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An element X (atomic number 12) reacts with another element Y (atomic number 17) to form a compound Z. Which of the following statements are true regarding this compound?

I. Molecular formula of Z is $X{Y}_2$

II. It is soluble in water

III. X and Y are joined by sharing of electrons

IV. It would conduct electricity in the molten state.

Which of the following acids is prepared by sulphuric acid industrially?

How would you convert :
(a) ethene into 1, 2-dibromoethane?
(b) ethene into ethyl bromide?

How to remember MODERN PERIODIC table very easily

with their atomic masses and atomic no.

Thank You

MEMON WASIQUE

Define conductor

Is water a salt?

As it is neither acid nor basic.

When metal X is treated with a dilute acid Y, then a gas Z is evolved which burns readily by making a little explosion.

(a) Name any two metals which can behave like metal X.

(b) Name any two acids which can behave like acid Y.

(c) Name the gas Z.

(d) Is the gas Z lighter than or heavier than air ?

(e) Is the reaction between metal X and dilute acid Y, exothermic or endothermic ?

(f) By taking a specific example of metal X and dilute acid Y,write a balanced chemical equation for the reaction which takes place. Also indicate physical states of all the reactants and products.

F, Cl and Br are the elements each having seven valence electrons. Which of these (i) has the largest atomic radius, (ii) is most reactive? Justify your answer stating reason for each.

Concentrated hydrochloric acid is added to manganese oxide to give metal chloride X, water and gas Y. Gas Y is greenish yellow having a sharp pungent choking odour. So, Y is:

A balloon is filled with hydrogen at room temperature. It will burst if the pressure exceeds 0.2 bar. If at 1 bar pressure the gas occupies 2.27 L volume. Up to what volume can the balloon be expanded?

The correct structure of 2- Methyl pentane is

Name the metals and non- metals

Fill in the following blanks with suitable words:
(a) Ultraviolet rays can cause skin............
(b) Pesticides enter the food chain at the ........... level

(c) $Grass\to ..............\to Human$
(d) $Lettuce\to ...................\to Fox$
(e) $Plants\to Antelope\to ................$

Balance the following chemical equation . (a). ZnS+O2-ZnO+SO2

One of the following is a micro-consumer. This one is:

(a) ant (b) lice (c) fungi (d) mosquito

Why do different books have diffrent order of the metals in the reactivity series ? What is the meaning of Li is more reactive than K . Also which is the most accurate order of metals in the reactivity series ?

Neutrons do not have charge but still they show......the property of tiny magnets....why?

When magnesium metal reacts with sulphuric acid it forms magnesium sulphate along with the evolution of hydrogen gas.

$Mg+H_{2}S{O}_4$$\to$$MgS{O}_4$+$H_2$

For experimental studies the conditions of the reaction was modified and rate of reaction was monitored. In which of the following case the occurance of the reaction is fastest?

Which of the following statement about modern periodic table is correct?

Amalgamation refers to

Which hydrocarbon is formed, when calcium carbide reacts with cold water?

State whether the following statement is true or false :
The minimum number of carbon atoms in a ketone molecule is two.

Name the reaction that is taking place in the beaker given below:

Explain ' Newland's law of Octaves.' Why was the law discarded?

The following question refers to the Periodic Table:

Which of the elements has the greatest affinity among the halogens?

Give reasons :
(a) Ethyne is more reactive than ethene.
(b) Ethene is more reactive than ethane.
(c) Hydrocarbons are excellent fuels.

The equation given below relate to the manufacture fo sodium carbonate (molecular weight of $N{a}_{2}C{O}_3=106$).
1. $NaCl+N{H}_3+C{O}_2+H_{2}O\to NaHC{O}_3+N{H}_{4}C$
2. $2NaHC{O}_3\to N{a}_{2}C{O}_3+H_{2}O+C{O}_2$
Equations (1) and (2) are based on the production of 21.2 g of sodium carbonate.
(a) What mass of sodium hydrogen carbonate must be heated to give 21.2 g of sodium carbonate?
(b) To produce the mass of sodium hydrogen carbonate calculated in (a) what volume of carbon dioxide, measured at STP, would be required?

You are provided with the following chemicals :

NaOH, $N{a}_{2}C{O}_3,H_{2}O,Zn(OH{)}_2,C{O}_2,HCI,Fe,H_2,S{O}_4,C{I}_2,Zn.$

Using the suitable chemicals from the given list only, state briefly how you would prepare :

(a) iron (III) chloride, (b) sodium sulphate,

(c) sodium zincate, (d) iron (II) sulphate,

(e) sodium chloride ?

Choose the incorrect statement in view of Mendeleev's Periodic Table

Which of the following is most similar to the actions of nineteenth-century ethnologists in their editing of the life stories of Native Americans?

The IUPAC name of the given compound is

While moving upwards in the lift, Nishant rolls a coin that covers $2\text{m}$ before coming to rest. How much does the coin travels with respect to Nishant from lift's frame of reference ?

The Zieglar-Natta catalysts are

Write the probable colour of the following salts:
(a) Ferrous salt

(b) Ammonium salt

(c) Cupric salt

(d) Calcium salts

(e) Aluminium salt

Question 8
If all the waste that we generate is biodegradable, will this have no impact on the environment?

List the observations that helps us to determine when a chemical reaction has taken place. [3 MARKS]

Which of the following statement is correct?

How does the resistance of graphite changes with temperature?

can all alkenes be used to ripe fruits or only ethene can be used?

Nitrogen (atomic number 7) and phosphorus (atomic number 15) belong to group 15 of the periodic table. Write the electronic configurations of these two elements. Which of these will be more electronegative? Why?