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Biotic and abiotic factors are related to each other in an ___.

It is given that Bayer's process is employed. Which of the following steps are observed in this process?

Write the structure of the functional group that belongs to the following classes: [5 MARKS]
(Any Five)
(i) Alcohol
(ii) Aldehyde

(iii) Ketone
(iv) Carboxylic acid
(v) Ester
(vi) Ether

Ecological pyramids were developed by which of these following?

Which of the following statements are not true with respect to the production of iron?

Only one type of hydrocarbon is formed by wurtz reaction of

An element ‘X’ has mass number = 27. If the no. of electrons is given as 13, the no. of neutrons will be ___ .

(Assume that atom is neutral)

According to Arrhenius theory, which of the given options is correct?

(a) Write down the electron arrangement in (i) a magnesium atom, and (ii) a chloring atom.
(b) How many electrons are there in the alence shell of (i) a magnesium atom, and (ii) a chlorine atom?
(c) Show the formation of magnesium chloride from magnesium and chlorine by the transfer of leectrons.
(d) State wheter magnesium chloride will conduct electricity or not. Give reason for your answer.
(e) Why are covalent compounds generally poor conductors of electricity?

Which of the following pairs have both the members from the same group of periodic table?

Acetic acid solution turns:

What is the difference between quick line and lime water and what happens when excess CO2 is added to lime water?

What is affinity?

What is the smilarisimil and differences between Atom , Ion and molecules with their respective defination?

Name a base which is not alkali.

Explain reaction of metal oxides with acids and bases.

The atomic number of an element X is 16. The symbol of ion formed by an atom of the symbol of ion formed by an atom of this element will be:
(a) $X^{3-}$

(b) $X_{2+}$

(c) $X^{2-}$

(d) $X^{-}$

One of the following does not inject an acidic liquid into the skin through its sting. that is:

(a) honey bee

(b) ant

(c) wasp

(d) nettle leaf hair

What provides the energy which then flows through a food chain?

(a) glucose (b) oxygen (c) respiration (d) sunlight

A molten melt that catches fire in air and water and gives off white flame is ___________.

What happens when: (Write chemical reactions as well)
(i) A pinch of sodium hydrogen carbonate is added to ethanoic acid.
(ii) Ethanol is oxidised with acidified potassium dichromate.

Pure sulphuric acid is a ___ of electricity.

A metal sulphate has the formula MSO4. A cloride of the same metal will have the formula

(A)M2cl3

(B)M2cl

(C)Mcl2

(D)Mcl

In order to get dry ammonia, the gas is passed through______.

__ is a process by which metals containing impurities are purified electrolytically to give a pure metal.

Define:

1) Oxidation reaction

2) reduction reaction

3) neutralization reaction

4) precipitation reaction

What will be the colour change when phenolphthalein is added to ammonium hydroxide?

NaCl + AgNO₃ → AgCl + NaNO₃ is an example of:

The noble gases are unreactive because ___ .

(a) The pH of a cold drink is 5. What will be its action on blue and red litmus solutions?

(b) The pH values of three acids A, B and C having equal molar concentrations are 5.0, 2.8 and 3.5 respectively. Arrange these acids in the increasing order of acid strengths.

Thermal decomposition of $HN{O}_3$ releases yellow-brown coloured fumes due to the formation of gas.

In water, oxygen has a slight negative charge and hydrogen has a slight positive charge. So what type of bond does water have?

Which catalyst(s) is(are) used for the industrial preparation of sulphuric acid?

The ability of carbon atom to link with another carbon atoms to form long carbon chains is known as __.

Question 10
The main constituent of biogas is

How many no.of mole are there in reactants and products side in this CH4 + 2O2 gives CO2 + 2H2O

Why single bond carbon compound called saturated carbon compound

The pH of the above reaction will be___.

What happens when iron nails are put into copper sulphate solution?

$C{H}_3-CHO+HCN\to X\stackrel{H_3{O}^{+}}{\to }Y\stackrel{RedP+HI}{\to }Z$. Here ‘Z’ is