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A student working in a laboratory added some water to a syrupy liquid taken in a test tube. The test tube immediately cracked and the liquid escaped out. This liquid on reaction with the student's skin caused blisters. What can be the possible reason for this reaction?

The chemical name of main ore of iron is ___.

The odour of acetic acid resembles:

Difference between saturated and unsaturated compounds?

The number of oxygen atoms in $4.4\text{g}$ of $C{O}_2$ is:

The correct order of increasing bond angles in the following triatomic species is

1. 
   

   Fill in the blanks.

   
   

(i) The object to be electroplated is taken as ….……….. electrode.

(ii)One of the most common applications of the chemical effect of electric

current is …………………….

(iii)Small amount of mineral salt present naturally in water makes it a ………. ………………...of electricity.

(iv) Electroplating of………………. is done on objects like water taps and

cycle bell to give them a shiny appearance.

What is ten per cent law? Explain with an example.

Metals which can be extracted by smelting process is/are:

If volume of a gas at 0 degree C is V then the volume of the gas at 27.3 degree C is nearly

Give reasons for the following :

(a) Sodium hydrogen sulphate is not an acid but it dissolves in water to give hydrogen ions, according to the equation

$NaHS{O}_4\rightleftharpoons H^{+}+N{a}^{+}S{O}_4^{2-}$

(b) Anhydrous calcium chloride is used in a desiccator.

H and J were partners in a firm sharing profits in the ratio of their capitals. On 31st March, 2018 their Balance Sheet was as follows :

BALANCE SHEET OF H AND J

as on 31st March, 2018

$\begin{array}{cccc}\text{Liabilities}& \text{Amount}& \text{Assets}& \text{Amount}\\ & \left(\text{Rs}\right)& & \left(\text{Rs}\right)\\ \text{Creditors}& 1,50,000& \text{Bank}& 2,00,000\\ \text{Workmen Compensation Fund}& 3,00,000& \text{Debtors}& 3,40,000\\ \text{General Reserve}& 75,000& \text{Stock}& 1,50,000\\ \text{H's Current A/c}& 25,000& \text{Furniture}& 4,60,000\\ \text{Captial :}& & \text{Machinery}& 8,20,000\\ \text{H}& 10,00,000& \text{J's Current A/c}& 80,000\\ \text{J}& 5,00,000& & \\ & 20,50,000& & 20,50,000\end{array}$

On the above date the firm was dissolved.

(i) Debtors were realised at a discount of 5 $\%$. 50$\%$ of the stock was taken over by H at 10$\%$ less than the book value. Remaining stock was sold for Rs 65,000.

(ii) Furniture was taken over by J for Rs 1,35,000. Machinery was sold for Rs 7,40,000.

(iii) Creditors were paid in full.

(iv) Expenses on realisation Rs 8,000.

Prepare Realisation Account.

A. Give the balanced reaction for the heating of calcium carbonate.

B. Write the name of the type of the above reaction.

Covalent bonded are seen to have strong bonds within the next molecule, but intermolecular forces are small. Why?

Which of the following will be the most non metallic in nature?

Which among these will have the highest heat of neutralisation?

(a) What would be observed by adding a $5\%$ alkaline potassium permanganate solution drop by drop to some warm ethanol in a test-tube? Write the name of the compound formed during the chemical reaction. Also, write the chemical equation of the reaction which takes place.
(b) How would you distinguish experimentally between an alcohol and a carboxylic acid on the basis of a chemical property?

Write the IUPAC name of:

In any chemical reaction how could we have more products?

Calculate the number of molecules and the number of atoms present in 11.2L of Oxygen at N.T.P.

Identify biodegradable waste from the following :

peal of vegetable less and fruits, metalic cans, broken plastic toys, broken glass cover grass, paper, ball point pen refill.

When carbon dioxide combines with lime water it turns lime water

Which of the following do not give aldol reaction with dil. NaOH?

What happen when acid and base are reacted with each other .give any two reaction example ?