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Which property of the substance does not help in identifying any chemical reaction?

Distinguish by adding : Sodium hydroxide solution and ammonium hydroxide solution to
(a) Calcium salt solution and lead salt solution.
(b) Lead salt solution and zinc salt solution.
(c) Copper salt solution and ferrous salt solution.
(d) Fe(II) salt solution and Fe(III) salt solution.
(e) Ferrous nitrate and lead nitrate

The number of moles of water present in a spherical water droplets of radius 1.0 cm is:
[Given: density of water in the droplet
$=1.0gc{m}^{-3}$]

Arrange the following elements in increasing order of their atomic radii :

Li, Be, F, N

Calculate:

a) the gram molecular mass of chlorine if 308 cm cube of it at STP weighs 0.979 grams

B) the volume of 4 gram of H2 at 4 atmospheres.

C) the mass of oxygen in 2.2 litres of carbon dioxide at STP

(a) Name the gas evolved when dilute hydrochloric acid is added to:

(i) Zinc metal

(ii) Calcium carbonate

(iii) Sodium sulphite

(iv) Lead (II) sulphide

(v) Magnesium bicarbonate

(vi) Potassium bisulphite

(b) Give a balanced equation for each of the above reaction.

The $p{K}_b$ of dimethylamine and $p{K}_a$ of acetic acid are $3.27and4.77$ respectively at $T\left(K\right)$. The correct option for the pH of dimethylammonium acetate solution is :

A mixture of hydrogen and chlorine occupting $36c{m}^3$
was exploded. On shaking it with water, $4c{m}^3$ fo hydrogen was left behind. Find the composition of the mixture.

$SnC{l}_4+2HCl\to A$

$A+2N{H}_{4}Cl\to B$

A and B ?

If the ionisation energy of a compound is 320kJ/mol then what is the electron affinity of the same compound?

Mendeleev predicted the existence of certain elements not known at that time and named two of them as eka-aluminium, and eka-silicon.

(a) Name the element which has taken the place of (i) eka-aluminium and (ii) eka-silicon

(b) Mention the period/periods of these elements in the modern periodic table.

(c) Write the group/groups of these elements in the modern periodic table.

(d) Classify these elements as metals, non-metals or metalloids.

(e) How many valence electrons are present in the atoms of each of these elements?

State the method of preparation of ethanol :
(a) by hydrolysis of ethene,
(b) by hydrolysis of ethyl bromide.

M/s Lokesh Fabrics purchased a Textile Machine on April 1, 2001, for Rs 1,00,000. On July 1, 2002, another machine costing Rs 2,50,000 was purchased. The machine purchased on April 1, 2001, was sold for Rs 25,000 on October 1, 2005. The company charges depreciation $15\%$ per annum on the straight-line method. Prepare Machinery account and Machinery disposal account for the year ended March 31, 2006.

Name the enzyme which converts: [3 MARKS]
1. Milk into curd (yogurt)
2. Cane sugar into glucose and fructose
3. Glucose into ethanol.

Consider the three allotropes of carbon :



(i) Diamond

(ii) Graphite

(iii) Fullerenes ($C_{60}$)



The hybridisation state of C-atom in the three allotropes are respectively

One of the following used for removing permanent hardness of water

Choose the correct option:

The correct structure of $\text{4-methyl-5-methylenehept-2-ene}$ is: