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

A wooden table should be called a solid why?

a. What do you understand by the term chemical formula?

b. What information is given by the formula ${\mathrm{NH}}_3$?

Match the following:

Which of the following set of elements is written correctly in the order of their increasing metallic character?

You have one glass of water and some sugar and Sand. How will you create a homogeneous mixture?

Identify the catalyst 'y' used in the given reaction.

Reaction 1:
$C\left(redhotcoke\right)+\underset{\text{Water gas}}{H_{2}O}$(g) $\stackrel{1273K}{⟶}$ $CO\left(g\right)+H_2\left(g\right)$

Reaction 2: $CO\left(g\right)+H_2\left(g\right)+H_{2}O\left(g\right)$ $\stackrel{y\left(catalyst\right)}{⟶}C{O}_2\left(g\right)+2H_2\left(g\right)$

The approximate temperature of 27${}^{\circ }C$ in Kelvin is ___K.

1. 
   

   What is the principle of Centrifugation?

   
   


2. 
   

   What are the applications of Centrifugation?

   
   

Naturally occurring chlorine consists of two isotopes whose atomic weights are 35 and 37. The atomic weight of natural chlorine is 35.5, then what is the ratio of $C{l}^{35}toC{l}^{37}$?

Mass number is equal to:

Which of the following is not a simple oxide?

Question 30

The electronic configurations of three elements X, Y and Z are

X — 2, 8; Y — 2, 8, 7 and Z — 2, 8, 2. Which of the following is correct?

The smell of hot sizzling food reaches several metres away, but to get the smell from cold food, we have to go close. Which of the following reason best explains the given observation?

One of the following substances is neither a good conductor of electricity nor an insulator. This substance is ?

(a) chromium (b) germanium (c) gallium (d) potassium

Doctor advised to put a wet cloth on the forehead of Ankit .What problem does Ankit have and how will the wet cloth help it?

Which among the following formulae can be used for calculating the 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) $\frac{\text{mass of solvent}}{\text{volume of solution}}\times 100$

Oxidation states of the metal in the minerals hematite and magnetite, respectively, are:

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