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Identify the type of reaction

The reaction mixture becomes warm

State an important use of decomposition reactions.

Which property of graphite is utilised in making electrodes?

The conversion of K₂Cr₂O₇ into Cr₂ (SO₄)₃ is a process of

The atomic mass of oxygen is 16u.

Considering the above statement, which among the following options can be inferred?

The precipitate formed when ammonium hydroxide is added to $FeC{l}_3$ is of :

Which one of the following bases is insoluble in water?

Name :

(a) a nitrate of metal which on heating does not give nitrogen dioxide.

(b) a nitrate which on heating leaves no residue behind.

(c) a metal nitrate which on heating is changed into metal oxide.

(d) a metal nitrate which on heating is changed into metal.

(e) a solution which absorbs nitric oxide.

(f) the oxide of nitrogen which turns brown on exposure to air. How is it prepared ?

Nonane is a hydrocarbon which is isomeric with 2-methyl-3-ethyl hexane.

The process in which the surface of the metals is cleaned by a chemical is called

An example of a reaction accompanied by colour change is:

The shape of $S{O}_4^{2-}$ ion is

Sico Ltd. took over the assets of Rs 4,80,000 and liabilities of Rs 80,000 of Mittal Ltd. for a consideration of Rs 3,20,000. Rs 20,000 were paid by an acceptance in favour of Mittal Ltd. payable after 3 months and the balance by issue of fully paid $8\%$ Preference Shares of Rs 100 each at a premium of $50\%$. Pass the necessary journal entries for the above transactions in the books of Sico Ltd.

Which of the following aqueous solutions is a good conductor of electricity?

Which of the following salt does not contain the water of crystallization?

(a) Name one ionic compound containing chlorine and one covalent compound containing chlorine.
(b) How will you find out which of the water-soluble compound A or B is ionic?

Q7. Consider the following statements about Micro plastics:

1. These pellets are made of polyethylene and polypropylene, and a few of them were unidentified polymers.

2. Micro plastics include things like films, fibers, fragments and pellets.

3. Due to the short residence time of micro plastics in the sea and on the beaches, they tend to adsorb various pollutants.

Which of the above statements are correct?

When sodium reacts with ethanol, which of the following gases is released?

What type of chemical reactions take place when :

(a) a magnesium wire is burnt in air ?

(b) lime-stone is heated ?

(c) silver bromide is exposed to sunlight ?

(d) electricity is passed through water ?

(e) ammonia and hydrogen chloride are mixed ?

(a) State the periodic law on which Mendeleev’s periodic table was based. Why and how was this periodic law changed?

(b) Explain why the noble gases are placed in a separate group.

Write a short note on the electronic nature of non-metals? [3 MARKS]

One litre of a gas at STP weight 1.16 g it can possible be

Match the column (for electrolytic refining of Cu):
$\begin{array}{cccc}& & & \\ & \text{Column-I}& & \text{Column-II}\\ \left(\text{a}\right)& \text{Anode}& \left(\text{p}\right)& \text{Thin sheets of pure Cu}\\ \left(\text{b}\right)& \text{Cathode}& \left(\text{q}\right)& \text{An aqueous solution of copper sulphate containing}{\text{H}}_2{\text{SO}}_4\\ \left(\text{c}\right)& \text{Electrolyte}& \left(\text{r}\right)& \text{Ag, Au}\\ \left(\text{d}\right)& \text{Anode mud}& \left(\text{s}\right)& \text{Impure metal of Cu}\end{array}$

Which metal occurs as:

(a) A sulphide, (b) a halide,

(c) a carbonate, (d) an oxide.

Also gives the names of their respective ores.

A sample of Urea $\left(C{H}_4{N}_{2}O\right)$ has $42.5\%$ N. What is the percentage purity of the sample?

Volume of air that will be expelled from a vessel of 300 ${cm}^3$ when it is heated from ${27}^{o}C$ to ${37}^{o}C$ at the same pressure will be

Covalent bond and ionic bond major difference and what are they

The use of one of the following will pollute the environment. This one is :

(a) paper carry bags

(b) cotton cloth carry bags

(c) nylon cloth carry bags

(d) jute carry bags

Explain giving one example, how highly reactive metals (which are high up in the reactivity series) are extracted.

${CO}_2+2NaOH\to H_{2}O+X:$

Identify X?

An element A has 2 electrons in its fourth shell.State:

(a) its atomic number

(b) its electronic configuration

(c) its valency

(d) position in the periodic table

(e) is it a metal or non-metal

(f) is it an oxidising or reducing agent.

Which of the following is not obtained on fractional distillation of petroleum?

Ammonia reacts with excess of chlorine to form a yellow coloured highly explosive liquid. Name this liquid.

write down the reduction and oxidation half reactions of the reaction: Na(s)+F(g),----->NaF

Substance which is reduced is reducing agent ....if yes or no why ...

Pls help me with detail explanation of reduction , oxidation reactions and redox reactions

(a) Why does the element carbon from a large number of carbon compounds?
(b) Write down the structures and names of two isomers of butane ($C_4{H}_{10}$)

Which among the following is the compound form of the simple sentence?
On being questioned, Raman confessed to the police.

Why homologous series of carbon compounds are so called? Write chemical formula of two consecutive members of a homologous series and state the part of these compounds that determines their (i) physical properties, and (ii) chemical properties

Among the following which is the best oxidizing agent?

Blue vitriol has

The number of atoms in one mole is $6\times {10}^{23}$. Then the number of sodium ions in 19.5 gm of sodium chloride will be? (If one mole of a substance is equal to gram molecular mass of the substance.)

How would you distinguish between Zn²⁺ and Pb²⁺ using ammonium hydroxide solution?

(a) Calculate the number of moles in 7 g of nitrogen.
(b) What is the volume at STP of 7.1 g of chlorine?
(c) What is the mass of 56 $c{m}^3$ of carbon monoxide at STP?

Give the principles of:

(a) hydrolytic method, (b) froth floatation,

(c) electromagnetic separation.