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Why is biogas also called gobar gas?

The formation of copper oxide from copper in the presence of oxygen is an ____________ reaction.

$2Cu+O_2\to 2CuO$

Aquatic species are more comfortable in cold water because __________

${ZnCO}_3$ + $HCl$ $\to$ ${ZnCl}_2$ + Y + X;

What is X and Y respectively?

Ethylene can be obtained by dehydration of with concentrated $H_2{\mathrm{SO}}_4$ at $160-170°C$.

What do you understand by redox reactions ? Explain oxidation and reduction in terms of loss or gain of electrons.

Find the number of H atoms in $9.033\times {10}^{23}$ molecules of water.

The mass ratio of hydrogen to oxygen in water is :

Acids turn blue litmus:

1. 2

Assertion : Salts like $KCl,KN{O}_3$ i.e., inert electrolytes are used in salt bridge.

Reason : An inert electrolyte can easily be filled in the U-tube.

You are given a hammer, a battery, a bulb, wires and a switch.
How could you use them to distinguish between samples of metals and non-metals? [3 MARKS]

Which of the following pair are functional isomers and also respond to aldol condensation?

The bottoms of cooking vessels get blackened when used on gas/kerosene stove on due to

Which of the following metals should be chosen to react with $CuS{O}_4$ solution to make its color disappear?

When a copper strip is placed in a solution of silver nitrate, what happens to the colour of the solution?

What is the correct sequence

1. Newland's law of octaves

2. Law of triads.

3. Modern periodic table.

4. Mendeleev's periodic table.

$Cu(OH{)}_2+HCl\to X+Y$

What is X and Y respectively?

Which of these metals exist as liquid at room temperature?

Which one is not observed when aluminium is added to solution of copper sulphate?

Explain why

(a) Only all-glass apparatus should be used for the preparation of nitric acid by heating concentrated sulphuric acid and potassium nitrate.

(b) Nitric acid is kept in a reagent bottle for a long time.

On the passage of excess of Ammonia, colourless Nessler's reagent turns to which colour?

The second ionization potential of an element M is the energy required to

What are carboxylic acids? Give their general formula.

Anything that produces energy is its source. We get energy from the food we eat. Can food be termed as a source of energy?

Among $A{l}_2{O}_3,Si{O}_2,P_2{O}_3,andS{O}_3$ , the correct order of acid strength is:

' Every substance has an intrinsic property of electricity, which manifested as an electric fluid' - Explain

What is the definition of valency?

Electricity passed through a solution of alcl3 ,13.5gm al is deposited no.of Faraday must be

The hydrogen ion concentration of a solution is 0.005M. What is the pH of this solution?

What are the functional groups present in the following compound?

'electrolytic conductivity is a property of electrovalent compound' explain this line.

How to calculate or figure out the hybridization state, i.e. sp³ or sp², etc?

Explain in detail with some examples.

Both sodium and ammonium hydroxide are used in analytical chemistry for identifying __[cations/anions] of salts.

What kind of reaction is slaking of lime?

What do you understand by the terms: solute and solvent? Identify the solute and solvent in the following solutions:
(i) Sugar solution (ii) Soft drinks.

Which of the following is unsaturated compound?

Which of the following basic solution will have the highest pH?

Isobars differ in____.

In which of the following is the angle between the two covalent bonds greatest?