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Which of the following options is true for a redox reaction?

Choose the correct statements.

Why do we apply oil on iron tools kept in storage

Which of the following statement is false

X, Y and Z are three crystalline solids which are soluble in water and have a common anion.

To help you to identify X, Y and Z, you are provided with the following experimental observations. Copy and complete the corresponding inferences in (a) to (e).

(a) A reddish-brown gas is obtained when X, Y and Z are separately warmed with concentrated sulphuric acid and copper turning added to the mixture.

INFERENCE 1 : The common anion is the .................. ion.

(b) When X is heated, it melts and gives off only one gas which re-lights a glowing splint.

INFERENCE 2 : The cation in X is either ................ or ....................

(c) The action of heat on Y produces a reddish-brown gas and a yellow residue which fuses with the glass of the test tube.

INFERENCE 3 : The metal ion present in Y is the .................... ion.

(d) When Z is heated, it leaves no residue. Warming Z with sodium hydroxide solution liberates a gas which turns moist red litmus paper blue.

INFERENCE 4 : Z contans the ............ cation.

(e) Write the equations for the following reactions:

(1) X and concentrated sulphuric acid (below ${200}^{\circ }$). (One equation only for either of the cations given in INFERENCE 2).

(2) Action of heat on Y.

(3) Concentrated nitric acid is added to copper turnings kept in a beaker.

In a 'limiting reagent' problem, is it okay to ignore coefficients in the equation?

Explain how an electromotive force is developed in a Leclanche cell?

For non-zero value of force of attraction between gas molecules, gas equation will be :

The correct order of radii is

(a) Draw an electron dot diagram to show the structure of each of the following :

(i) Hydronium ion, (ii) Ammonium ion,

(iii) Hydroxyl ion

State the type of bonding present in them.

(b) Give two examples in each case :

(i) Co-ordinate bonds compounds,

(ii) Solid covalent compounds,

(iii) Gaseous polar compounds,

(iv) Gaseous non polar compounds,

(v) Liquid non polar compounds

What is displacement reaction? Write an example.

1. undefined
2. undefined
3. undefined
4. undefined

What are the different types of decomposition reactions

Gas A, which is the major cause of global warming, combines with hydrogen oxide B in nature in the precence of an environmental factor C and a green material D to form a six carbon organic compound E and a gas F. The gas F in necessary for breathing.

(a) What is gas A ?

(b) What is the common name of B ?

(c) What do you think could be C ?

(d) What is material D ? Where is it found ?

(e) Name the organic compound E.

(f) What is gas F ? Name the natural process during which it is released.

Find A and B in the following reaction.
$C{H}_{3}C{H}_{2}OH+O_2\to A+B+$ Heat and light

Tungsten is used in incandescent bulbs because of its _________.

In the first 20 elements Helium, Neon and Argon are very much inert. Can you predict about their ineptness seeing their electronic configuration.

Calculate the percentage of platinum in ammonium chloroplatinate, (NH₄)₂PtCl₆.

(Give your answer correct to the nearest whole number).

[N= 14,H= l,Pt= 195,C1 = 35.5]

Bee stings can be treated with :

(a) vinegar

(b) sodium hydrogencarbonate

(c) potassium hydroxide

(d) lemon juice

If you want to increase the rate of the reaction then:

Which of the following aqueous solutions will have highest $pH$?

The X and Y in the given equation respectively are :
$C{H}_{3}COO{C}_2{H}_6\stackrel{NaOH}{\to }X+Y$

What will be the expression of $t_{1/2}$ half -life when reaction follows rate law, $\text{rate}=k[\text{concentration}{]}^2$

Here,

$k$ is the rate constant

$a$ is the initial concentration of the reactant