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Which of the following will have highest value of bond enthalpy?

The Fractional atomic mass of ${}_{17}^{35}Cl$ and ${}_{17}^{37}Cl$ present in the ratio 3:1 is:

The phenomenon by which an element exists in two or more different crystalline or amorphous forms is called ___.

15g of a substance A combines with 20g of a substance B to give 35 g of product C. The law followed in this reaction is:

What will you observe when a mixture of iodine and salt is heated in a china dish?

An atom of an element X may be written as ${}_4^9\text{X}$.
(a) What does the figure 9 indicate?
(b) What does the figure 4 indicate?
(c) What is the number of protons in atom X?
(d) What is the number of neutrons in atom X?
(e) What is the number of electrons in atom X?
(f) How many electrons are there in the outermost shell of an atom of element X?
(g) Write the symbol of ion formed by an atom of element X.

What is the difference between dehydrating and drying agents.

3 grams of carbon is burnt completely in 8 gram of Oxygen and 11 gram of carbon dioxide is produced the mass of carbon dioxide formed when 9 gram of carbon burns in 50 gram of oxygen is

Question 3 (c)
Give reasons
(c).A wooden table should be called a solid.

How many states of matter are there?

When alpha particles are sent through a thin metal foil, only one out of ten thousand rebounded. This observation led to the conclusion that:

The difference between 100 moles of sodium and sodium ions is 5.48002g. Calculate the mass of an electron.

An neutral element A has 3 electrons, the atomic number of an element is _______ .

Explain the terms :

(a) Solution

(b) Solute

(c) Solvent

The following picture represents which model of an atom?

Formation of a brown ring at a junction of two liquids in the brown ring test confirms the presence of :

Which of the following formula can be used for calculating concentration?

(i) $\frac{\text{mass of solute}}{\text{mass of solution}}\times 100$

(ii) $\frac{\text{mass of solute}}{\text{mass of solute + solvent}}\times 100$

(iii) $\frac{\text{mass of solvent}}{\text{mass of solution}}\times 100$

(iv) $\frac{\text{mass of solvent}}{\text{mass of solute + solvent}}\times 100$

(v) $\frac{\text{mass of solute}}{\text{volume of solution}}\times 100$

(vi) $\frac{\text{mass of solvent}}{\text{volume of solution}}\times 100$

___ is insoluble in cold water but soluble in excess of ammonia solution.

For any substance why does the temperature remain constant during the change of state.

Which of the following relations for expressing volume of a sample is not correct

Which of the following is/are correct regarding isotopes and isobars?

Use the following numbers to form a multiplication sentence: $6,8$ and $48$.

Identify the homologous series among the following:
1. $HCOOH$
2. $C{H}_{3}COOH$
3. $C_2{H}_6$
4. $C_2{H}_{5}COOH$
5. Propanone

Name the process which is used in milk dairies to separate cream from milk.

Calculate the volume of dry air at S.T.P. that occupies $28c{m}^3$ at ${14}^{\circ }C$ and 750 mm Hg pressure when saturated with water vapour. The vapour pressure of water at ${14}^{\circ }C$ is 12 mm Hg.

Consider the following two situations, in which case the level of water (same volume) in the beaker will be higher?

Situation 1: Water in a beaker

Situation 2: Sponge in the water beaker

Assuming complete ionisation, same moles of which of the following compounds will require the least amount of acidified $KMn{O}_4$ for complete oxidation?

$AgN{O}_3\left(aq\right)$ was added to an aqueous KCl solution gradually and the conductivity of the solution was measured. The plot of conductance (A) versus the volume of $AgN{O}_3$ is

(IIT-JEE, 2011)

What do you understand by the term 'latent heat' ?What are the two types of latent heat ?

2 ml of dettol is added to a beaker containing 500 ml of water and stirred. State four observations that you make. [2 MARKS]

Chemical formula of a compound is A₂B₃. The valency of A is _______ .

The energy absorbed or released when a substance changes its physical state can be termed as_________.

Explain physical change and chemical change and physical properties and chemical properties.(explain briefly)

Which of the following factors are responsible for the change in state of solid carbon dioxide when kept exposed to air?

(i) increase in pressure (ii) increase in temperature

(iii) decrease in pressure (iv) decrease in temperature

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

What is the purpose of adding alum to water during the process of purification?

Find the symbol of an element X, if its mass number is A and atomic number is Z respectively.