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There are 4 test tubes A, B, C and D. The first test tube (A) dissolves NaCl but not Benzene. The second test tube (B) dissolves alcohol but not water. The third test tube (C) dissolves benzene but not NaCl and the fourth test tube (D) dissolves NaCl but not chloroform. Which of the following test tubes contains organic compound(s) ?

1. 10

Which of the following is a combination and which is a displacement reaction ?

(a) $C{l}_2+2KI⟶2KCI+I_2$

(b) $2K+C{I}_2⟶2KCI$

The first step for the extraction of metals in metallurgy is

What do you mean by Newland's law of octave?

How will we remember the relation of electronegativity between Ca & N , F & Mg which does not come either in the same!e period or in the same group

Select the correct answer from A, B , C and D.

A. Nitroso Iron[II] Sulphate

B. Iron [III] Chloride

C. Lead[II] Chloride

D. Sodium Chloride

Q1. A compound soluble in hot water but insoluble in cold water.

Q2. A compound which in the aq. soln. state, is neutral in nature.

Which of the following will give a pleasant smell of ester when heated with ethyl alcohol and a small quantity of sulphuric acid?

Which of the following is a strong base?

Question 8

Which among the following statement(s) is (are) true?

Exposure of silver chloride to sunlight for a long duration turns grey due to:

(i) the formation of silver by decomposition of silver chloride.
(ii) sublimation of silver chloride.
(iii) decomposition of chlorine gas from silver chloride.
(iv) oxidation of silver chloride.

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

Suppose we don't know that a onion is an indicator & and we add a few drops of litmus solution over it. What will happen in this case? Will there be any change?

An aqueous solution of ammonia is a_____.

Who developed the long form of periodic table

In Modern periodic table, Nitrogen is placed just before Oxygen in 2nd period because

Write a note on froth floatation?

A metal $X$ is known to make an oxide which reacts with both $HCl$ and $NaOH$. The metal reacts with steam to evolve Hydrogen gas. When the metal $X$ is reacted with Zinc Sulphate, it displaces $Zn$. Find $X$ and justify your answer by showing balanced reactions of processes mentioned in the question.

Which property of 'solder' alloy makes it suitable for welding electrical wires?

Name the simplest hydrocarbon.

Define the following terms :

(a) Allotropy

(b) Carat

(c) Crystal

(d) Catenation

Why generally Hydrogen gas is not evolved when metals react with dilute Nitric acid?

Liquor ammonia is formed as ammonia is ___________ in water.

Why are we using dilute acids for reaction? Why can't we use concentrated acids for reaction?

For ammonia, why is quicklime used as the drying agent?

Which of the following solutions containing weak acid and salt of its conjugate base has maximum buffer capacity?

The methane and steam are passed over a catalyst in the primary reformer. What is the catalyst made of?

Which of the following statement(s) is/are correct?

Solve this equation H3(Po4)+Ca(OH2)=HOH+Ca3(Po4) I want this method of balance

Can you please provide me with all important questions of chemical reactions and equations

Match Column I with Column II with reference to types of reaction:

$\begin{array}{cccc}& \text{Column I}& & \text{Column II}\\ \text{A.}& \text{Ionization}\text{reaction}& \text{p.}& {\text{CH}}_4+2{\text{O}}_2\to {\text{CO}}_2+2{\text{H}}_2\text{O}\\ \text{B.}& \text{Dissociation}\text{reaction}& \text{q.}& {\text{H}}_2{\text{O}}_2\to {\text{H}}_2\text{O}+{\text{O}}_2\\ \text{C.}& \text{Decomposition}\text{reaction}& \text{r.}& \text{Mg}{\text{Cl}}_2\to {\text{Mg}}^{2+}+2{\text{Cl}}^{-}\\ \text{D.}& \text{Combustion}\text{reaction}& \text{s.}& {{\text{H}}_2\text{O}}_{\left(\text{basic}\right)}+{{\text{H}}_2\text{O}}_{\left(\text{acidic}\right)}\to {\text{H}}_3{\text{O}}^{+}+{\text{OH}}^{-}\end{array}$

An element reacts with oxygen to give a compound with high melting point. This compound is also slightly soluble in water. The element is likely to be?

Is copper more reactive than hydrogen?

Then which elements are more reavtive than hydrogen and also copper?

Iron does not burn on heating but iron filings burn vigorously when sprinkled in the flame of the burner. Why?

If a hydrocarbon contains 2 carbons. Then how many different arrangement of carbon skeleton are possible:

Explain some of the objectives for the classification of elements in the periodic table.

Mass of He atom = ___ times one-twelfth the mass of C-12 atom

When an ammonium salt is warmed with sodium hydroxide solution, ammonia gas is evolved. State three ways in which you could identify this gas.

(a) A, B and C are the elements of a Dobereiner's triad.If the atomic mass of A is 7 and that of C is 39, what should be the atomic mass of B?

(b) Why was Dobereiner's triad discarded ?

In a mining field, miners found an ore called fool's gold whose chemical formula is ${\text{FeS}}_2$. Which method has to be carried out to convert concentrated ore to its oxide?

An ore of manganese metal is:
(a) bauxite (b) haematite (c) cuprite (d) pyrolusite

What is the correct match of the number of bonds along with their nomenclature?

1. Single-Bonded Carbon chain A. Word Root + ane

2. Double-Bonded Carbon chain B. Word Root + yne

3. Triple-Bonded Carbon chain C. Word Root + ene