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The functional group which always occurs in the middle of a carbon chain is :
(a) alcohol group (b) aldehyde group (c) carboxyl group (d) ketone group

What happens when sodium salt of ethanoic acid is heated with soda lime?

If a blue litmus paper remains blue after dipping into a solution, then that:

Identify the substance oxidized, substance reduced, oxidizing agent and reducing agent in the given reaction
$H_{2}S+B{r}_2\to 2HBr+S$

In circuit diagrams the resistors are connected to a battery of 12V and negligible internal resistance. Calculate energy provided by the cell in 2 minutes.

An acidic solution of $C{u}^{2+}$ salt containing 0.4 g of $C{u}^{2+}$ (CuSO₄) is electrolysed until all the Cu is deposited. The electrolysis is continued for seven more minutes with the volume of solution kept at 100 ml and the current at 1.2 Ampere. Calculate volume of gases evolved at N.T.P at anode during entire electrolysis.

Which one of the following is a correct food chain?

State one use each of the following non - metals:
Hydrogen, Carbon (as Graphite), Nitrogen, Sulphur

Sugar will not undergo decomposition on passing electricity through the aqueous solution.

Question 23
An electrolytic cell consists of:
(i) positively charged cathode.
(ii) negatively charged anode.
(iii) positively charged anode.
(iv) negatively charged cathode.

(a) (i) and (ii)
(b) (iii) and (iv)
(c) (i) and (iii)
(d) (ii) ad (iv)

A gas 'A' reacts with another gas 'B' in the presence of a catalyst to give a colourless gas 'C'. The gas 'C' when comes in contact with air produces a brown gas 'D'. The solution of 'A' in water turns red litmus blue. Explain the observations.

Which of the following belong to the same trophic level? Tree; Frog; Snake; Grass; Lizard

Explain why?
(a) The number of atoms in a certain volume of hydrogen is twice the number of atoms in the same volume of helium at the same temperature and pressure.
(b) When stating the volume of a gas, the pressure and temperature should also be given.
(c) Inflating a balloon seems to violate Boyle's law.

The formula for cyclopentane is ________.

Name the following:

(a) Two metals which give hydrogen with cold water.

(b) A metal which liberates hydrogen only when ste am is passed over red hot metal.

(c)The process in which oxygen is added or hydro gen is removed.

(d)A metallic oxide which can be reduced into metal by hydrogen.

What is the name of the above compound?

The decomposition produced by passing current through a conducting liquid is called :
(a) dialysis
(b) hydrolysis
(c) electrolysis
(d) electroplating

Solid calcium oxide was taken in a container and water was added slowly to it.
(i) State two observations made in the experiment.
(ii) Write the chemical formula of the product formed.

The rate of a chemical reaction is defined as a change in the concentration of reactants or products with respect to which of the following parameter?

Which group of elements were missing from the Mendeleev’s original periodic table?

When zinc reacts with dilute hydrochloric acid, zinc chloride is formed along with the evolution of gas X. The evolved gas is colourless, odourless and neutral to litmus. So, gas X is:

Four student (a), (b), (c) and (d) measured the pH values of water, lemon juice and sodium bicarbonate solution. What is the correct decreasing order of pH values?

In the extraction of silver, the recovery of silver from silver nitrate solution involves displacement by copper metal. Write down the respective reaction.

Biological magnification is highest in food consumed by:

If the empirical formula of the compound is CH and it has a bakery density of 13 find the molecular formula of the compound

(a) Select the correct answer.

A compound which during electrolysis in its molten state, liberates a reddish brown gas at the anode.

(i) Sodium chloride

(ii) Copper [II] oxide

(iii) Copper [II] sulphate

(iv) Lead [II] bromide

(b) During electroplating of an article with nickel,

(i) Name

A. The electrolyte

B. The cathode

C. The anode

(ii) Give the reaction of the electrolysis at

A. The cathode

B. The anode

(c) A, B and C are three electrolytic cells, connected in different circuits. Cell 'A' contains NaCl soln., and the bulb in the circuit glow brightly, when the circuit is completed. Cell 'B' contains acetic acid and the bulb does not glow. Give reason for each observation.

The hydrocarbons containing only carbon-carbon single bonds are known as

A substance has a pH value of 2. What kind of a substance is it?

Identify the type of reaction: HCl + NaOH → NaCl + H₂O

Element X reacts with chlorine to give XCl . X is most likely to be in the same period of the periodic table. What is X?

Carbon has the unique ability to form bonds with other atoms of carbon, giving rise to large molecules. What is this property of Carbon called as?

An iron knife kept in blue copper sulphate solution turns the blue solution into light green. Explain. [2 MARKS]

What happens when sulphuryl chloride dissolved in water?

(a) Explain, with example, how the physical states of the reactants and products can be shown in a chemical equation.

(b) Balance the following equation and add state symbols :

$Zn+HCl⟶ZnC{l}_2+H_2$

(c) Convey the following information in the form of a balanced equation :

"An aqueous solution of ferrous sulphate reacts with ans aqueous solution of sodium hydroxide to form aPrecipitate of ferrous hydroxide and sodium sulphate remains in solution."

Which of the following options are showing an oxidation reaction?