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The $\Delta G^{\circ }$ for the Daniell Cell has been found to be - 212.3 kJ at ${25}^{\circ }C$. Calculate the equilibrium constant for the cell reaction.

Synthetic detergents are ___ effective in hard water than soaps.

Specific conductance of $0.1MC{H}_{3}COOHat{25}^{\circ }$ is $3.9\times {10}^{-4}oh{m}^{-1}c{m}^{-1}$. If ${\lambda }^{\infty }\left(H_3{O}^{+}\right)and{\lambda }^{\infty }\left(V{H}_{3}CO{O}^{-}\right)$ at ${25}^{\circ }C$ are 349.0 and 41.0 $oh{m}^{-1}c{m}^{2}mo{l}^{-1}$ respectively, degree of ionization of $C{H}_{3}COOH$ at the given concentration is :

Name the operation (shown in the figure) involved during the purification of water which is used for preparing solutions for medicinal purposes.

If the Acid is strong and Base is weak. Will there be a neutralisation reaction?

Question 2
Tick the most suitable answer.
The water holding capacity is the highest in
(i) sandy soil
(ii) clayey soil
(iii) loamy soil
(iv) a mixture of sand and loam

Why Punjab has high productivity of crops?

Which one of the following statements about the line emission spectrum for atomic hydrogen is incorrect?

What causes more severe burns, steam or boiling water?

The charge on electron was determined by

What will happen when a test tube containing oxygen gas is brought near a burning incense stick?

Given below are a few elements arranged in the order of increasing atomic masses.
Identify the pair of elements with similar properties according to Newlands’ Law of Octaves.

Which of the following non-metal is the good conductor of electricity?

There is a chemical nail polish remover called acetone. If you put acetone in the palm of your hand, you would feel your palm getting cold.

Why do you think that is?

Match the following according to the correct set of the pairs:
$\begin{array}{cccc}i& Wheat& a.& Loamysoils\\ ii& Paddy& b& Sandy-loamysoils\\ iii& Lentils& c& Clayeyandloamysoils\\ iv& Cotton& d& Clayeysoilwithlotsofhumus\end{array}$

Compare the properties of electron, proton and neutron.

In wool industry, often sorters get affected by sorter's disease. This disease is caused by

What is the rule that we need to follow while writing a covalent compound?

Following there are two examples. Can you name each on the basis of a chemical change or a physical change? [1 MARK]

Scouring is the process of ___ the sheared hair.

In the following passage, there are ten blanks, each of which has been numbered. Against each, five words are suggested, one of which fits the blank appropriately. Find out the appropriate word in each case.

Twenty years (1)_______ now, nearly 60% of the world’s population will live in urban areas. The impact of urbanization might not all be positive in India as urban expansion is happening at a much (2)_______ rate than infrastructure expansion. Sustainability issues need to be (3)_______ so that economic development is not at the (4)_______ of public health. Some urban services that ought to be in (5)_______ in a city like water, electricity, transport etc. need special consideration. TERI has put together a detailed report that (6)_______ sustainability in the provision of basic urban services in Indian cities. (7)_______ public transport is a major reason for the proliferation of private vehicles on the road. Respiratory illness in children living in urban areas is on the (8)_______ with more cases of Asthma being (9)_______ because of pollution. The future of cities of Indian dreams depends on (10)_______ we can build better cities today.

Find out the appropriate word which fits the 7th blank.

(i) Physical changes are easily reversible. (ii) Physical change does not produce new substance (iii) Physical change does not involve change in mass. Which of the following statement is correct?

Consider the zero order reaction
$R\to P$
Starting with 4 moles of R in a one litre container, after half an hour only 1 mole of R is left unreacted. The value of k for the reaction is:

The force that keeps the particles of matter together is :

Cotton is obtained from which part of the cotton plant?

The principle of 'difference in size' of particles is utilised in which of the following process?

What is deforestation and what is its impact on human life? [3 MARKS]

Which part of the year is generally preferred for shearing of sheep? How is shearing helpful to the sheep? [5 MARKS]

Ammonia is basic in nature. What can be its possible usage?

The layer of soil which is not rich in humus but rich in minerals is
___ (Fill in the blank).

Define horizon. Explain with the means of a figure. [3 MARKS]

Which amongst the following does not represent a polyatomic ion?

Question 12 (a)

State whether the following statements are True or False. If false, correct them.
(a) Silkworms are caterpillars of silk moth.

Sewage systems should not have which of the characteristics?

From where the plastics has came in all over the world?

What is carding of wool fibers

From which type of hair, can one obtain finer woollen fibres from sheep?

In electrolytic reduction of a nitroarene with 50% current efficiency, 20.50 g of the compound is reduced by $2\times 96500$ C of electric charge. The molar mass of the compound is :

The process of preparing food from water and carbon dioxide in the presence of chlorophyll and sunlight is called__.

The pressure exerted by the gas is because:

In the chemical reaction $C{l}_2+H_{2}S⟶2HCl+S$, the oxidation number of sulphur changes from

Loamy soil is rich in.