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According to Rutherford's atomic model, if a large play ground represents an atomic size, which of the following objects best represent the size of a nucleus?

Identify alkanes in the given options.

Work out the formula for magnesium hydrogencarbonate.

What is Pauling approach and mullikens approach and Allred Rochow scale

Which of the following properties do not apply to an element?

The part of an atom where nearly the entire mass of an atom is concentrated is:

What is the absolute mass and charge of an electron?

Which of the following graphs represent Boyle's law

Cl2 stands for:

What is meant by chemical formula? Calculate the number of aluminium ions present in 0.051 g of aluminium oxide.
(Hint: The mass of an ion is the same as that of an atom of the same element. Atomic mass of Al = 27 u)
[5 MARKS]

What is the concentration of a solution which contains 16 g of urea in 120 g of solution?

Question 15
The non S I and S I units of some physical quantities are given in column A and column B respectively. Match the units belonging to the same physical quantity.
$\begin{array}{cc}\text{(A)}& \text{(B)}\\ \text{(a) degree Celsius}& \text{(i) kilogram}\\ \text{(b) centimeter}& \text{(ii) pascal}\\ \text{(c) gram per centimeter cube}& \text{(iii) metre}\\ \text{(d) bar}& \text{(iv) Kelvin}\\ \text{(e) milligram}& (\text{v) kilogram per metre cube}\end{array}$

1. 2

Write the value of :
(a) standard temperature in:
(i) ${}^{\circ }C$ (ii) K
(b) Standard pressure in:

(i) atm (ii) mm Hg (iii) cm Hg (iv) torr

What are pH indicators?

Question 45
Complete the following cross word puzzle (Figure 5.1)

Across: (1) An element with atomic number 12.

(3) Metal used in making cans and member of Group 14

(4) A lustrous non-metal which has 7 electrons in its outermost shell.

Down: (2) Highly reactive and soft metal which imparts yellow colour when subjected to flame and is kept in kerosene.

(5) The first element of second Period

(6) An element which is used in making fluorescent bulbs and is second member of Group 18 in the Modern Periodic Table

(7) A radioactive element which is the last member of halogen family.

(8) Metal which is an important constituent of steel and forms rust when exposed to moist air.

(9) The first metalloid in Modern Periodic Table whose fibres are used in making bullet-proof vests

Which one of the following molecules contains no $\pi$ bond?

Describe the characteristics of solid liquid and gas.

Balancing:

◆Give a balanced equations for reactions involving evolution of a gas on addition of dilute acid to--

a】Sodium Sulphate b】Calcium Carbonate

In what respect does hydrogen differ from :

(i) alkali metals (ii) halogens ?

Why some solids diffuse in liquids but not in gases and some solids diffuse in gases but not in liquids

Which of the following metals evolves hydrogen on reacting with cold dilute $HN{O}_3$?

Which form of iodine is used for the treatment of goitre?

What is the mole fraction of the solute in a 1.00 m aqueous solution?

Which of the following statements are true?

Statement 1: Metal oxides are also called basic oxides.
Statement 2: Metal oxides neutralize the effect of acids and release water, similar to the reaction of a base with an acid.

Is there any easiest way to remember the atomic number of the element in the periodic table?

What is atomic valency of caesium??

Which volume-temperature graph represents the behaviour of 1 mol of an ideal gas at constant pressure?

What is the empirical formula of $C_6{H}_{12}{O}_6$?

Who among the following established the laws of constant proportions?

Write the relation between nanometre and meter.

What is the chemical name of dry ice ?

On suffering from high fever which will lower your body temperature more - ice at 0 degree or water at 0 degree and why ?

Question 17
Arrange the following elements in the order of their decreasing metallic character
Na, Si, Cl, Mg, Al

(a) Cl > Si >Al > Mg >Na
(b) Na >Mg >Al >Si > Cl
(c) Na > Al > Mg > Cl > Si
(d) Al > Na> Si > Ca> Mg

Whichof the two diffuses slower : nitrogen dioxide into air or copper sulphate into water and why?

Is water and sugar physical change or Lt is not so why?

The non-metal which is a liquid at room temperature is ___ .

Isotopes are those atoms having same atomic number but different mass number. Which of the following is not the property of isotopes?

The chemical formula of silicon oxide is:

In the purification of NaCl, an impure solution is saturated with HCl gas. The principle involved is: