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Name the gas evolved when dilute HCl reacts with sodium hydrogen carbonate. How is it recognised?

One of the following substances is not added to make denatured alcohol. This is :

(a) methyl alcohol (b) copper sulphate (c) chloroform (d) pyridine

$Mn{O}_2+4HCl\to MnC{l}_2+2H_{2}O+C{l}_2$

In the above reaction, Mn is reduced and Cl is oxidised. The reactions in which both oxidation and reduction takes place is called __________ reaction.

What is the difference between atoms and molecules?

A and B share profits and losses in the ratio of 3 : 2. They have decided to dissolve the firm. Assets and external liabilities have been transferred to Realisation A/c. Pass the journal entries to effect the following :

(a) Bank Loan of Rs. 12,000 is paid off.

(b) A was to bear all expenses of realisation for which he is given a commission of Rs.. 400.

(c) Deferred Advertisement Expenditure A/c appeared in the books at Rs. 28,000.

(d) Stock worth Rs. 1,600 was taken over by B at Rs. 1,200.

(e) An unrecorded computer realised Rs. 7,000.

(f) There was an outstanding bill of repairs for Rs. 2000, which was paid off.

The cause of the fireworks disaster at the Puttingal Devi temple near Kollam was possibly due to potassium chlorate. The Potassium chlorate can be used:
1. as a reducing agent,
2. as a disinfectant,
3. in safety matches,
4. in cultivation
5. in pyrotechnics.

An element belongs to the 3rd period and Group IIIA (13) of the periodic table.State:

(a) the number of valence electrons,

(b) the valency,

(c) if it is a metal or non-metal ?

(d) the name of the element.

Why does a transparent object allow s light to pass through and opaque object doesn't might be some things in there molecules which Abbsob light and and give object the color what is that thing ? because that thing is present in opaque object thus light cant pass and absent in transparent so light can pass.

Nitric acid is a ___.

When a colourless compound X reacts with caustic soda, white precipitate of metal hydroxide Y is formed along with sodium nitrate. What is X?

Select the meaning of the given phrases/idioms: To end in smoke.

Select the metalloid element from the given group of elements.

The following table shows the positions of six elements A, B, C,D,E and F in the modern periodic table

Which element is a metal with valency two?

What is the effect of dilution on specific, molar, equivalent conductance?

Plaster of Paris is prepared by heating one of the following to a temperature of ${100}^{o}C$. This is :

(a) $CaS{O}_{3}2H_{2}O$

(b) $CaC{l}_{2}2H_{2}O$

(c) $CaC{O}_3.2H_{2}O$

(d) $CaS{O}_4.2H_{2}O$

Which of the following is not a producer?

(a) grass (b) zooplankton (c) phytoplank ton (d) paddy

A greenish layer appears on the copper utensils if they are not cleaned for a few days. Give reason. [2 MARKS]

What do you understand by $p^H$values of 4 and 10 respec tively. Which one of these two will give a pink colour with phenolphthalein indicator ?

Calculate hte number of moles of :
(a) $C{O}_2$ which contain 8.00 g of $O_2$
(b)methane in 0.80 g of methane.

What are the advantages of preparing solutions?

Magnese metal is extracted from manganese dioxide by a reduction process by making use of :
(a) carbon (b) hydrogen (c) electrolysis (d) aluminium

Uses of decomposition reaction.

(a) What are esters? How are they formed? (b) Write two uses of esters?

Which of the following is the rate-determining step of the idustrial preparation of sulphuric acid?

The molecular mass of any two homologues differ by?

What is froth floatition ?

A student added acetic acid to test tubes I, II, III and IV containing the labeled substance and then brought a burning splinter near the mouth of each test tube.

The splinter would be extinguished when brought near the mouth of test tube:

Will micelles be formed in other solvents like ethanol?

Formation of nitric oxide from nitrogen and oxygen is a _______ reaction.

A student takes about 6 ml of distilled water in each of the four test tubes, P, Q, R and S. He then dissolved an equal amount of four different salts namely, sodium chloride in 'P' potassium chloride in 'Q', calcium chloride in 'R' and magnesium chloride in 'S'. Next, he then adds 10 drops of soap solution to each test tube shakes its contents. The test tubes in which scum (insoluble substance) is formed with soap are:

In the given experiment, on heating lead nitrate powder in a boiling test tube, we observe brown fumes. The emission of brown coloured fumes is due to formation of:

Which of the following components of municipal solid wastes can be recycled?

Detergents are sodium or potassium salts of long chain __________.

A covalent compound which in aqueous state conducts electricity.

CCl_{​​​​4}

CS_{​​​​​2}

_NH​​​​_​3

_C2H4

How is bicarbonate formed?

What happens when ethene burns in the air if the supply of air is in excess?