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The phrase
'agitation
of the hand' suggests
that the person is:

i.
Very ill

ii.
Very upset

iii.
Very angry

iv.
Very happy

__ law states that the physical and chemical properties of elements are periodic function of their atomic numbers.

The products obtained when 2-Methylpropene is oxidised with hot conc. acidic $KMn{O}_4$ are

Consider the give statements and select the correct option.

(i) Ammonium hydroxide reacts with lead nitrate to yield a chalky white precipitate

(ii) Ammonia is a colourless, basic gas lighter than air

The presence of HCl in the stomach causes ___ of enzymes.

Samples of the gases O₂, N₂, CO₂ and CO under the same conditions of temperature and pressure contain the same number of molecules represented by X. The molecules of oxygen [O₂], occupy V litres and have a mass of 8 g. Under the same conditions of temperature and pressure:

(a) What is the volume occupied by:

(i) X molecules of N₂?

(ii) 3X molecules of CO? [C = 12, N = 14, O = 16]

(b) What is the mass of CO₂ in g?

(c) In answering the above questions, which law have you used?

When a vegetable oil is treated with hydrogen in the presence of nickel (or palladium) catalyst, it forms a fat. This is an example of :
(a) anodising reaction (b) substitution reaction (c) displacement reaction (d) addition reaction

How many moles of Oxygen is required to completely burn one mole of methane?

State the sources of Alkanes.

During hydrogen bonding in ammonia molecule, nitrogen atom is bonded to:

Give scientific reasons for the following:

(1) Sodium is stored under kerosene.

(2) Gold and silver are used to make jewellery.

(3) Calcium floats over water during the reaction with water.

(4) Ionic compounds have high melting and boiling points.

(5) Tarnished copper utensils are cleaned with lime juice or tamarind.

Choose the molecule which exhibits polar character.

How We can say that noble gases have 8 electrons in its outer shell?

2 mL of ethanoic acid was taken in each of the 3 test tubes A, B and C. To these test tubes 2 mL, 4 mL and 8 mL of water was added respectively. Which test tube will give a clear solution?

The heat of hydrogenation of hexene is 127 K J/ mole .When a second double bond is introduced in the molecule, the heat of hydrgenation of the diene is found to be 23KJ / mole. The diene is most likely to be

Which of the following is an ore of mercury metal?
(a) rock salt (b) cinnabar (c) duralumin (d) zinc amalgam

On reacting NaHCO₃ and acetic acid, the gas evolved turns:

Question 7:

1. 
   

   Name a metal that catches fire when it reacts with water.

   
   


2. 
   

   Name a metal that slowly reacts with water.

   
   


3. 
   

   Why is phosphorus stored in the water?

   
   

Statement I: Lithium needs less energy to knock off an electron from its outermost orbit than Helium.
Statement II: Lithium has 1 electron in its outermost orbit which is loosely bonded to the nucleus, due to the repulsion of the electrons present in the inner orbit and located at a greater distance from the nucleus.

Which of the following metals on reaction with dilute hydrochloric acid will give salt and hydrogen gas?

Disposable plastic plates should not be used because

(a) they are made of lightweight materials.

(b) they are made of toxic materials.

(c) they are made of biodegradable materials.

(d) they are made of non-biodegradable materials.

For the reaction:

$A\left(g\right)+B\left(g\right)\to C\left(g\right)$

At STP 30 g of gas $A$ reacts with 11.2 L of gas B and produces gas C, which is diatomic. Calculate the number of atoms in C.

(Molar mass of A = 60 g/mol, $N_A$ is Avogadro's number )

For the identification of metallic ions such as iron and copper, sodium hydroxide should be added dropwise:

(a) What is the special feature of the structure of : (i) $C_2{H}_4$, (ii) $C_2{H}_2$?

(b) What type of reaction is common to both these compounds? Why methane does not undergo this type of reaction?

Complete the reaction
NaHCO₃ + CH₃COOH →

Salt is an example of :

Two closed bulbs of equal volume (V) containing an ideal gas initially at pressure $p_1$ and temperature $T_1$ are connected through a narrow tube of negligible volume as shown in the figure below. The temperature of one of the bulbs is then raised to $T_2$. The final pressure $p_f$ is: