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Arrange the molecules in the increasing order of molecular weight.

Answer the following questions: [3 MARKS]
1) What is the chemical name of baking soda?
2) What happens when vinegar reacts with baking soda? How can we say if it is a chemical or a physical change?

Which type of soil is best for growing plants and why? [3 MARKS]

Which compound is used as a catalyst in the process of decomposition of potassium chlorate to prepare oxygen?

Which compound is formed by the action of corrosion on copper?

Identify the following as weak or strong acid : citric acid, tarteric acid, acetic acid, maleic acid, tannic acid, ascorbic acid, oxalic acid, amino acid.

When hydrogen peroxide is mixed with liquid soap and catalyst potassium iodide is added, a foamy substance is formed by the rapid decomposition of hydrogen peroxide. Name the experiment.

__ is a process to convert wastewater; which is water no longer needed or suitable for its most recent use - into an effluent that can be either returned to the water cycle with minimal environmental issues or reused.

The process of evaporation of water from the aerial parts of plants especially in leaves is called as __.

Standard electrode potential data are useful for understanding the suitability of an oxidant in a redox Titration. Some half – cell reactions and their standard potential are given below:
$Mn{O}_4^{-}\left(aq\right)+8H^{+}\left(aq\right)+5e^{-}\to M{n}^{2+}\left(aq\right)+4H_{2}O\left(I\right);E^{\circ }=1.51V$
$C{r}_2{O}_7^{2-}\left(aq\right)+14H^{+}\left(aq\right)+6e^{-}\to 2C{r}^{3+}\left(aq\right)+7H_{2}O\left(I\right);E^{\circ }=1.38V$
$F{e}^{3+}\left(aq\right)+e^{-}\to F{e}^{2+}\left(aq\right);E^{\circ }=0.77V$
$C{l}_2\left(g\right)+2e^{-}\to 2C{l}^{-}\left(aq\right);E^{\circ }=1.40V$

Identify the only incorrect statement regarding the quantitative estimation of aqueous $Fe(N{O}_3{)}_2$.

What is the difference between fluids and liquids

Which of the following is/are not a characteristic of atom suggested by John Dalton?

i. An atom is the smallest particle which cannot be divided further into smaller particles.

ii. Atoms of all the different elements are identical.

iii. Atoms can neither be created nor be destroyed.

iv. Atoms take part in Chemical Reaction.

In neutralisation reaction, which of the following is/are produced?

What is the common name of Sodium bicarbonate?

Which of the following is an abiotic factor?

How will you separate a mixture containing kerosene and petrol which are miscible with each other?

The process by which ammonia is synthetically manufactured is___.

Lavoisier gave the law that stated

By observing the mentioned events below, which of the following shows chemical change?
(i) Heating iodine changes the colour from bluish black to purple
(ii) Mixing ammonia and hydrogen chloride gases gives fumes containing a white powdery substance
(iii) Mixing an acid and a base solution raises the temperature.
(iv) Mixing ferrous sulphide and hydrochloric acid gives off a gas with a rotten egg smell

How plants do photosynthesis and respiration at the same time in the day as in respiration,oxygen is inhaled and carbon dioxide is exhaled and in photosynthesis,carbon dioxide is inhaled and oxygen is exhaled.So they are opposite.So how do they carry out both the processess at the same time?

Match the following:

$\begin{array}{cccc}\left(i\right)& \text{Can have variable composition}\text{of constituent elements}& \left(A\right)& \text{Compound}\\ \left(ii\right)& \text{Is new substance formed due to}\text{reaction of two constituent elements}& \left(B\right)& \text{Mixture}\\ \left(iii\right)& \text{Constituent elements can be separated easily}& \left(C\right)& \text{Element}\\ \left(iv\right)& \text{Can be separated only by chemical or}\text{electrochemical reactions}& & \\ \left(v\right)& \text{Composition is always fixed}& & \\ \left(vi\right)& \text{Shows properties of constituent elements}& & \end{array}$

The correct pairs are:-

Rearrange the jumbled letter to obtain name of a indicator. HCINA ORSE

The acid which is used in pickles is

What is the space between the particles of matter called

Explain Antoine lavoisier experiment on Oxygen

Chanakya on his way home saw a farmer digging the soil. He observed that the digging tool had an iron blade fixed to a wooden handle. He wondered how the iron blade was fixed to the wooden handle even though the iron ring is smaller than the wooden handle. How do you think this was achieved?

In which of the following processes do the change in the states of matter is endothermic?
A. Boiling
B. Sublimation
C. Condensation
D. Melting

Question 19

In towns and cities, generally, the borewells have to be dug very deep to get water as compared to bore wells dug in villages. Give suitable reasons.

We know that the items which taste sour are acidic ,so why lemon juice don't harm having sour taste?

What is the purpose of providing oxidation numbers to reactants and products?

(a) Ammonia is found in many household products such as window cleaners. What is its nature? What is the colour change of a litmus paper when it is dipped in ammonia solution?

(b) Blue litmus paper is dipped in a solution. It remains blue. What is the nature of the solution? Explain. [2 MARKS]

Relative humidity is a measure of

When lead nitrate reacts with potassium iodide, yellow precipitate of

Which of the following is not a type of silk?

Which of the following solution will change the color of blue hibiscus paper from blue to red?

Crystals of copper sulphate are prepared by the method of:

Basic radicals have a positive charge and are also called ___.

The decomposition of dimethyl ether leads to the formation of $C{H}_4,H_2$ and CO and the reaction rate is given
By rate = $K[C{H}_{3}OC{H}_3{]}^{\frac{3}{2}}$
The rate of reaction is followed by increase in pressure in a closed vessel and the rate can be expressed in terms of the partial pressure of dimethyl ether i.e, Rate = $K(p_C{H}_{3}OC{H}_3{)}^{\frac{3}{2}}$
If pressure is measured in bar and time in minutes, the units of rate constant are

Pure hydrogen gas burns with a:-

Electrolyte can conduct electricity because

Why do some plants and fruits taste sour? [2 MARKS]

In a biogas plant, the cow dung and water are mixed in equal proportion to prepare:

What happens when [5 MARKS]

a) A red litmus paper is dipped in a solution of calcium hydroxide.

b) A red litmus paper is dipped in a solution of sodium chloride.

c) A blue litmus paper is dipped in lemon juice.

d) A red litmus paper is dipped in distilled water.

e) A solution of sodium hydroxide is added to turmeric.

What is the principle behind the construction of long form of periodic table?

Are normal salts and the salts which we get by mixing acid and base same? why?