DSSSB PGT Chemistry Mock Test - 5 - DSSSB TGT/PGT/PRT MCQ

Months: Mar, Apr,  May,  June,  July,  Aug,  Sept, Oct
Odd days: 3,  2, 3,  2, 3, 3, 2, 3 
Total 21 odd days 
21/7 = 0
So, November will start with the same day.

Each letter has a different code as shown:

So, the code for STAGE will be 96371.

Cardiac muscles are striated, uninucleated, and branched. They are involuntary muscles responsible for the rhythmic contraction and relaxation of the heart.

Let their investments be Rs. x for 14 months, Rs. y for 8 months and Rs. z for 7 months respectively.
Then, 14x : 8y : 7z = 5 : 7 : 8.
Now,

'दही' एक पुल्लिंग शब्द है।
जिन शब्दो से पुरुष जाति का बोध होता है, पुल्लिंग कहलाता है। ग्रहों, देशों, द्रव्य पदार्थो, अनाजो, पर्वतो आदि के नाम पुल्लिंग में आते हैं। जैसे- सूर्य, भारत, लोहा, घी, दही, पीपल, आदि।
अतः सही विकल्प (A) है।

दैविक, सामाजिक तथा भौैमिक में 'इक' प्रत्यय लगा है।
नए शब्दों की रचना करने के क्रम में कुछ शब्दांशों को शब्दों के पीछे या उनके अंत में जोड़ दिया जाता है। इससे मूलशब्द के अर्थ में बदलाव या विशेषता आ जाती है। ये शब्दांश प्रत्यय कहलाते हैं।
अतः सही विकल्प (D) है।

प्रस्तुत गद्यांश के अनुसार, “शिक्षा से मनुष्य अपने परिवेश के प्रति जाग्रत होकर कर्तव्यविमुख हो जाता है। 'स्व' से 'पर' की ओर अग्रसर होने लगता है। निर्बल की सहायता करना, दुखियों के दु:ख दूर करने का प्रयास करना, दूसरों के दुःख से दु:खी हो जाना और दूसरों के सुख से स्वयं सुख का अनुभव करना जैसी बातें एक शिक्षित मानव में सरलता से देखने को मिल जाती हैं।”
शिक्षा से मनुष्य स्व' से 'पर' की ओर अभिगमन करने लगता है, क्योंकि उसमें कर्त्वयपरायणता का बोध जागृत होता है।
अतः सही विकल्प (C) है।

• An ionic compound is a giant structure of ions.
• The ions have a regular, repeating arrangement called an ionic lattice .
• The lattice is formed because the ions attract each other and form a regular pattern with oppositely charged ions next to each other.

(a) Ratio of r+ /r_ will decid e the type of unit cell 

For AX    hence, AX has bcc structure.

Thus, octahedral or square planar structure.

• An amorphous or non-crystalline solid is a solid that lacks the long-range order that is characteristic of a crystal.
• In brief, an amorphous solid is any noncrystalline solid in which the atoms and molecules are not organized in a definite lattice pattern. Such solids include glass, plastic, and gel.
• Quartz glass (SiO₂) is an amorphous solid due to its short range order of constituent particles. Note Quartz is a crystalline solid while quartz glass is an amorphous solid.

For the spectral line in H -atom and H -like species (one electron)

For Lyman series
For shortest wavelength (maximum wave number) n₂ → ∞



For longest wave length (minimum wave number), n₂ = (n₁, + 1).
For Balmer series, n₁ = 2

Preparation of Hydrogen from H₂O with Ca (Calcium)

• Hydrogen can be prepared from water (H₂O) through a chemical reaction with calcium (Ca).
• In this reaction, calcium acts as a reducing agent. This is because calcium has the ability to donate electrons during the reaction, which reduces the other reactant, in this case, water.
• The overall chemical reaction that occurs is: Ca + 2H₂O → Ca(OH)₂ + H₂
• In this reaction, calcium (Ca) reacts with water (H₂O) to form calcium hydroxide (Ca(OH)₂) and hydrogen gas (H₂).
• The hydrogen gas that is produced can be collected and used for various purposes.
• Thus, out of the given options, it is calcium that can act as a reducing agent to prepare hydrogen from water.

Why Other Options are Incorrect

• Ag (Silver) and Au (Gold) are noble metals and do not readily participate in chemical reactions. They cannot act as reducing agents to produce hydrogen from water.
• Al (Aluminium) can act as a reducing agent, but it does not react with water under normal conditions to produce hydrogen.

Conclusion

• Therefore, the correct answer is option B: 'Ca, which acts as reducing agent'.

0.5 mole of copper is dissolved from the anode. Thus, its mass decreases. 0.5 mole of copper from the anode is deposited at the cathode. Thus, its mass increases.
Thus, molar concentration of aqueous solution of CuSO₄ remains unchanged.

By Fajans' rule,
Smaller the size of cation, larger the size of anion. Larger the charge on cation or anion, larger the polarising power and thus, greater the covalent nature.
NaF, Na₂O, Na₃N, Na⁺ is same.

• John Newlands arranged the known elements in increasing order of their atomic masses.
• He started with the element having the lowest atomic mass ( hydrogen) and ended at thorium which was the 56th element.
• He found that every eighth element had properties similar to the first.

The periodic table is divided into four blocks that are called s, p, d, and f. Here is an explanation of each block: The s block makes up the first two columns of the periodic table. The elements in this block are all metals, and they react when water is present.

Permutit is hydrated sodium aluminum silicate, it exchanges it’s sodium ions for divalent ions of calcium and magnesium, permutit when fully exhausted can be regenerated by treating with 10% of sodium chloride solution. It is the most efficient method to get water with zero degrees of hardness.

The chemical name of bleaching powder is calcium hypochlorite.it is manufactured by the action of chlorine on slaked lime (Ca(OH).
2Ca(OH)₂+ 2Cl₂→CaOCl₂+ 2H₂O+CaCl₂

Phosphinic acid is a monoprotic acid as it contains one P−OH bond while phosphonic acid is a diprotic acid as it contains two P−OH bonds.

Presence of lone pairs on bonded atoms generally lowers the bond energy.
Bond energy order is
O—O (146) < (S—S) (266) < S—H(366) < O—H(464) kJ/mol
 

The correct order of bond dissociation enthalpy is

For O.S:

X + 0 + 2(-1) = 1

X = 3

Coordination number is the number of molecules linked to the central atom.

Hence B is the correct answer.

The correct answer is Option B.
The 1st option has R configuration and 2nd has S configuration hence they are non super imposable mirror images of each other and are enantiomers.

The gaseous byproducts escape out on its own continuously driving the reaction in forward direction.

α-carbon is achiral, hence retention of configuration at β-carbon.

Chloramphenicol treats typhoid, dysentery, acute fever, meningitis etc.,as it is Bacteriostatic and broad spectrum antibiotic.