Explore topic-wise InterviewSolutions in .

What will happen if the industrial effluents are released into ponds and rivers?

We know that balancing of a chemical equation is entirely based on law of conservation of mass. However, the concept of Principle of Atom Conservation (POAC) can also be related to law of conservation of mass in a chemical reaction. So, POAC can also act as a technique for balancing a chemical equation. For example, for a reaction: $AB{C}_3\to AB+C_2$.
On applying POAC for A, B & C and relating the 3 equations, we get : $\frac{n_{AB{C}_3}}{2}=\frac{n_{AB}}{2}=\frac{n_{C_2}}{3}$
$(n_x:$ number of moles of X). Thus, the coefficients of $AB{C}_3,AB\&C_2$ in the balanced chemical equation will be 2, 2 & 3 respectively and the balanced chemical equation can be represented as: $2AB{C}_3\to 2AB+3C_2$.
Now, answer the following question: Which of the following relation is correct regarding the numerical coefficients p,q,r in the balanced chemical equation: $pA+q{B}_2\to r{A}_2{B}_5$

• What is the colour of the clouds that bring us rain?


• Do you like to sing and dance in the rain?


• What keeps you dry in the rain?

You have hydrochloric acid in a beaker. Which one of the following will you use to perform the experiment of neutralisation?

Which among the following is an example of reversible change?

What are polyatomic ions? Give four examples of polyatomic ions.

Choose the correct order for the given sequence.

A first century clay sturdy pot

Question 6:

How can you change the state of matters?

This is an example of which change:-

Consider the following chemical equation for the combustion of methane ($C{H}_4$)

$C{H}_4+2O_2\to C{O}_2+2H_{2}O$

Methods for prevention of corrosion

Which of the following exhibit the physical property of sonority (being sonorous)?

What is rigidity

The half life of ${}_{58}Co$ is $72$ days. Its average life (in days) is,

Statement (S): Both graphite and copper are good conductors of electricity yet only copper is used to make electric wires.

Reason (R): Copper is cheaper than graphite.

Explain whether the given statement(S) is true and the given reason(R) is the correct justification of the statement(S).

The type of soil suitable for growing paddy is?

Which of the following properties make metals the best choice to be used in electroplating?

Which phenomenon is observed when sunlight passes through the canopy of a dense forest?

List any three human activities that you think would lead to air pollution.

Name the two essential conditions for rusting. [2 MARKS]

As we know, water is one of the most essential substance for the existence of life. A large part of the body weight of all living beings is made up of _____.

For the reaction given below:

$A\stackrel{c}{⟶}B$

Select the correct statement from the following.

In Arrhenius eauation for a certain reaction, the values of A and $E_a$ (activation energy) are $4\times {10}^{13}se{c}^{-1}$ and 98.6 kJ $mo{l}^{-1}$ respectively. If the reaction is of first order, at what temperature will its half life period be 10 minutes ?

The atomicity of oxygen is 2. What does it mean?

Identify the correct pairs of gases and their corresponding sources.

A solution with osmotic pressure π1 is separated from another solution of osmotic pressure π2 by spm, solvent flows from π1->π2, then

(1) π1 > π2

(2) π1 < π2

(3) solutions are isotonic

(4) solutions are ideal

The units of temperature coefficient ​of cell reaction​ are:

Here

V is volt

K is kelvin

C is coulomb

Identify the sublimable substances in the room.

$100c{m}_3$ of 1 M $C{H}_{3}COOH$ was mixed with $100c{m}_3$ of 2M $C{H}_{3}OH$ to form an ester. The change in the intial rate if each solution is diluted with equal volume of water would be

How is the electrical conductance of a conductor relates with length and area of cross section of the conductor?

where,

$G$ is conductance

$l$ is length of the conductor

$A$ is area of cross section of the conductor

$\kappa$ is conductivity

Question 12

Look at the given reaction.
Hydrochloric acid + Sodium hydroxide (base) $⟹$ Sodium chloride (salt) +Water
Sodium chloride formed in this reaction remains in solution form. Can we get solid sodium chloride from the solution? Suggest a method (if any).

Consider the chemical reaction:

$N_2\left(g\right)+3H_2\left(g\right)\to 2N{H}_3\left(g\right)$.

The overall rate of this reaction can be expressed in terms of time derivative of concentration of $N_2\left(g\right)$, $H_2$, or $N{H}_3\left(g\right)$.

Identify the correct relationship among the given rate expressions.

Which acid is present in proteins? [1 MARK]

Minamata disease is a pollution-related disease, which is caused due to:

Question 9

Reeling of silk is
(a) a process of making silk reels
(b) the spinning of silk fibres
(c) the weaving of silk cloth
(d) the process of taking silk threads from a cocoon

Question 4

Read the following statements with reference to soil.

(i) Weathering is a very fast process of soil formation,
(ii) Percolation of water is faster in sandy soils.
(iii) Loamy soil contains only sand and clay.
(iv) Topsoil contains the maximum amount of humus.

Choose the correct statements from the above
(a) (ii) and (iv)
(b) (i) and (iii)
(c) (ii) and (iii)
(d) (i) and (ii)