an atom.

500 ml of 0.1 M KCl, 200 ml of 0.01 M $NaN{O}_3$ and 500 ml of 0.1 M $AgN{O}_3$ was mixed. What is the total number of moles of ions in solution?

5.0 g of a certain element X forms 10.0g of its oxide having the formula $X_4{O}_6$. The atomic mass of X is ?

If 100 grams of calcium carbonate (whether in the form of marble or chalk) are decomposed completely, then 56 grams of calcium oxide and 44 grams of carbon dioxide are obtained. Which law of chemical combination is illustrated by this statement?

1. 324.15

"Is malleable and ductile" best describes :

(a) a solution (b) a metal (c) a compound (d) a non-metal

Which of the following will not produce hydrogen gas?

Which of the following is a combination reaction ?

Carbon dioxide gas is liberated when HCl acid is added to

The number of elements in the 5th period is

Match the anionic species given in Column I that are present in the ore(s) given in Column II.
$\begin{array}{cc}\text{Column I}& \text{Column II}\\ \text{(A) Carbonate}& \text{(P) Siderite}\\ \text{(B) Sulphide}& \text{(Q) Malachite}\\ \text{(C) Hydroxide}& \text{(R) Bauxite}\\ \text{(D) Oxide}& \text{(S) Calamine}\\ & \text{(T) Argentite}\end{array}$

Define the different states of matter.

(a) Define matter. Give four examples of matter.

(b) What are the characteristics of matter?

What do you understand by formula unit mass and molecular mass? What is the difference between the two? [3 MARKS]

Name the negatively charged particle present in the atoms of all the elements.

The formula of the sample of an element X is $X_2(S{O}_4{)}_3$. The formula of nitride of element X will be:

Is it essential that oxidation and reduction must occur side by side in a chemical reaction ? Explain.

What do the following denote?

(i) $N$

(ii) $2N$

(iii) $N_2$

(iv) $2N_2$

Convert the following temperature to Celsius scale A) 400k

The Kelvin scale temperature is 0 K. What is the corresponding Celsius scale temperature ?

Calculate the amount of heat required to convert 1.00 kg of ice at -10°C at normal pressure to steam at 100°C. Specific heat capacity of ice = 2100 J kg⁻¹ K⁻¹ , latent heat of fusion of ice = 3.36 × 10⁵ J kg⁻¹ , specific heat capacity of water = 4200 J kg ⁻¹ K⁻¹ and latent heat of vaporization of water = 2.25 × 10⁶ J kg⁻¹

Why the electronic configration of pottasium is 2,8,8,1 if maximum electrons in m shell is 18

How can we name the element with atomic number 118 according to IUPAC nomenclature?

Define a mixture. Give two points of evidence to show that sugar solution is a mixture.

He was an English physicist who explained that radio waves were reflected by a layer of charged particles or ions high up in the atmosphere.

___ are formed when atoms lose or gain electrons.

Name one element, one compound and one mixture.

What makes oil so light to make it float on water?

The gases hydrogen, oxygen, carbon dioxide, sulphur dioxide and chlorine are arranged in order of their increasing relative molecular masses. Given 8 g of each gas at STP, which gas will contain the least number of molecules and which gas the most?

Carbon dioxide is heavier than oxyzen and nitrogen.explain

A vessel of capacity 600cm³ contains Hydrogen gas at a pressure of 304 cm of Hg. What will be the pressure of Hydrogen gas, when the vessel is connected to another vessel of the volume of 300cm³ capacity.

How will you separate a mixture of sodium chloride and sand ?

Identify the Arrhenius acids among the following:

1. NaCl 2. HCl 3. $Cu(OH{)}_2$ 4. NaOH

5. $H_{2}S{O}_4$ 6. $HN{O}_3$ 7. KOH

$H_2{O}_2$ is used as

The increasing order of the energy levels in an atom is _______ .

Question 16.1

Explain the following in terms of gain or loss of oxygen with two examples each:

Oxidation.

Tyler takes butter out of the refrigerator and keeps it on the table for sometime. He finds that the state of butter changes from solid to liquid.

The reversible process by which the state of butter can again be changed to solid is

Sarita wanted to separate dye from blue ink. Her teacher told her that heating the ink over a water bath will give her the results. What is the name of the process that her teacher suggested?

Classify the following as physical or chemical changes :

(i) Formation of curd from milk (ii) Condensation of steam

(iii) Growth of a plant (iv) Breaking of a glass tumbler

Sarath is observing a reaction between aluminium and sulphuric acid. Before the reaction, he weighed the contents of the flask and it was X g. After the reaction, aluminium sulphide and hydrogen are the products of this reaction. When he weighed the flask after the reaction, it was Y g (which is less than X g). Sarath declares that the law of conservation of mass is not valid. Select the correct option.